ABSTRACT
Abstract
Provided are a communication method and system that combine the 5G communication system and the IoT technology to support a higher data rate after the 4G system. Based on the 5G communication technology and IoT technology, the disclosure can be applied to various intelligent services (e.g., smart home, smart building, smart city, smart or connected, car, healthcare, digital education, retail business, and security and safety service). The disclosure relates to a method and apparatus for terminating a cellular network connection to a terminal without authentication. The disclosure relates to a method and system for providing a vehicle communication service in the 3GPP system.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based on and claims priority under 35 U.S.C. 119(a) to Korean Patent Application No. 10-2018-0039902 filed on Apr. 5, 2018, Korean Patent Application No. 10-2018-0057774 filed on May 21, 2018, and Korean Patent Application No. 10-2018-0073423 filed on Jun. 26, 2018 in the Korean Intellectual Property Office, the disclosures of which are herein incorporated by reference in their entirety. The present application is related to U.S. application Ser. No. 16/377,043 filed Apr. 5, 2019 and entitled âMETHOD AND APPARATUS FOR SUPPORTING VEHICLE COMMUNICATIONS IN 5G SYSTEM,â which is incorporated by reference herein.
BACKGROUND
1. Field
The disclosure relates to a method for providing a vehicle communication (vehicle-to-everything, V2X) service in a 5G mobile communication system.
2. Description of Related Art
Since the commercial deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems to meet the ever increasing demand for wireless data traffic. As such, 5G or pre-5G communication systems are also called âbeyond 4G networkâ or âpost LTE systemâ.
To achieve higher data rates, 5G communication systems consider utilization of the mmWave band (e.g., 60 GHz band). To decrease path loss and increase the transmission distance in the mmWave band, various technologies including beamforming, massive multiple-input multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large scale antennas are considered for 5G communication systems.
To improve system networks in 5G communication systems, technology development is under way regarding evolved small cells, advanced small cells, cloud radio access networks (cloud RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving networks, cooperative communication, coordinated multi-points (CoMP), reception interference cancellation, and the like. In addition, advanced coding and modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), and advanced access technologies such as filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) are also under development for 5G communication systems.
The 5G system aims to support a wider variety of services than the existing 4G system. For example, the representative services may include enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), massive machine type communication (mMTC), and evolved multimedia broadcast/multicast service (eMBMS). The system providing the URLLC service may be referred to as a URLLC system, the system providing the eMBB service may be referred to as an eMBB system, or the like. The terms âserviceâ and âsystemâ may be used interchangeably.
Among them, the URLLC service is a newly considered service in the 5G system and, unlike the existing 4G system, requires satisfaction of extremely high reliability (e.g., packet error rate of about 10 â5 ) and low latency (e.g., about 0.5 msec) compared with other services. To satisfy such strict requirements, it may be necessary to apply a shorter transmission time interval (TTI) to the URLLC service in comparison to the eMBB service. Various techniques utilizing short TTIs are being considered.
Meanwhile, the Internet is evolving from a human centered network where humans create and consume information into the Internet of Things (IoT) where distributed elements or things process and exchange information. There has also emerged the Internet of Everything (IoE) technology that combines IoT technology with big data processing technology through connection with cloud servers. To realize IoT services, base technologies related to sensing, wired/wireless communication and network infrastructure, service interfacing, and security are needed, and technologies interconnecting things such as sensor networks, machine-to-machine (M2M) or machine type communication (MTC) are under development. In IoT environments, it is possible to provide intelligent Internet technology services, which collect and analyze data created by interconnected things to add new values to human life. Through convergence and combination between existing information technologies and various field technologies, IoT technology may be applied to various areas such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, health-care, smart consumer electronics, and advanced medical services.
Accordingly, various attempts are being made to apply 5G communication systems to IoT networks. For example, sensor networks and machine-to-machine or machine type communication are being realized by use of 5G communication technologies including beamforming, MIMO, and array antennas. Application of cloud RANs to big data processing described above may be an instance of convergence of 5G communication technology and IoT technology.
V2X (vehicle-to-everything) is a general term indicating all types of communication techniques applicable to road vehicles, and is being applied to various supplementary services in addition to the initial safety use case along with the development of wireless communication technology.
As a V2X service providing technology, WAVE (wireless access in vehicular environments) specifications have been standardized based on IEEE 802.11p and IEEE P1609. However, WAVE as a dedicated short range communication (DSRC) technology has a limitation in the message transmission range between vehicles.
To overcome such a limitation, the cellular-based V2X technology standard is underway in 3GPP. The LTE-based 4G V2X standard has been completed in Release 14, and the NR-based 5G V2X standard is underway in Release 16.
SUMMARY
Accordingly, the disclosure defines a 5G-based V2X system architecture. The disclosure also defines a V2X network slice structure for providing V2X services. In addition, the disclosure defines a method for providing provisioning information to a terminal for a V2X service in the 5G V2X system.
Aspects, features or objects of the disclosure are not limited to those described above. Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following description.
In accordance with an aspect of the present disclosure, a method of a terminal in a wireless communication system is provided. The method comprises receiving, from an access and mobility management function (AMF), mapping information regarding mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type; determining at least one RAT type corresponding to a V2X message to be transmitted, based on the mapping information; and transmitting the V2X message using the determined at least on RAT type.
In one embodiment, the transmitting the V2X message comprises: transmitting the V2X message using at least one of a long term evolution (LTE) RAT or a next generation (NR) RAT, in case that the determined at least on RAT type corresponding to the V2X message is the LTE RAT and the NR RAT.
In one embodiment, the receiving the mapping information comprises: transmitting, to the AMF, a registration request message; and receiving, from the AMF, a registration response message including the mapping information received from a policy control function (PCF) stored in a user data repository (UDR), in response to the registration request message.
In one embodiment, the determining the at least one RAT type is performed by a V2X layer of the terminal.
In one embodiment, the receiving the mapping information comprises: receiving, from the AMF, a user equipment (UE) configuration update message including the mapping information, in case that a UE policy update is triggered by a policy control function (PCF).
The present disclosure also provides a method of an access and mobility management function (AMF) in a wireless communication system. The method comprises receiving, from a policy control function (PCF), mapping information regarding mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type; and transmitting, to a terminal, the mapping information for the terminal to determine at least one RAT type corresponding to a V2X message to be transmitted and transmit the V2X message using the determined at least on RAT type.
In one embodiment, the receiving the mapping information comprises: receiving, from the terminal, a registration request message; transmitting, to the PCF, a policy request message; and receiving, from the PCF, a policy response message including the mapping information received from a user data repository (UDR), and the transmitting the mapping information comprises transmitting, to the terminal, a registration response message including the mapping information.
In one embodiment, the receiving the mapping information comprises receiving, from the PCF, a policy update message including the mapping information, in case that a UE policy update is triggered by a policy control function (PCF), and the transmitting the mapping information comprises transmitting, to the terminal, a user equipment (UE) configuration update message including the mapping information.
The present disclosure also provides a terminal comprising a transceiver; and a controller coupled with the transceiver and configured to: receive, from an access and mobility management function (AMF), mapping information regarding mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type, determine at least one RAT type corresponding to a V2X message to be transmitted, based on the mapping information, and transmit the V2X message using the determined at least on RAT type.
The present disclosure also provides an AMF comprising a transceiver; and a controller coupled with the transceiver and configured to: receive, from a policy control function (PCF), mapping information regarding mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type, and transmit, to a terminal, the mapping information for the terminal to determine at least one RAT type corresponding to a V2X message to be transmitted and transmit the V2X message using the determined at least on RAT type.
According to an embodiment of the disclosure, a vehicle terminal can utilize a vehicle communication service provided by the 5G V2X system. Here, the vehicle terminal may be a device embedded in the vehicle, or may be a terminal attached to the vehicle such as a smartphone or a dashboard camera.
According to an embodiment of the disclosure, the V2X application server (AS) provides the V2X service provisioning information to the terminal, making the roaming interface between the V2X control functions defined in the LTE V2X system unnecessary. In addition, the method of causing the V2X AS to provide the service provisioning information is applicable to other vertical services other than V2X.
According to an embodiment of the disclosure, by defining the V2X network slice, a third party service provider other than the mobile network operator can provide the V2X network slice. Here, examples of the third party service provider may include a vehicle manufacturer or a terminal manufacturer. Also, a third party service provider may rent the V2X network slice from the mobile network operator to utilize the V2X network slice. That is, the mobile network operator may install, operate, and manage the V2X network slice, and a third party service provider may rent the V2X network slice from the mobile network operator for utilization.
According to an embodiment of the disclosure, the V2X service provider (SP) can provide 5G-specific services.
Features or advantages of the disclosure are not limited to those described above. Other advantages and salient features of the disclosure will become apparent to those skilled in the art from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an example of a 5G-based V2X system architecture with service-based interfaces between the network functions according to an embodiment of the disclosure;
FIG. 2 illustrates shows an example of another 5G-based V2X system architecture with one-on-one reference points between the network functions according to an embodiment of the disclosure;
FIG. 3 depicts a procedure for providing V2X service parameters from the V2X AS to the terminal (UE) according to an embodiment of the disclosure;
FIG. 4 illustrates a structure in which the V2X AS is connected to plural mobile network operators according to an embodiment of the disclosure;
FIG. 5 illustrates a 5G network slice structure according to an embodiment of the disclosure;
FIG. 6 depicts a procedure for using a slice ID (S-NSSAI) when the terminal accesses a 3GPP network according to an embodiment of the disclosure;
FIG. 7 shows examples of S-NSSAIs indicating V2X service characteristics and V2X slices according to an embodiment of the disclosure;
FIG. 8 shows a structure diagram of 5G-based V2X slices according to an embodiment of the disclosure;
FIG. 9 shows an example of a mapping between V2X services and RAT types according to an embodiment of the disclosure;
FIG. 10 depicts a procedure for providing V2X service parameter information to the terminal according to an embodiment of the disclosure;
FIG. 11 depicts a procedure for the terminal to request and obtain V2X service parameter information from the V2X AS according to an embodiment of the disclosure;
FIGS. 12A to 12C depict examples of a plurality of procedures for a terminal to obtain V2X service parameter information during the registration process according to an embodiment of the disclosure;
FIG. 13 depicts a procedure for the V2X AS to obtain information on the terminal and V2X service from the network according to an embodiment of the disclosure;
FIG. 14 illustrates a method for the terminal to select an appropriate RAT type for a specific V2X application according to an embodiment of the disclosure;
FIG. 15 shows an example of a mapping between V2X services and frequency bands according to an embodiment of the disclosure;
FIG. 16 illustrates a protocol stack and operation of the V2X terminal according to an embodiment of the disclosure;
FIG. 17 illustrates a protocol stack and operation of the V2X terminal according to an embodiment
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based on and claims priority under 35 U.S.C. 119(a) to Korean Patent Application No. 10-2018-0039902 filed on Apr. 5, 2018, Korean Patent Application No. 10-2018-0057774 filed on May 21, 2018, and Korean Patent Application No. 10-2018-0073423 filed on Jun. 26, 2018 in the Korean Intellectual Property Office, the disclosures of which are herein incorporated by reference in their entirety. The present application is related to U.S. application Ser. No. 16/377,043 filed Apr. 5, 2019 and entitled âMETHOD AND APPARATUS FOR SUPPORTING VEHICLE COMMUNICATIONS IN 5G SYSTEM,â which is incorporated by reference herein.
BACKGROUND
1. Field
The disclosure relates to a method for providing a vehicle communication (vehicle-to-everything, V2X) service in a 5G mobile communication system.
2. Description of Related Art
Since the commercial deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems to meet the ever increasing demand for wireless data traffic. As such, 5G or pre-5G communication systems are also called âbeyond 4G networkâ or âpost LTE systemâ.
To achieve higher data rates, 5G communication systems consider utilization of the mmWave band (e.g., 60 GHz band). To decrease path loss and increase the transmission distance in the mmWave band, various technologies including beamforming, massive multiple-input multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large scale antennas are considered for 5G communication systems.
To improve system networks in 5G communication systems, technology development is under way regarding evolved small cells, advanced small cells, cloud radio access networks (cloud RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving networks, cooperative communication, coordinated multi-points (CoMP), reception interference cancellation, and the like. In addition, advanced coding and modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), and advanced access technologies such as filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) are also under development for 5G communication systems.
The 5G system aims to support a wider variety of services than the existing 4G system. For example, the representative services may include enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), massive machine type communication (mMTC), and evolved multimedia broadcast/multicast service (eMBMS). The system providing the URLLC service may be referred to as a URLLC system, the system providing the eMBB service may be referred to as an eMBB system, or the like. The terms âserviceâ and âsystemâ may be used interchangeably.
Among them, the URLLC service is a newly considered service in the 5G system and, unlike the existing 4G system, requires satisfaction of extremely high reliability (e.g., packet error rate of about 10 â5 ) and low latency (e.g., about 0.5 msec) compared with other services. To satisfy such strict requirements, it may be necessary to apply a shorter transmission time interval (TTI) to the URLLC service in comparison to the eMBB service. Various techniques utilizing short TTIs are being considered.
Meanwhile, the Internet is evolving from a human centered network where humans create and consume information into the Internet of Things (IoT) where distributed elements or things process and exchange information. There has also emerged the Internet of Everything (IoE) technology that combines IoT technology with big data processing technology through connection with cloud servers. To realize IoT services, base technologies related to sensing, wired/wireless communication and network infrastructure, service interfacing, and security are needed, and technologies interconnecting things such as sensor networks, machine-to-machine (M2M) or machine type communication (MTC) are under development. In IoT environments, it is possible to provide intelligent Internet technology services, which collect and analyze data created by interconnected things to add new values to human life. Through convergence and combination between existing information technologies and various field technologies, IoT technology may be applied to various areas such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, health-care, smart consumer electronics, and advanced medical services.
Accordingly, various attempts are being made to apply 5G communication systems to IoT networks. For example, sensor networks and machine-to-machine or machine type communication are being realized by use of 5G communication technologies including beamforming, MIMO, and array antennas. Application of cloud RANs to big data processing described above may be an instance of convergence of 5G communication technology and IoT technology.
V2X (vehicle-to-everything) is a general term indicating all types of communication techniques applicable to road vehicles, and is being applied to various supplementary services in addition to the initial safety use case along with the development of wireless communication technology.
As a V2X service providing technology, WAVE (wireless access in vehicular environments) specifications have been standardized based on IEEE 802.11p and IEEE P1609. However, WAVE as a dedicated short range communication (DSRC) technology has a limitation in the message transmission range between vehicles.
To overcome such a limitation, the cellular-based V2X technology standard is underway in 3GPP. The LTE-based 4G V2X standard has been completed in Release 14, and the NR-based 5G V2X standard is underway in Release 16.
SUMMARY
Accordingly, the disclosure defines a 5G-based V2X system architecture. The disclosure also defines a V2X network slice structure for providing V2X services. In addition, the disclosure defines a method for providing provisioning information to a terminal for a V2X service in the 5G V2X system.
Aspects, features or objects of the disclosure are not limited to those described above. Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following description.
In accordance with an aspect of the present disclosure, a method of a terminal in a wireless communication system is provided. The method comprises receiving, from an access and mobility management function (AMF), mapping information regarding mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type; determining at least one RAT type corresponding to a V2X message to be transmitted, based on the mapping information; and transmitting the V2X message using the determined at least on RAT type.
In one embodiment, the transmitting the V2X message comprises: transmitting the V2X message using at least one of a long term evolution (LTE) RAT or a next generation (NR) RAT, in case that the determined at least on RAT type corresponding to the V2X message is the LTE RAT and the NR RAT.
In one embodiment, the receiving the mapping information comprises: transmitting, to the AMF, a registration request message; and receiving, from the AMF, a registration response message including the mapping information received from a policy control function (PCF) stored in a user data repository (UDR), in response to the registration request message.
In one embodiment, the determining the at least one RAT type is performed by a V2X layer of the terminal.
In one embodiment, the receiving the mapping information comprises: receiving, from the AMF, a user equipment (UE) configuration update message including the mapping information, in case that a UE policy update is triggered by a policy control function (PCF).
The present disclosure also provides a method of an access and mobility management function (AMF) in a wireless communication system. The method comprises receiving, from a policy control function (PCF), mapping information regarding mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type; and transmitting, to a terminal, the mapping information for the terminal to determine at least one RAT type corresponding to a V2X message to be transmitted and transmit the V2X message using the determined at least on RAT type.
In one embodiment, the receiving the mapping information comprises: receiving, from the terminal, a registration request message; transmitting, to the PCF, a policy request message; and receiving, from the PCF, a policy response message including the mapping information received from a user data repository (UDR), and the transmitting the mapping information comprises transmitting, to the terminal, a registration response message including the mapping information.
In one embodiment, the receiving the mapping information comprises receiving, from the PCF, a policy update message including the mapping information, in case that a UE policy update is triggered by a policy control function (PCF), and the transmitting the mapping information comprises transmitting, to the terminal, a user equipment (UE) configuration update message including the mapping information.
The present disclosure also provides a terminal comprising a transceiver; and a controller coupled with the transceiver and configured to: receive, from an access and mobility management function (AMF), mapping information regarding mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type, determine at least one RAT type corresponding to a V2X message to be transmitted, based on the mapping information, and transmit the V2X message using the determined at least on RAT type.
The present disclosure also provides an AMF comprising a transceiver; and a controller coupled with the transceiver and configured to: receive, from a policy control function (PCF), mapping information regarding mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type, and transmit, to a terminal, the mapping information for the terminal to determine at least one RAT type corresponding to a V2X message to be transmitted and transmit the V2X message using the determined at least on RAT type.
According to an embodiment of the disclosure, a vehicle terminal can utilize a vehicle communication service provided by the 5G V2X system. Here, the vehicle terminal may be a device embedded in the vehicle, or may be a terminal attached to the vehicle such as a smartphone or a dashboard camera.
According to an embodiment of the disclosure, the V2X application server (AS) provides the V2X service provisioning information to the terminal, making the roaming interface between the V2X control functions defined in the LTE V2X system unnecessary. In addition, the method of causing the V2X AS to provide the service provisioning information is applicable to other vertical services other than V2X.
According to an embodiment of the disclosure, by defining the V2X network slice, a third party service provider other than the mobile network operator can provide the V2X network slice. Here, examples of the third party service provider may include a vehicle manufacturer or a terminal manufacturer. Also, a third party service provider may rent the V2X network slice from the mobile network operator to utilize the V2X network slice. That is, the mobile network operator may install, operate, and manage the V2X network slice, and a third party service provider may rent the V2X network slice from the mobile network operator for utilization.
According to an embodiment of the disclosure, the V2X service provider (SP) can provide 5G-specific services.
Features or advantages of the disclosure are not limited to those described above. Other advantages and salient features of the disclosure will become apparent to those skilled in the art from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an example of a 5G-based V2X system architecture with service-based interfaces between the network functions according to an embodiment of the disclosure;
FIG. 2 illustrates shows an example of another 5G-based V2X system architecture with one-on-one reference points between the network functions according to an embodiment of the disclosure;
FIG. 3 depicts a procedure for providing V2X service parameters from the V2X AS to the terminal (UE) according to an embodiment of the disclosure;
FIG. 4 illustrates a structure in which the V2X AS is connected to plural mobile network operators according to an embodiment of the disclosure;
FIG. 5 illustrates a 5G network slice structure according to an embodiment of the disclosure;
FIG. 6 depicts a procedure for using a slice ID (S-NSSAI) when the terminal accesses a 3GPP network according to an embodiment of the disclosure;
FIG. 7 shows examples of S-NSSAIs indicating V2X service characteristics and V2X slices according to an embodiment of the disclosure;
FIG. 8 shows a structure diagram of 5G-based V2X slices according to an embodiment of the disclosure;
FIG. 9 shows an example of a mapping between V2X services and RAT types according to an embodiment of the disclosure;
FIG. 10 depicts a procedure for providing V2X service parameter information to the terminal according to an embodiment of the disclosure;
FIG. 11 depicts a procedure for the terminal to request and obtain V2X service parameter information from the V2X AS according to an embodiment of the disclosure;
FIGS. 12A to 12C depict examples of a plurality of procedures for a terminal to obtain V2X service parameter information during the registration process according to an embodiment of the disclosure;
FIG. 13 depicts a procedure for the V2X AS to obtain information on the terminal and V2X service from the network according to an embodiment of the disclosure;
FIG. 14 illustrates a method for the terminal to select an appropriate RAT type for a specific V2X application according to an embodiment of the disclosure;
FIG. 15 shows an example of a mapping between V2X services and frequency bands according to an embodiment of the disclosure;
FIG. 16 illustrates a protocol stack and operation of the V2X terminal according to an embodiment of the disclosure;
FIG. 17 illustrates a protocol stack and operation of the V2X terminal according to an embodiment of the disclosure;
FIGS. 18A to 18C depict examples of a plurality of procedures for V2X group communication according to an embodiment of the disclosure;
FIG. 19 depicts a procedure for V2X service authentication according to an embodiment of the disclosure;
FIG. 20 illustrates information transferred from the source base station to the target base station when the terminal moves between base stations according to an embodiment of the disclosure;
FIG. 21 is a block diagram of a terminal according to the disclosure; and
FIG. 22 is a block diagram of a network entity according to the disclosure.
DETAILED DESCRIPTION
Hereinafter, embodiments and operations of the disclosure are described in detail with reference to the accompanying drawings. Descriptions of well-known functions and structures incorporated herein may be omitted to avoid obscuring the subject matter of the disclosure. The terms described below are defined in consideration of their functions in the disclosure, and these may vary depending on the intention of the user, the operator, or the custom. Hence, their meanings should be determined based on the overall contents of this specification.
In the following description, the terms for identifying or indicating access nodes, network entities, messages, interfaces between network entities, and various types of identification information are illustrated for ease of explanation. Hence, the disclosure is not limited to the following terms, and different terms referring to objects having equivalent technical meanings can be used.
In the description, the terms and names defined in the standards for the 5G system are used for ease of explanation. However, the disclosure is not limited by those terms and names, and can also be applied to systems conforming to other standards.
The following description of the embodiments is focused on 3GPP communication standards. However, it should be understood by those skilled in the art that the subject matter of the disclosure is applicable to other communication systems having similar technical backgrounds without significant modifications departing from the scope of the disclosure.
Embodiment A
FIG. 1 is a structure diagram of a 5G-based V2X system architecture with service-based interfaces between the network functions (NFs) according to an embodiment of the disclosure. FIG. 2 is a structure diagram of another 5G-based V2X system architecture with one-on-one reference points between the network functions according to an embodiment of the disclosure.
With reference to FIG. 1 , the V2X AS (application server) provides its services to other NFs via the Naf interface. The network exposure function (NEF) provides its services to other NFs via the Nnef interface. The PCF (policy control function) provides its services to other NFs via the Npcf interface.
FIG. 2 is a structure diagram of the 5G-based V2X system architecture shown in FIG. 1 with one-on-one reference points between the NFs. The NEF communicates with the V2X AS via the N33 reference point. The PCF communicates with the V2X AS via the N5 reference point.
FIGS. 1 and 2 show the same 5G-based V2X system architecture, which are schematically illustrated in different ways depending on the types of interfaces used between the NFs. In the following description, the interfaces shown in FIGS. 1 and 2 can be used together. The disclosure will be described based on FIG. 1 for ease of description, but the description of the disclosure is equally possible based on FIG. 2 .
In the following description, a âuser equipment (UE)â may be used interchangeably with a âterminalâ. In FIG. 1 , UE A and UE B represent a vehicle terminal, UE C represents a pedestrian terminal, and UE D represents a road side unit (RSU) being a stationary fixed terminal. Depending on the type of service being described, the (R)AN may be referred to as an access network (AN) to which a terminal accesses for a V2N service or to an RSU for a V2I service. Here, the vehicle terminal may be a device embedded in the vehicle, or a terminal attached to the vehicle such as a smartphone or a dashboard camera.
With reference to FIG. 1 , there may be a V2N (vehicle to network) service between the vehicle terminal (UE A) and the V2X application server (AS), a V2I (vehicle to infrastructure) service between the vehicle terminal (UE A) and the RSU (UE D), a V2V (vehicle to vehicle) service between the vehicle terminal (UE A) and the vehicle terminal (UE B), and a V2P (vehicle to pedestrian) service between the vehicle terminal (UE B) and the pedestrian terminal (UE C).
In FIG. 1 , terminals (UE A and UE D) are connected to the 3GPP network via the Uu reference point. Here, the (R)AN to which UE A and UE D are connected may refer to a 3GPP radio access network (RAN) or to a non-3GPP access network (AN) such as WiFi. That is, UE A and UE D may access the 3GPP network via a 3GPP RAN or a non-3GPP AN such as WiFi. UE A and UE D may connect to the 3GPP network via different (R)ANs.
With reference to FIG. 1 , terminals (UE B and UE C) can directly communicate with each other through the PC5 reference point (device-to-device (D2D) communication, or ProSe or PC5 communication) without being connected to the 3GPP network. In addition, UE A and UE D can access the 3GPP network through the Uu reference point and can directly communicate with another terminal through the PC5 reference point.
In one embodiment, UE A in FIG. 1 can communicate with the V2X AS via the V1 reference point to receive a V2N service. The V1 reference point is a logical reference point. For the actual data transmission between UE A and the V2X AS through the V1 reference point, the uplink data may be transmitted via the Uu reference point from UE A to the (R)AN, the N3 reference point from the (R)AN to the UPF, and the N6 reference point from the UPF to the data network, and the downlink data may be transmitted from the V2X AS to UE A over the reverse path.
In one embodiment, UE A in FIG. 1 may communicate with the (R)AN via the Uu reference point or may communicate with UE D being a fixed stationary terminal through the PC5 reference point to receive a V2I service. Here, the (R)AN and UE D may act as an RSU and provide a V2I service to UE A.
In one embodiment, UE A and UE B in FIG. 1 can communicate through the PC5 reference point to receive a V2V service.
In one embodiment, UE C and UE B in FIG. 1 can communicate through the PC5 reference point to receive a V2P service.
In one embodiment, the V2X AS in FIG. 1 can provide a V2X control function. The V2X control function may include a function of providing the terminal with parameter information necessary for the V2X service.
The V2X service parameters managed by the V2X AS may include at least one of authentication and/or authorization information, radio parameter information for receiving a V2X service when the terminal is located outside the network coverage, PC5 policy parameter information for providing a V2X service, or Uu policy parameter information for providing a V2X service.
The authentication information managed by the V2X AS may include information indicating whether the terminal has a capability to use a service provided by the V2X AS, information indicating the service available to the terminal among the services provided by the V2X AS in the case of the terminal being capable, information indicating whether the terminal can use a V2X service based on D2D communication (e.g., UE PC5 capability), information indicating whether the terminal can use a V2X service (e.g., UE Uu capability) based on multicast/broadcast communication (e.g., MBMS), information indicating whether the terminal can use a V2X service based on D2D communication outside the network coverage, and a list of mobile network operators (e.g., PLMN) capable of providing a V2X service to the terminal.
The information indicating the service available to the terminal among the services provided by the V2X AS may indicate whether the terminal can use a V2P service, whether the terminal can use a V2V service, whether the terminal can use a V2I service, whether the terminal can use a V2N service, or whether the terminal can use all the V2X services provided by the V2X AS. The information indicating the service available to the terminal among the services provided by the V2X AS may also indicate information on the service IDs available to the terminal among the service IDs (e.g., PSID or ITS-AID) mapped to the individual V2X services.
The radio parameter information for receiving a V2X service when the terminal managed by the V2X AS is located outside the network coverage may include information on the radio frequency and the region to use the radio frequency. When the terminal is located outside the network coverage, it can receive a V2X service by using the radio parameter information stored in advance.
The policy parameter information managed by the V2X AS for providing the V2X service may include at least one of a service ID (e.g., PSID or ITS-AID) indicating a V2X service and a corresponding destination layer-2 ID, packet priority information (e.g., ProSe per-packet priority (PPPP)) and corresponding packet delay budget information, a list of V2X services requiring privacy, a V2X service type (e.g., V2V, V2P, V2I or V2N) or V2X service ID (e.g., PSID or ITS-AID) and V2X frequency information needed to use the corresponding service, or V2X service type information (e.g., PSID or ITS-AID) that can use a specific PPPP or PPPR (ProSe per packet reliability). The terminal can transmit a V2X message through the PC5 reference point by setting the destination address to the destination layer-2 ID corresponding to the ID of a desired V2X service. The neighboring vehicle or RSU terminal having subscribed to the corresponding service can process the V2X message based on the destination layer-2 ID thereof. In addition, the terminal can transmit a V2X message whose packet priority corresponds to the required packet delay budget through the PC5 reference point. For example, in the case of an emergency V2X message, a small delay budget is required and a corresponding high priority value can be set in the emergency V2X message. In the case of a non-emergency message, a small delay budget is not required and a corresponding low priority value can be set in the corresponding V2X message.
In one embodiment, the V2X AS in FIG. 1 may provide the terminal with the V2X service parameters managed by it.
FIG. 3 depicts a procedure for the V2X AS to provide V2X service parameters to the terminal according to an embodiment of the disclosure.
With reference to FIG. 3 , in one embodiment, the V2X AS 301 may provide the V2X service parameters managed by it to the NEF 302 (step 310 ). Here, the communication between the V2X AS 301 and the NEF 302 may be performed via the Nnef service based interface shown in FIG. 1 or the N33 reference point shown in FIG. 2 .
In one embodiment, the NEF 302 may store the V2X service parameters received from the V2X AS 301 in the UDR (user data repository) 304 (
steps
320 , 325 , 330 and 335 ). Here, it is possible to use Option A in which the NEF 302 stores the V2X service parameters in the UDR 304 via the UDM (unified data management) 303 ( steps 320 and 325 ) and Option B in which the NEF 302 directly stores the V2X service parameters in the UDR 304 ( steps 330 and 335 ). In Option A, the communication between the NEF 302 and the UDM 303 may be performed using the Nudm service-based interface shown in FIG. 1 , and the communication between the UDM 303 and the UDR 304 may be performed via the Nudr service-based interface shown in FIG. 1 or via the N101 reference point shown in FIG. 2 . For example, the NEF 302 may transmit a message (e.g., Nudm_ParameterProvision_Update Request) containing the V2X service parameters received from the V2X AS 301 to the UDM 303 , and the UDM 303 may transmit a message (e.g., Nudr_DM_Update Request) containing the V2X service parameters received from the NEF 302 to the UDR 304 (step 320 ). Then, as a reply, the UDR 304 may transmit a response message (e.g., Nudr_DM_Update Response) to the UDM 303 , and the UDM 303 may transmit a response message (e.g., Nudm_ParameterProvision_Update Response) to the NEF 302 (step 325 ). In Option B, the communication between the NEF 302 and the UDR 304 may be performed via the Nudr service-based interface shown in FIG. 1 . For example, the NEF 302 may transmit a message (e.g., Nudr_DM_Update Request) containing the V2X service parameters received from the V2X AS 301 to the UDR 304 (step 330 ). Then, as a reply, the UDR 304 may transmit a response message (e.g., Nudr_DM_Update Response) to the NEF 302 (step 335 ).
In one embodiment, after storing the V2X service parameters in the UDR 304 , the NEF 302 can notify the V2X AS 301 of whether the parameter information is successfully updated (step 340 ).
In one embodiment, when the V2X service parameter information is updated in the UDR 304 , the UDR 304 can notify the PCF 305 of the updated information (step 345 ). To this end, the PCF 305 may request an event subscription to the UDR 304 in advance. The types of events requested by the PCF 305 to the UDR 304 may include updating the policy information of the V2X service, updating the terminal policy information related to the V2X service, updating the policy information of the terminal, and the like. Here, the communication between the UDR 304 and the PCF 305 may be performed via the Nudr service-based interface shown in FIG. 1 .
In one embodiment, upon receiving the updated V2X service parameter information of the terminal from the UDR 304 , the PCF 305 may determine whether to transmit the updated V2X service information to the terminal 307 (step 350 ).
In one embodiment, upon receiving the updated V2X service parameter information of the terminal 307 from the UDR 304 , the PCF 305 may process the corresponding information and store the processed information in the UDR 304 again (step 375 ).
In one embodiment, the PCF 305 may provide V2X service parameter information to the terminal 307 via the AMF (access and mobility management function) 306 ( steps 355 and 360 ). The V2X service parameter information may be information received by the PCF 305 from the UDR 304 at step 345 or may be a processed version of the information received by the PCF 305 from the UDR 304 at step 345 . Here, the communication between the PCF 305 and the AMF 306 may be performed via the Npcf service-based interface shown in FIG. 1 or the N15 reference point shown in FIG. 2 . The communication between the AMF 306 and the UE 307 may be performed via the N1 reference point shown in FIG. 1 . Here, the N1 reference point is a logical reference point, and the actual data can be transmitted to the terminal 307 via the N2 reference point and the Uu reference point.
In one embodiment, upon receiving the V2X service parameter information, the terminal 307 may store the received information and transmit a reply message indicating successful reception of the V2X service parameter information to the network (step 365 ). The AMF 306 may notify the PCF 305 that the V2X service parameter information has been successfully transmitted to the terminal 307 (step 370 ).
FIG. 4 illustrates a structure in which the V2X AS is connected to plural mobile network operators according to an embodiment of the disclosure.
One V2X AS can be connected to the NEFs of multiple PLMNs. The V2X AS can provide V2X service parameters to V2X service terminals (e.g., vehicle terminal, pedestrian terminal, and RSU) of each PLMN in a manner shown in FIG. 3 . Here, the V2X AS can manage common V2X service parameters and provide the same to the terminal independently of the PLMN to which the terminal has subscribed. Alternatively, the V2X AS may manage V2X service parameters for each PLMN to which the terminal has subscribed and provide the UE with the V2X service parameters corresponding to the PLMN to which the terminal has subscribed.
In one embodiment, the V2X AS provides the V2X service parameters to the terminal. Hence, the burden of managing the service parameter information can be reduced in the PLMN. In addition, the need for the roaming interfaces and associated procedures to support roaming terminals is reduced at the PLMN level. That is, to support roaming terminals, the V2X AS can provide relevant service parameter information to the terminal.
In one embodiment, the V2X AS can provision the V2X service parameter information to the terminal through the 3GPP NEF. The disclosure is not limited to the V2X service and is applicable to other services provided through the 3GPP network. For example, in the case of an IoT service, the IoT AS providing IoT services can provide a terminal with the parameter information to be provisioned to the terminal through the NEF. In the case of a smart factory service, the smart factory AS providing smart factory services can provide a terminal with the parameter information to be provisioned to the terminal through the NEF. In the case of a multicast broadcast service, the multicast broadcast AS providing multicast broadcast services can provide a terminal with the parameter information to be provisioned to the terminal through the NEF. Additionally, in the case of a public safety service, the MCPTT AS providing mission critical services can provide a terminal with the parameter information to be provisioned to the terminal through the NEF. That is, the method of delivering the information needed by a terminal for service provisioning to the terminal through the NEF is not limited to a specific service but can be applied to all the services.
Embodiment B
The terms âsliceâ, âserviceâ, ânetwork sliceâ, ânetwork serviceâ, âapplication sliceâ, and âapplication serviceâ may be used interchangeably in describing the embodiments of the disclosure.
The mobile network operator can allocate suitable network resources to a service for each slice or a set of slices. Here, the network resource may indicate a specific NF or a logical resource or radio resource provided by the NF.
FIG. 5 illustrates a 5G network slice structure according to an embodiment of the disclosure.
The PLMN may provide multiple network slices, and each network slice may be provided to the terminal in the form of a slice instance. The terminal can connect to the network and receive services from several slice instances at the same time. Each slice instance can be composed of the network resources needed to provide the corresponding network slice.
For example, slice instance 1 is composed of the SMF (session management function) and the UPF (user plane function), and slice instance 2 is composed of the SMF, the UPF, and the PCF. In FIG. 5 , the SMF of slice instance 2 may have an association with the PCF at the PLMN level and the PCF at the slice level. The PCF at the PLMN level can provide the policy information of the corresponding PLMN to the SMF. The slice-level PCF belonging to slice instance 2 may manage the policies necessary to provide the corresponding slice and may provide the corresponding information to the SMF.
Each slice can be identified by a slice ID. An example of the slice ID may be the S-NSSAI (single-network slice selection assistance information) defined by 3GPP.
FIG. 6 depicts a procedure for using a slice ID when the terminal accesses a 3GPP network according to an embodiment of the disclosure.
With reference to FIG. 6 , the terminal 610 transmits a registration request message to the AMF 615 via the AN 613 to access the network ( steps 620 and 630 ). At this time, the terminal 610 may include the desired slice information (requested NSSAI) in the registration request message. The requested NSSAI may include a list of S-NSSAIs. That is, the terminal 610 wishing to use a V2X service can send the AMF 615 the requested NSSAI including the S-NSSAI indicating the V2X slice by use of a registration request message. Upon receiving the registration request message, the AMF 615 determines whether the terminal 610 is allowed to use the requested slice (requested NSSAI) and transmits a registration accept message containing information on the slice available to the terminal (allowed NSSAI) to the terminal 610 (step 640 ).
FIG. 7 shows examples of S-NSSAIs indicating V2X service characteristics and V2X slices according to an embodiment of the disclosure.
With reference to FIG. 7 , the slice/service type (SST) for providing a V2X service can be V2X, V2N, V2I, V2V, V2P, or the like. The V2X SST values can represent vehicle communication services including V2N, V2I, V2V and V2P services. Vehicle communication services defined by standardization bodies other than 3GPP (e.g., DSRC, WAVE, and ITS) can also be identified by the SST values. As described above, the SST for providing the V2X services can be applied to various vehicle communication services without being limited to the services described in the disclosure.
In FIG. 7 , the SST for each V2X service may have its own SST value. One S-NSSAI for a V2X service is composed of an SST value and an SD (slice differentiator) value. The SST value of an S-NSSAI refers to a V2X service, and the SD value thereof can refer to additional information other than the V2X service. In one embodiment, the SD value may indicate a vehicle manufacturer (e.g., BMW, Audi, Hyundai, or Toyota), a terminal manufacturer (e.g., Samsung, or Apple), a V2X service provider, or a mobile network operator (e.g., SKT, KT, AT&T, or Deutsche Telekom). The SD value is optional and may be not included in the S-NSSAI.
In one embodiment, when a terminal (e.g., vehicle terminal, pedestrian terminal, or RSU) using a V2X service accesses the 3GPP network, it can transmit a registration request message containing a desired V2X slice ID (i.e., S-NSSAI indicating a desired V2X slice). This process is depicted in FIG. 6 . An S-NSSAI indicating a V2X slice included in the registration request message is illustrated in FIG. 7 . For example, a Toyota vehicle terminal having subscribed to the V2N service and the V2V service may include the following requested slice information (requested NSSAI) in the registration request message.
Requested NSSAI: {(V2X, Toyota)}
In the above example, the V2X service may be a service for a Toyota vehicle, and the SST value is âV2Xâ and the SD value is âToyotaâ being a vehicle manufacturer. The requested slice information may include S-NSSAIs for V2V and V2N services instead of the S-NSSAI for a V2X service.
Requested NSSAI: {(V2N, Toyota), (V2V, -)}
In the above example, the V2X slice may be a service for a Toyota vehicle, and the SST value is âV2Nâ and the SD value is âToyotaâ being a vehicle manufacturer. Also, in the above example, the V2V slice may be provided regardless of the terminal type, and the SST value may be âV2Vâ and the SD value may be not included. Upon receiving the requested slice (requested NSSAI) information from the terminal, the AMF determines whether the slice requested by the terminal is available and may transmit the terminal a registration accept message containing information on the slice available to the terminal (allowed NSSAI). The allowed NSSAI may have the same value as the requested NSSAI.
In one embodiment, the SST value or SD value constituting the S-NSSAI can be used only in the NF of the PLMN that has defined the S-NSSAI. That is, the NF of the PLMN that has not defined the S-NSSAI may be unable to interpret the SST value or the SD value of the S-NSSAI. To use the LTE or 5G V2X service, a V2X terminal must subscribe to a PLMN that can provide the V2X service. The PLMN to which the terminal has subscribed may be referred to as the home PLMN (HPLMN). The HPLMN provides the S-NSSAI value for the V2X slice to the V2X terminal. When the V2X terminal connects to the network, it transmits a registration request message containing the S-NSSAI value received from the HPLMN to the AMF. Because the AMF is the NF of the HPLMN having allocated the S-NSSAI, the AMF can interpret the SST and SD values included in the S-NSSAI and select the V2X slice corresponding to the SST and SD values. In one embodiment, when the V2X terminal roams into the VPLMN (visited PLMN), the V2X terminal can transmit a registration request message including the S-NSSAI provided by, the HPLMN to the AMF of the VPLMN. Because the AMF having received the registration request message is the NF of the VPLMN, it may be unable to interpret the SST value or the SD value included in the S-NSSAI received from the terminal. If the AMF cannot interpret both the SST value and the SD value, the S-NSSAI requested by the terminal may be rejected and the S-NSSAI may be not included in the allowed NSSAI contained in the registration accept message. If the AMF can interpret the SST value only and cannot interpret the SD value, the AMF may select a V2X slice corresponding to the SST value while ignoring the SD value and provide the selected V2X slice to the terminal.
FIG. 8 shows a structure diagram of 5G-based V2X slices according to an embodiment of the disclosure.
In one embodiment, with reference to FIG. 8 , the V2N slice may include a vehicle terminal (UE A) using a V2N service, an access network ((R)AN) to which the terminal is connected, 3GPP 5G core network functions (AMF, SMF and UPF), and the V2X AS. The V2I slice can include a vehicle terminal (UE A), an RSU terminal (UE D), and the (R)AN. The V2V slice may include vehicle terminals (UE A and UE B) that utilize the V2V service based on D2D communication. The V2P slice may include a vehicle terminal (UE A) and a pedestrian terminal (UE B).
Embodiment C
A V2X terminal conforming to the 3GPP standards may support a radio access technology (RAT) for D2D communication. The RAT types may include LTE (Long Term Evolution) and NR (New Radio), and may further include a RAT type to be defined by 3GPP in the future and a wireless network technology (e.g., WiFi) defined by a standardization body other than 3GPP. When a terminal supporting a plurality of RATs for D2D communication sends a V2X message, it is necessary for the terminal to select the most appropriate RAT for the corresponding V2X application.
In one embodiment, the V2X AS can select the appropriate RAT for each of the V2X services provided by the V2X AS. The V2X AS can manage information on the V2X services and associated RATs.
FIG. 9 shows an example of a mapping between V2X services managed by the V2X AS and RAT types a
CLAIMS
Claims ( 12 )
What is claimed is:
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from an access and mobility management function (AMF), a user equipment (UE) configuration update message including mapping information received from a policy control function (PCF) based on a UE policy update being triggered by the PCF, the mapping information for mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type;
selecting at least one RAT type corresponding to a V2X message to be transmitted, based on the mapping information; and
transmitting the V2X message using the selected at least one RAT type,
wherein the selecting the at least one RAT type is performed by a V2X layer of the terminal.
2. The method of claim 1 , wherein the transmitting the V2X message comprises:
transmitting the V2X message using at least one of a long term evolution (LTE) RAT or a next generation (NR) RAT, in case that the selected at least one RAT type corresponding to the V2X message is the LTE RAT and the NR RAT.
3. The method of claim 1 , wherein the receiving the mapping information comprises:
transmitting, to the AMF, a request message; and
receiving, from the AMF, a response message including the mapping information received from the PCF stored in a user data repository (UDR), as a response to the request message.
4. A method performed by an access and mobility management function (AMF) in a wireless communication system, the method comprising:
receiving, from a policy control function (PCF), a user equipment (UE) configuration update message including mapping information based on a UE policy update being triggered by the PCF, the mapping information for mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type; and
transmitting, to a terminal, the mapping information for the terminal to select at least one RAT type corresponding to a V2X message to be transmitted and to transmit the V2X message using the selected at least one RAT type,
wherein the at least one RAT type is selected by a V2X layer of the terminal.
5. The method of claim 4 , wherein the receiving the mapping information comprises:
receiving, from the terminal, a request message;
transmitting, to the PCF, a policy request message; and
receiving, from the PCF, a policy response message including the mapping information received from a user data repository (UDR),
wherein the transmitting the mapping information comprises transmitting, to the terminal, a response message including the mapping information.
6. The method of claim 4 ,
wherein the transmitting the mapping information comprises transmitting, to the terminal, the UE configuration update message including the mapping information.
7. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a controller configured to:
receive, from an access and mobility management function (AMF) via the transceiver, a user equipment (UE) configuration update message including mapping information received from a policy control function (PCF) based on a UE policy update being triggered by the PCF, the mapping information for mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type,
select at least one RAT type corresponding to a V2X message to be transmitted, based on the mapping information, and
transmit, via the transceiver, the V2X message using the selected at least one RAT type,
wherein the at least one RAT type is selected by a V2X layer of the terminal.
8. The terminal of claim 7 , wherein the controller is configured to transmit, via the transceiver, the V2X message using at least one of a long term evolution (LTE) RAT or a next generation (NR) RAT, in case that the selected at least one RAT type corresponding to the V2X message is the LTE RAT and the NR RAT.
9. The terminal of claim 7 , wherein the controller is configured to:
transmit, to the AMF via the transceiver, a request message, and receive, from the AMF, a response message including the mapping information received from the PCF stored in a user data repository (UDR), as a response to the request message.
10. An access and mobility management function (AMF) in a wireless communication system, the AMF comprising:
a transceiver; and
a controller configured to:
receive, from a policy control function (PCF) via the transceiver, a user equipment (UE) configuration update message including mapping information based on a UE policy update being triggered by the PCF, the mapping information for mapping between at least one vehicle to everything (V2X) service type and at least one radio access technology (RAT) type, and
transmit, to a terminal via the transceiver, the mapping information for the terminal to select at least one RAT type corresponding to a V2X message to be transmitted and to transmit the V2X message using the selected at least one RAT type,
wherein the at least one RAT type is selected by a V2X layer of the terminal.
11. The AMF of claim 10 , wherein the controller is configured to receive, from the terminal via the transceiver, a request message, transmit, to the PCF, a policy request message, and receive, from the PCF, a policy response message including the mapping information received from a user data repository (UDR), and
wherein the controller is configured to transmit, to the terminal via the transceiver, a response message including the mapping information.
12. The AMF of claim 10 ,
wherein the controller is configured to transmit, to the terminal via the transceiver, the UE configuration update message including the mapping information.
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