CN118176752A - Method and apparatus for providing relay in wireless communication system - Google Patents
Method and apparatus for providing relay in wireless communication system Download PDFInfo
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- CN118176752A CN118176752A CN202280073336.3A CN202280073336A CN118176752A CN 118176752 A CN118176752 A CN 118176752A CN 202280073336 A CN202280073336 A CN 202280073336A CN 118176752 A CN118176752 A CN 118176752A
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Abstract
The present disclosure relates to a method of operating a terminal in a wireless communication system, wherein the method may include the steps of: receiving, by the relay terminal, an advertisement request message requesting an advertisement of a Tracking Area Identity (TAI) from a first remote terminal; transmitting, by the relay terminal, an announcement response message as an acknowledgement response to the first remote terminal; and advertising a message including a TAI of a serving cell of the relay terminal based on the advertisement request message. Here, when one or more different remote terminals other than the first remote terminal are connected to the relay terminal, the relay terminal may transmit a message including the TAI of the serving cell of the relay terminal one or more times.
Description
Technical Field
The following description relates to wireless communication systems and methods and apparatus for providing relay. And in particular to a method and apparatus for transmitting a message including a Tracking Area Identity (TAI) to a remote terminal (UE).
Background
Wireless communication systems have been widely deployed to provide various types of communication services such as voice or data. In general, a wireless communication system is a multiple access system supporting communication for multiple users by sharing available system resources (bandwidth, transmit power, etc.). Examples of multiple-access systems include Code Division Multiple Access (CDMA) systems, frequency Division Multiple Access (FDMA) systems, time Division Multiple Access (TDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, and single carrier frequency division multiple access (SC-FDMA) systems.
In particular, because a large number of communication devices require a large communication capacity, enhanced mobile broadband (eMBB) communication technologies are being proposed as compared to conventional Radio Access Technologies (RATs). In addition, not only large-scale machine type communication (large-scale MTC) that provides various services by connecting a plurality of devices and objects anytime and anywhere, but also a communication system of a service/user terminal equipment (UE) in consideration of sensitivity to reliability and delay is being proposed. Various technical arrangements are proposed for this purpose.
Disclosure of Invention
Technical problem
The present disclosure relates to a method and apparatus for providing relay in a wireless communication system.
The present disclosure relates to a method and apparatus for transmitting a message including a Tracking Area Identity (TAI) to a remote terminal (UE) in a wireless communication system.
The present disclosure relates to a method and apparatus for transmitting a relay discovery additional information message including a TAI at a relay UE in a wireless communication system.
The present disclosure relates to a method and apparatus for transmitting a message including a TAI to a remote UE that has not requested the TAI in a wireless communication system.
Technical objects to be achieved by the present disclosure are not limited to the above-mentioned ones, and those skilled in the art to which the technical configuration of the present disclosure is applied can consider other technical objects not mentioned herein from the embodiments of the present disclosure to be described below.
Technical proposal
As an example of the present disclosure, a method of operating a terminal in a wireless communication system may include: the relay terminal receives an announcement request message requesting announcement of a Tracking Area Identity (TAI) from a first remote terminal, the relay terminal transmits an announcement response message as an acknowledgement response to the first remote terminal, and announces a message including the TAI of a serving cell of the relay terminal based on the announcement request message. The relay terminal may send a message including the TAI of the serving cell of the relay terminal one or more times based on one or more other remote terminals other than the first remote terminal being connected to the relay terminal.
In addition, as an example of the present disclosure, a relay terminal operating in a wireless communication system may include: at least one transceiver; at least one processor; and at least one memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform particular operations. The specific operations may include: controlling the at least one transceiver to receive an announcement request message from a first remote terminal requesting an announcement of a Tracking Area Identity (TAI); controlling the at least one transceiver to cause the relay terminal to send an announcement response message as an acknowledgement response to the first remote terminal; and controlling the at least one transceiver to announce a message including a TAI of a serving cell of the relay terminal based on the announcement request message. The relay terminal transmits a message including the TAI of the serving cell of the relay terminal one or more times based on one or more other remote terminals other than the first remote terminal being connected to the relay terminal.
In addition, as an example of the present disclosure, a method of operating a terminal in a wireless communication system may include: the remote terminal transmits an announcement request message requesting announcement of a Tracking Area Identifier (TAI) to the relay terminal; the remote terminal receiving an announcement response message from the relay terminal as an acknowledgement response; and receiving a message including a TAI of a serving cell of the relay terminal from the relay terminal based on the advertisement request message. The relay terminal may send a message including the TAI of the serving cell of the relay terminal one or more times based on one or more other remote terminals other than the first remote terminal being connected to the relay terminal.
In addition, as an example of the present disclosure, a terminal operating in a wireless communication system may include: at least one transceiver; at least one processor; and at least one memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform particular operations. The specific operations may include: controlling the at least one transceiver to transmit an announcement request message requesting an announcement of a Tracking Area Identifier (TAI) to a relay terminal; controlling the at least one transceiver to cause the remote terminal to receive an announcement response message from the relay terminal as an acknowledgement response; and controlling the at least one transceiver to receive a message including a TAI of a serving cell of the relay terminal from the relay terminal based on the advertisement request message. The relay terminal may send a message including the TAI of the serving cell of the relay terminal one or more times based on one or more other remote terminals other than the first remote terminal being connected to the relay terminal.
Additionally, as an example of the present disclosure, an apparatus may include at least one memory and at least one processor functionally connected to the at least one memory. The at least one processor may control the device to: receiving an advertisement request message requesting an advertisement of a Tracking Area Identity (TAI) from another device; sending an announcement response message as an acknowledgement response to the other device; and advertising a message including a TAI of a serving cell of the device based on the advertisement request message. Based on one or more other devices other than the device being connected to the device, the device may send a message including the TAI of the serving cell of the device one or more times.
Additionally, as an example of the present disclosure, a non-transitory computer-readable medium storing at least one instruction may include the at least one instruction executable by a processor. The at least one instruction may control the device to: receiving an advertisement request message requesting an advertisement of a Tracking Area Identity (TAI) from another device; sending an announcement response message as an acknowledgement response to the other device; and advertising a message including a TAI of a serving cell of the device based on the advertisement request message. Based on one or more other devices other than the device being connected to the device, the device may send a message including the TAI of the serving cell of the device one or more times.
In addition, the following matters can be generally applied.
As an example of the present disclosure, the message of the TAI including the serving cell of the relay terminal may be transmitted one or more times based on one or more other remote terminals except the first remote terminal being connected to the relay terminal and the one or more connected remote terminals except the first remote terminal not transmitting a message requesting notification of the TAI.
In addition, as an example of the present disclosure, the relay terminal may transmit the message including the TAI of the serving cell of the relay terminal based on an implementation of the relay terminal.
In addition, as an example of the present disclosure, the request for the TAI of the serving cell of the relay terminal may be made based on an additional parameter advertisement procedure, the advertisement request message requesting the advertisement of the TAI may be an additional parameter advertisement request message, the advertisement response message may be an additional parameter advertisement response message, and the message including the TAI of the serving cell of the relay terminal may be a relay discovery additional information message.
In addition, as an example of the present disclosure, the relay terminal may repeatedly transmit the relay discovery additional information message based on a preset period while an additional parameter advertisement request refresh timer is operated in the relay terminal.
In addition, as an example of the present disclosure, the relay terminal may transmit the new additional parameter or the updated additional parameter through the relay discovery additional information message based on the relay terminal detecting the new additional parameter or the update of the additional parameter.
Further, as an example of the present disclosure, the first remote terminal may request an announcement of an additional parameter from the relay terminal based on the additional parameter announcement request message, and the additional parameter may include at least one of the TAI of the serving cell of the relay terminal or an NR Cell Global Identifier (NCGI) of the serving cell of the relay terminal.
In addition, as an example of the present disclosure, the relay terminal may receive the additional parameter advertisement request message from the first remote terminal, the additional parameter advertisement request message including one-time (one-time) advertisement indication information indicating that the relay terminal only advertises the additional parameter once; and the relay terminal may advertise the additional parameter only once based on the one-time advertisement indication information.
In addition, as an example of the present disclosure, even if the one-time announcement indication information indicates that the additional parameter is announced only once, the relay terminal may transmit the additional parameter one or more times based on one or more other remote terminals other than the first remote terminal being connected to the relay terminal.
In addition, as an example of the present disclosure, the one-time announcement indication information may be set in the TAI of the serving cell of the relay terminal and the NCGI of the serving cell of the relay terminal, respectively.
In addition, as an example of the present disclosure, the relay terminal may perform relay of the first remote terminal through a non-3 GPP interworking function (N3 IWF), and the first remote terminal may select the N3IWF based on the TAI of the serving cell of the relay terminal.
In addition, as an example of the present disclosure, based on the advertisement request message, the message including the TAI of the serving cell of the relay terminal may be transmitted in a broadcast form based on a default destination layer 2ID set to be used when transmitting a PC5 discovery message.
Advantageous effects
The present disclosure may provide relaying in a wireless communication system.
The present disclosure may transmit a message including a Tracking Area Identity (TAI) to a remote UE in a wireless communication system.
In the present disclosure, a relay UE may transmit a relay discovery additional information message including a TAI in a wireless communication system.
The present disclosure has the effect of saving resources and time by transmitting a message including a TAI to a remote UE that has not requested the TAI in a wireless communication system.
The effects obtained in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly derived and understood by those skilled in the art to which the technical configuration of the present disclosure is applied from the following description of the embodiments of the present disclosure. That is, those skilled in the art can also derive effects from the embodiments of the present disclosure that are not expected when implementing the configurations described in the present disclosure.
Drawings
The accompanying drawings are provided to aid in the understanding of the disclosure, and embodiments of the disclosure may be provided along with the detailed description. However, technical features of the present disclosure are not limited to the specific drawings, and features disclosed in each drawing may be combined with each other to constitute a new embodiment. Reference numerals in each drawing may refer to structural elements.
Fig. 1 is a view illustrating various reference points.
Fig. 2 is a view illustrating an example of a network structure of an evolved universal terrestrial radio access network (E-UTRAN) to which the present disclosure is applicable.
Fig. 3 is a diagram illustrating an example of an architecture of a general E-URTAN and an Evolved Packet Core (EPC).
Fig. 4 is a view illustrating an example of a structure of a radio interface protocol in a control plane between a user terminal equipment (UE) and an evolved node B (eNB).
Fig. 5 is a view illustrating an example of a structure of a radio interface protocol in a user plane between a UE and an eNB.
Fig. 6 is a view illustrating an example of an architecture of a general New Radio (NR) -Radio Access Network (RAN).
Fig. 7 is a view illustrating an example of functional separation of a general NG-RAN and a fifth generation core (5 GC).
Fig. 8 is a view illustrating an example of the overall architecture of a fifth generation (5G) system.
Fig. 9 is a view illustrating an example of a wireless device suitable for use in the present disclosure.
Fig. 10 is a diagram illustrating a method of performing ProSe communication based on UE-to-network relay applied to the present disclosure.
Fig. 11 is a diagram illustrating a method of advertising a TAI through a TAI advertising process applicable to the present disclosure.
Fig. 12 is a diagram illustrating a method of performing an additional parameter notification process applicable to the present disclosure.
Fig. 13 is a diagram illustrating a method of providing TAI information of a serving cell at a relay UE applicable to the present disclosure.
Detailed Description
The following embodiments are achieved by combining structural elements and features of the present disclosure in a predetermined manner. Each structural element or feature should be selectively considered unless specified separately. Each structural element or feature may be implemented without being combined with other structural elements or features. Furthermore, some structural elements and/or features may be combined with each other to constitute embodiments of the present disclosure. The order of operations described in embodiments of the present disclosure may be changed. Some structural elements or features of one embodiment may be included in another embodiment or may be replaced with corresponding structural elements or features of another embodiment.
In the description of the drawings, a process or step that unnecessarily obscures the scope of the present disclosure will be omitted, and a process or step that can be understood by those skilled in the art will be omitted.
Throughout the specification, when a portion "comprises" or "includes" a certain component, this indicates that the other component is not excluded, but may be further included unless specifically stated. The terms "unit", "-machine/machine (-or/er)" and "module" described in the present specification denote a unit for processing at least one function or operation, which may be implemented by hardware, software, and a combination thereof. In addition, the use of "a" or "an" and "one" and "the" and similar referents may be used to cover both the singular and the plural, unless otherwise indicated herein (especially in the context of the following claims) or clearly contradicted by context.
In the present specification, embodiments of the present disclosure are described focusing on a relationship of data reception and transmission between a base station and a mobile station. Here, the base station means a terminal node of a network performing direct communication with the mobile station. In this document, certain operations described as being performed by a base station may in some cases be performed by an upper node of the base station.
That is, in a network composed of a plurality of network nodes including a base station, various operations for communicating with a mobile station may be performed by the base station or network nodes other than the base station. Here, the "base station" may be replaced by terms such as "fixed station", "Node (Node) B", "eNode B (eNB)", "gNode B (gNB)", "ng-eNB", "Advanced Base Station (ABS)" or "access point".
In addition, in the embodiments of the present disclosure, the "terminal" may be replaced with terms such as "user terminal equipment (UE)", "Mobile Station (MS)", "Subscriber Station (SS)", "mobile subscriber station (MSs)", "mobile terminal" or "Advanced Mobile Station (AMS)".
In addition, a transmitting end refers to a fixed and/or mobile node providing a data service or a voice service, and a receiving end refers to a fixed and/or mobile node receiving a data service or a voice service. Thus, in the case of uplink, the mobile station may be a transmitting end and the base station may be a receiving end. Also, in the downlink case, the mobile station may be a receiving end and the base station may be a transmitting end.
Embodiments of the present disclosure may be supported by standard documents disclosed in at least one of the following radio access systems: IEEE 802xx systems, third generation partnership project (3 GPP) systems, 3GPP Long Term Evolution (LTE) systems, 3GPP fifth generation (5G) New Radio (NR) systems, and 3GPP2 systems, and in particular, embodiments of the present disclosure may be supported by the following documents: 3GPP TS (technical Specification) 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321, and 3GPP TS 38.331.
In addition, embodiments of the present disclosure may be applicable to other radio access systems, but are not limited to the systems described above. As an example, they may be applicable to systems applied after the 3gpp 5g NR system, and are not limited to a specific system.
That is, obvious steps and portions not described in the embodiments of the present disclosure may be described with reference to the above documents. Furthermore, all terms disclosed in this document can be interpreted by standard documents.
Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description disclosed below along with the accompanying figures is intended to describe example embodiments of the present disclosure and is not intended to illustrate any unique embodiment capable of implementing the technical configuration of the present disclosure.
In addition, specific terms used in the embodiments of the present disclosure are provided to aid in understanding the present disclosure, and can be used in any other modified form without departing from the technical ideas of the present disclosure.
The following techniques may be applied to various radio access systems such as Code Division Multiple Access (CDMA), frequency Division Multiple Access (FDMA), time Division Multiple Access (TDMA), orthogonal Frequency Division Multiple Access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and so on.
For clarity of explanation, the following description is based on a 3GPP communication system (e.g., LTE, NR, etc.), but the technical ideas of the present disclosure are not limited thereto. LTE may mean a technology after 3gpp TS 36.Xxx release 8. Specifically, LTE technology after 3gpp TS 36.Xxx release 10 may be referred to as LTE-a, and technology after 3gpp TS 36.Xxx release 13 may be referred to as LTE-a-before. The 3GPP NR may mean a technology after TS 38.Xxx release 15. 3GPP 6G can mean techniques after TS release 17 and/or release 18. "xxx" means a specific number of a standard document. LTE/NR/6G may be collectively referred to as a 3GPP system.
The descriptions in standard documents published earlier than the present disclosure may be referred to for background art, terms, and abbreviations used in the present disclosure. As an example, reference may be made to 36.Xxx and 38.Xxx standard documents.
For terms, abbreviations and other contexts that may be used in this document, reference may be made to the following standard document descriptions published prior to this document. In particular, terms, abbreviations and other background related to LTE/EPS (evolved packet system) may refer to the 36.Xxx series, 23.Xxx series and 24.Xxx series, and NR (new radio)/5 GS related terms and abbreviations and other background may refer to the 38.Xxx series, 23.Xxx series and 24.Xxx series.
3GPP LTE/EPS
-3Gpp TS 36.211: physical channel and modulation
-3Gpp TS 36.212: multiplexing and channel coding
-3Gpp TS 36.213: physical layer procedure
-3Gpp TS 36.214: a physical layer; measurement of
-3Gpp TS 36.300: general description
-3Gpp TS 36.304: user Equipment (UE) procedures in idle mode
-3Gpp TS 36.306: user Equipment (UE) radio access capability
-3Gpp TS 36.314: layer 2-measurement
-3Gpp TS 36.321: media Access Control (MAC) protocol
-3Gpp TS 36.322: radio Link Control (RLC) protocol
-3Gpp TS 36.323: packet Data Convergence Protocol (PDCP)
-3Gpp TS 36.331: radio Resource Control (RRC) protocol
-3Gpp TS 36.413: s1 application protocol (S1 AP)
-3Gpp TS 36.423: x2 application protocol (X2 AP)
-3Gpp ts22.125: unmanned aerial vehicle system support in 3 GPP; stage 1
-3Gpp ts23.303: proximity-based services (Prose); stage 2
-3Gpp ts23.401: general Packet Radio Service (GPRS) enhancements for evolved universal terrestrial radio access network (E-UTRAN) access
-3Gpp ts23.402: architecture enhancements for non-3 GPP access
-3Gpp ts23.286: application layer support of V2X services; functional architecture and information flow
-3Gpp ts24.301: a non-access stratum (NAS) protocol for an Evolved Packet System (EPS); stage 3
-3Gpp ts24.302: accessing a 3GPP Evolved Packet Core (EPC) via a non-3 GPP access network; stage 3
-3Gpp ts24.334: proximity services (ProSe) User Equipment (UE) to ProSe function protocol aspects; stage 3
-3Gpp ts24.386: a User Equipment (UE) to V2X control function; protocol aspects; stage 3
3GPP NR/5GS
-3Gpp TS 38.211: physical channel and modulation
-3Gpp TS 38.212: multiplexing and channel coding
-3Gpp TS 38.213: physical layer process for control
-3Gpp TS 38.214: physical layer procedure for data
-3Gpp TS 38.215: physical layer measurement
-3Gpp TS 38.300: NR and NG-RAN Overall description
-3Gpp TS 38.304: user Equipment (UE) procedures in idle mode and RRC inactive state
-3Gpp TS 38.321: media Access Control (MAC) protocol
-3Gpp TS 38.322: radio Link Control (RLC) protocol
-3Gpp TS 38.323: packet Data Convergence Protocol (PDCP)
-3Gpp TS 38.331: radio Resource Control (RRC) protocol
-3Gpp TS 37.324: service Data Adaptation Protocol (SDAP)
-3Gpp TS 37.340: a plurality of connections; general description
-3Gpp ts23.501: system architecture for 5G systems
-3Gpp ts23.502: procedure for 5G systems
-3Gpp ts23.503: policy and charging control framework for 5G systems; stage 2
-3Gpp ts24.501: a non-access stratum (NAS) protocol for a 5G system (5 GS); stage 3
-3Gpp ts24.502: accessing a 3GPP 5G core network (5 GCN) via a non-3 GPP access network
-3Gpp ts24.526: a User Equipment (UE) policy for a 5G system (5 GS); stage 3
3GPPV2X
-3Gpp ts23.285: architecture enhancements for V2X services
-3Gpp TR 23.786: evolved Packet System (EPS) and 5G system (5 GS) for supporting advanced V2X services
-3Gpp ts23.287: architecture enhancements for 5G systems (5 GS) for supporting vehicle-to-everything (V2X) services
-3Gpp ts24.587: vehicle-to-everything (V2X) service in the 5G system (5 GS); protocol aspects; stage 3
3Gpp ts24.588: vehicle-to-everything (V2X) service in the 5G system (5 GS); a User Equipment (UE) policy; stage 3
Hereinafter, the present disclosure is described based on the terms as defined above.
Three major areas of demand for 5G include (1) the field of enhanced mobile broadband (eMBB), (2) the field of large-scale machine type communications (mMTC), and (3) the field of ultra-reliable low-latency communications (URLLC).
Some use cases may require multiple domains to optimize, and other use cases may only focus on one Key Performance Indicator (KPI). The 5G supports these different use cases in a flexible and reliable way.
5G system architecture to which the present disclosure is applicable
The 5G system is an advanced technology derived from the 4G LTE mobile communication technology, and supports a new Radio Access Technology (RAT), an extended long term evolution (eLTE) as an extended technology of LTE, a non-3 GPP access (e.g., wireless Local Area Network (WLAN) access), etc., through evolution of an existing mobile communication network structure or a net-shape structure.
The 5G system is defined based on services, and interactions between Network Functions (NF) in the architecture of the 5G system can be represented by the following two ways.
Reference points represent: indicating interactions between NF services in NFs described by point-to-point reference points (e.g., N11) between two NFs (e.g., AMF and SMF).
Service-based representation: a network function (e.g., AMF) within the Control Plane (CP) allows other authenticated network functions to access their services. The representation also includes point-to-point reference points, if necessary.
3GPP System overview
Fig. 1 illustrates various reference points.
The example of the network structure of fig. 1 discloses an LTE/EPS based network structure and may operate with reference to the matters described in the standard documents published before this document. In the network structure of fig. 1, at least one of the SGW, PDN GW, MME, SGSN and ePDG entity may operate with reference to the matters described in the standard documents published before this document. In addition, S1-MME, S1-U, S a, S2b, S3, S4, S5, S11, and SGi may exist as interfaces between each entity, which are described in standard documents published before this document. In addition, other entities and interfaces may be configured with reference to the matters described in the standard documents previously published in this document, and are not limited to a specific form.
Fig. 2 illustrates an example of a network structure of an evolved universal terrestrial radio access network (E-UTRAN) to which the present disclosure is applicable.
The E-UTRAN system is an evolved version of the existing UTRAN system and may be, for example, a 3GPP LTE/LTE-A system. Communication networks are widely deployed to provide various communication services such as voice over IMS and packet data (e.g., voice over internet protocol (VoIP)).
Referring to fig. 2, the E-UMTS network includes an E-UTRAN, EPC, and one or more UEs. The E-UTRAN consists of enbs providing control plane and user plane protocols to the UE, and the enbs are connected to each other by means of an X2 interface and reference may be made to the matters described in the standard documents published before this document.
Fig. 3 is a diagram illustrating an example of an architecture of a generic E-URTAN and Evolved Packet Core (EPC).
As illustrated in fig. 3, the eNB can perform functions such as routing to a gateway when a Radio Resource Control (RRC) connection is activated, scheduling and transmission of paging messages, scheduling and transmission of Broadcast Channels (BCH), dynamic allocation of resources to UEs in uplink and downlink, configuration and provisioning of measurements for the eNB, radio bearer control, radio admission control, and connection mobility control. The eNB can perform functions such as paging scenarios in EPC, management of LTE IDLE state, ciphering of user plane, SAE bearer control, and ciphering and integrity protection of NAS signaling.
Accessory J of 3gpp TR 23.799 shows various architectures by combining 5G and 4G. Furthermore, an architecture using NR and NGC is disclosed in 3gpp ts 23.501.
Fig. 4 is a view illustrating an example of a structure of a radio interface protocol in a control plane between a User Equipment (UE) and an evolved node B (eNB), and fig. 5 is a view illustrating an example of a structure of a radio interface protocol in a user plane between the UE and the eNB.
The radio interface protocol is based on the 3GPP radio access network standard. The radio interface protocol is laterally composed of a physical layer, a data link layer, and a network layer, and is longitudinally divided into a user plane for data information transmission and a control plane for control signaling delivery.
Protocol layers may be divided into L1 (first layer), L2 (second layer) and L3 (third layer) based on three lower layers of an Open System Interconnection (OSI) standard model well known in the art of communication systems, and reference may be made to matters described in standard documents published before the above-mentioned document.
Fig. 6 is a view illustrating an example of a wireless communication system applied to the present disclosure.
The 5GC (5G core) may include various components, some of which are shown in fig. 6, including an access and mobility management function (AMF) 410, a Session Management Function (SMF) 420, a Policy Control Function (PCF) 430, a Prose User Plane Function (UPF) 440, an Application Function (AF) 450, a Unified Data Management (UDM) 460, and a non-3 GPP interworking function (N3 IWF) 490.
The UE 100 connects to the data network via the UPF 440 through a next generation radio access network (NG-RAN) including the gNB 300. The UE 100 may even be provided with data services through non-trusted non-3 GPP access, such as Wireless Local Area Network (WLAN). In order to connect non-3 GPP access to the core network, an N3IWF 490 may be deployed.
The N3IWF 490 performs a function of managing interworking between non-3 GPP accesses and 5G systems. When the UE 100 is connected to a non-3 GPP access (e.g., wiFi called IEEE 801.11), the UE 100 may be connected to a 5G system through the N3IWF 490. The N3IWF 490 performs control signaling with the AMF 410 and is connected to the UPF 440 through an N3 interface for data transmission.
The AMF 410 may manage access and mobility in the 5G system. The AMF 410 may perform the function of managing (non-access stratum) NAS security. The AMF 410 may perform a function of handling mobility in an idle state.
The UPF 440 performs the functions of the gateway to send and receive user data. The UPF node 440 may perform all or a portion of the user plane functions of a serving gateway (S-GW) and a packet data network gateway (P-GW) of the 4G mobile communication.
The UPF 440 is a component that operates as a boundary point between a next generation radio access network (NG-RAN) and a core network and maintains a data path between the gNB 300 and the SMF 420. In addition, the UPF 440 acts as a mobility anchor as the UE 100 moves over the area served by the gNB 300. The UPF 440 can perform the function of handling PDUs. For mobility within the NG-RAN (which is defined after 3GPP release 15), UPF 440 may route packets. In addition, the UPF 440 can also function as a mobility anchor with respect to another 3GPP network (RAN previously defined by 3GPP release-15, e.g., universal Mobile Telecommunications System (UMTS) terrestrial radio Access network (UTRAN), evolved (E) -UTRAN, or Global System for Mobile communications (GERAN)/Global enhanced data rates for evolution (EDGE) RAN). The UPF 440 may correspond to a termination point of the data interface towards the data network.
PCF 430 is a node that controls the policies of the operator. The AF 450 is a server for providing various services to the UE 100. UDM 460 is a server that manages subscriber information, such as a Home Subscriber Server (HSS) for 4G mobile communications. The UDM 460 stores and manages subscriber information in a unified data store (UDR).
The SMF 420 may perform a function of allocating an Internet Protocol (IP) address of the UE 100. In addition, SMF 420 may control Packet Data Unit (PDU) sessions.
For ease of explanation, reference numerals may be omitted hereinafter for the AMF 410, SMF 420, PCF 430, UPF 440, AF 450, UDM 460, N3IWF 490, gNB 300, or UE 100, which may operate with reference to what is described in a standard document published earlier than this document.
Fig. 7 is a view illustrating an example of a structure from a node point of view expression applied to the wireless communication system of the present disclosure.
Referring to fig. 7, the ue connects to a Data Network (DN) through a next generation RAN. The Control Plane Function (CPF) node performs all or part of the functions of a Mobility Management Entity (MME) of the 4G mobile communication and all or part of the functions of a serving gateway (S-GW) and a PDN gateway (P-GW). The CPF node includes an AMF and an SMF.
The UPF node performs the function of a gateway that sends and receives user data.
An authentication server function (AUSF) authenticates and manages the UE. The network slice selection function NSSF is a node of the network slice described below.
The network open function (NEF) provides a mechanism to securely open services and functions of the 5G core.
Reference points in fig. 7 are described below. N1 represents a reference point between the UE and the AMF. N2 represents a reference point between (R) AN and AMF. N3 represents the reference point between (R) AN and UPF. N4 represents a reference point between SMF and UPF. N5 represents the reference point between PCF and AF. N6 represents the reference point between UPF and DN. N7 represents the reference point between the SMF and PCF. N8 represents the reference point between UDM and AMF. N9 represents the reference point between UPFs. N10 represents the reference point between UDM and SMF. N11 represents a reference point between AMF and SMF. N12 represents the reference point between AMF and AUSF. N13 represents the reference point between UDM and AUSF. N14 represents the reference point between AMFs. N15 represents a reference point between PCF and AMF in a non-roaming scenario and between AMF and PCF of a visited network in a roaming scenario. N16 represents the reference point between SMFs. N22 represents the reference point between AMFs and NSSF. N30 represents a reference point between PCF and NEF, and N33 may represent a reference point between AF and NEF, and the above-described entities and interfaces may be configured with reference to what is described in a standard document published earlier than this document.
The radio interface protocol is based on the 3GPP radio access network standard. The radio interface protocol is horizontally divided into a physical layer, a data link layer, and a network layer, and is vertically divided into a user plane for transmission of data information and a control plane (signaling) for transmission of control signals.
Protocol layers may be divided into L1 (layer 1), L2 (layer 2), and L3 (layer 3) based on three lower layers of the Open System Interconnection (OSI) reference model widely known in communication systems.
Hereinafter, the present disclosure will describe each layer of a radio protocol. Fig. 8 is a diagram illustrating an example of a radio interface protocol between a UE and gBN.
Referring to fig. 8, an access layer (AS) layer may include a Physical (PHY) layer, a medium access control layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, and a Radio Resource Control (RRC) layer, and operations based on each layer may be performed with reference to a description of a standard document published earlier than a current document.
Communication system suitable for use in the present disclosure
Although not limited in this regard, the various descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this disclosure are applicable to various fields in which wireless communication/connection (e.g., 5G) between devices is required.
Hereinafter, it will be described in more detail with reference to the accompanying drawings. In the following figures/description, like reference numerals may refer to like or corresponding hardware, software, or functional blocks unless otherwise specified.
Wireless device suitable for use in the present disclosure
Fig. 9 is a view illustrating an example of a wireless device suitable for use in the present disclosure.
Referring to fig. 9, a first wireless device 900a and a second wireless device 900b may transmit and receive radio signals through various radio access technologies (e.g., LTE, NR). Here, the first wireless device 900a and the second wireless device 900b may correspond to (wireless device 100x, base station 120) and/or (wireless device 100x, base station 100 x) of fig. 1.
The first wireless device 900a may include at least one processor 902a and at least one memory 904a, and further include at least one transceiver 906a and/or at least one antenna 908a. The processor 902a may be configured to control the memory 904a and/or the transceiver 906a and implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document. For example, the processor 902a may process the information in the memory 904a, generate first information/signals, and then transmit wireless signals including the first information/signals through the transceiver 906 a. In addition, the processor 902a may receive a wireless signal including the second information/signal through the transceiver 906a and then store information obtained from signal processing of the second information/signal in the memory 904 a. Memory 904a may be coupled to processor 902a and store various types of information associated with the operation of processor 902 a. For example, the memory 904a may store software code including instructions for performing some or all of the processes controlled by the processor 902a, or performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document. Here, the processor 902a and the memory 904a may be part of a communication modem/circuit/chip designed to implement radio communication technology (e.g., LTE or NR). The transceiver 906b may be coupled to the processor 902a and transmit and/or receive radio signals via at least one antenna 908a. Transceiver 906a may include a transmitter and/or a receiver. The transceiver 906a may be used interchangeably with a Radio Frequency (RF) unit. In this disclosure, a wireless device may also mean a communication modem/circuit/chip.
The second wireless device 900b may include at least one processor 902b and at least one memory 904b, and further include at least one transceiver 906b and/or at least one antenna 908b. The processor 902b may be configured to control the memory 904b and/or the transceiver 906b and implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document. For example, the processor 902b may process the information in the memory 904b, generate a third information/signal, and then transmit the third information/signal through the transceiver 906 b. In addition, the processor 902b may receive a wireless signal including fourth information/signals through the transceiver 906b and then store information obtained from signal processing of the fourth information/signals in the memory 904 b. Memory 904b can be coupled to processor 902b and store various types of information associated with the operation of processor 902 b. For example, the memory 904b may store software code including instructions for performing some or all of the processes controlled by the processor 902b, or performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document. Here, the processor 902b and the memory 904b may be part of a communication modem/circuit/chip designed to implement radio communication technology (e.g., LTE, NR). The transceiver 906b may be coupled to the processor 902b and transmit and/or receive wireless signals via at least one antenna 908b. Transceiver 906b may include a transmitter and/or a receiver. The transceiver 906b may be used interchangeably with a Radio Frequency (RF) unit. In this disclosure, a wireless device may also mean a communication modem/circuit/chip.
In addition, the structure of the wireless device applicable to the present disclosure is not limited to fig. 9, and may be configured in various forms. In particular, the present disclosure may be applied to a wireless device that performs an operation for transmitting and/or receiving a wireless signal, and is not limited to a specific form.
As an example, proSe direct discovery, which is a ProSe service-supported function, may be a procedure in which a terminal (UE) discovers and identifies other nearby terminals based on NR, E-UTRA, or WLAN. At this time, proSe direct discovery may include two types of methods: open and constrained. As an example, the open method may be a method of performing direct discovery without explicit permission of the discovery terminal. On the other hand, the restricted method may be a method of performing direct discovery only when there is explicit permission of a terminal to be discovered.
As an example, proSe direct discovery may be a service that provides only information for using a specific application about a discovered terminal. The terminal may perform additional operations through information obtained based on ProSe direct discovery, and may thus provide services.
As an example, proSe direct discovery may operate based on model a or model B, but may not be limited thereto. As an example, in model a, a ProSe function-enabled terminal may perform at least one of advertising the roles of the terminal or monitoring the roles of the terminal. As an example, the advertising terminal may be a terminal advertising specific information available in another nearby terminal allowed to be discovered. The monitoring terminal may be a terminal that monitors specific information advertised by the advertising terminal. Here, the notification terminal broadcasts the discovery message during a preset discovery period, and the monitoring terminal may operate by checking a message of interest among the broadcast messages and continuing the subsequent process. In other words, the model a may be a model that announces that a terminal actively transmits its presence and related information to surrounding terminals by broadcasting and performs discovery when a nearby monitoring terminal is interested in the information.
On the other hand, model B has a limited discovery type and may be a model in which a discoverer UE transmits a limited discovery message to a discoveree UE to perform ProSe direct discovery. More specifically, the discoverer UE may send a request including specific information to be discovered to the discoveree UE. At this time, the discoveree UE may transmit a response message including the related information to the discoveree UE based on the request message received from the discoveree UE. That is, in model B, the discoverer UE transmits a discovery request message for specific information to a specific discoveree UE, and receives a response, thereby performing ProSe direct discovery.
The direct communication may be performed based on the above. Further, as an example, the core network of the new communication system (e.g., 5G) may support at least one of ProSe direct discovery, proSe direct communication, or ProSe UE-to-network relay. At this time, the terminal operating based on the ProSe function may perform authentication. In addition, as an example, proSe direct discovery, proSe direct communication, and pre-configuration (pre-provisioning) of ProSe UE to network relay may be performed on a terminal operating based on a ProSe function through which the above-described service may be provided.
Fig. 10 is a diagram illustrating a method of performing ProSe communication based on UE-to-network relay applied to the present disclosure. Referring to fig. 10, a relay terminal (UE) 1020 may register in a network. The relay UE 1020 may be a layer 3 UE-to-network relay but is referred to as a relay UE 1020 for convenience of the following explanation. However, the relay UE 1020 may not be limited to layer 3 UE-to-network relay.
After registration in the network, the relay UE 1020 may establish a PDU session to provide a relay to the remote terminal (UE) 1010 or change the current PDU session to provide a relay. Relay UE 1020 may use the PDU session for traffic relay to remote UE 1010.
More specifically, referring to fig. 10, service authentication and configuration (provisioning) of the relay UE 1020 may be performed. Further, as an example, service authentication and configuration of the remote UE 1010 may also be performed. At this time, the relay UE 1020 may establish or change a PDU session for relay. Thereafter, the remote UE 1010 may perform a discovery procedure for the relay UE 1020. At this time, the remote UE 1010 may identify a service that may be accessed based on the relay UE 1020 through a discovery procedure. As an example, the remote UE 1010 may discover a relay UE 1020, the relay UE 1020 providing a service for a Relay Service Code (RSC) value set through the relay UE 1020 and the N3IWF connection to the 5 GC. Thereafter, the remote UE 1010 and the relay UE 1020 may establish a connection for unicast mode communication. If there is no PDU session associated with the relay service code or a new PDU session is required for relay, the relay UE 1020 may begin a new PDU session establishment procedure before completion of the PC5 connection establishment. In addition, the relay UE 1020 may determine a PDU session type for relay. At this time, the relay UE 1020 may perform a relay function in the corresponding layer based on the PDU session type of the relay. Thereafter, an IP address and prefix may be assigned to the remote UE 1010. The relay UE 1020 providing a connection with 5GC through the N3IWF and the remote UE 1010 having established a unicast connection may select the N3IWF and determine the IP address of the N3 IWF. The remote UE 1010 uses the N3IWF and IKE procedures to establish an IPsec tunnel for signaling. Registration is then performed using 5 GC. Thereafter, the remote UE 1010 may perform 5GC and NAS procedures through the established IPsec tunnel. As an example, the remote UE 1010 may perform a PDU session establishment procedure.
Here, as an example, there may be a relay UE 1020 that provides a relay to the remote UE 1010 through an N3IWF (non-3 GPP interworking function) and a relay UE 1020 that provides a relay to the remote UE 1010 without the N3IWF. As an example, the N3IWF may be located in the RAN to accommodate non-3 GPP access, and the N3IWF may support an interface between the UE and the core network. In other words, the N3IWF may be a network function for accommodating non-3 GPP access. Here, in the case where the relay UE 1020 provides a relay to the remote UE 1010 through the N3IWF, the relay UE 1020 may advertise a Tracking Area Identity (TAI) corresponding to a serving cell of the relay UE 1020 to help the remote UE 1010 select the N3IWF. Here, the TAI may be advertised as a relay discovery additional information message through a PC5 discovery message, i.e., using a PC5-D protocol stack. However, an operation of transmitting the relay discovery additional information message including the TAI described above needs to be defined. Specifically, an operation regarding the timing and conditions of transmitting the relay discovery additional information message including the TAI, which will be described later, may be required.
As an example, to relay traffic of the remote UE 1010 through the N3IWF, the relay UE 1020 may establish a PDU session based on ProSe policies that allow the N3IWF access. Here, the PDU session for transmitting the service through the N3WIF may exist together with a separate PDU session of the relay UE, and is not limited to the above-described embodiment. That is, the PDU session may be established such that traffic of the remote UE 1010 is relayed through the N3IWF, and is not limited to a particular implementation.
The remote UE 1010 may select an N3IWF to transmit the traffic of the remote UE 1010 through an N3IWF selection procedure. As an example, the remote UE 1010 may be configured by the HPLMN using an N3IWF identifier configuration for relay of the remote UE to support N3IWF selection. The remote UE 1010 may use the above-described N3IWF identifier configuration when the remote UE 1010 decides to select an N3IWF in the HPLMN.
As an example, when supporting the remote UE 1010 selected based on the N3IWF, the relay UE 1020 supporting the N3IWF access may advertise a 5GS TAI corresponding to the serving cell, which will be described later. When the support of the remote UE 1010 is selected based on the N3IWF, the remote UE 1010 may select the N3IWF and obtain the corresponding IP address. Thereafter, the remote UE 1010 may perform NAS registration, connect to the N3IWF, and perform communication through the relay UE 1020. That is, the remote UE 1010 may register in the network through the relay UE 1020 with N3IWF support.
As an example, the relay service code may be included in an advertisement message for layer 3 UE-to-network relay. Here, the relay service code may be associated with parameters of the PDU session. By way of example, parameters of a PDU session include PDU session type, data Network Name (DNN), session and Service Continuity (SSC) mode, network slice selection assistance information (S-NSSAI), access type preferences, and other information, and are not limited to a particular implementation. Further, as an example, the relay service code may indicate the above information when the relay UE provides a secure N3IWF connection.
As a more specific example, when the remote UE discovers the relay UE, the relay service code included in the solicitation message may indicate parameters of the PDU session that must be supported for relay. In addition, the relay service code may indicate the above information as described above when the relay UE provides a secure N3IWF connection.
Further, as an example, the advertiser UE for layer 3UE to network relay may additionally send a relay discovery additional information message. Here, the relay discovery additional information message may include at least one of a relay service code, advertiser information, NR Cell Global Identifier (NCGI), or Tracking Area Identification (TAI) information shown in table 1 below, but is not limited thereto. Here, the relay discovery additional information message may include TAI as identifier information of the tracking area of the relay UE, as shown in table 1 below. As an example, the tracking area may include one or more neighboring cells, and the TAI for identifying the tracking area of the terminal may be determined based on the terminal location. Here, when relay is provided to the remote UE through the N3IWF, the remote UE may need to relay the TAI information of the UE to select the N3IWF, and the TAI information may be included in the relay discovery additional information message. However, the TAI may not always be included in the relay discovery additional information message, and a case where the relay discovery additional information message includes the TAI will be described below.
TABLE 1
Hereinafter, a method of providing relay related information will be described based on the above. As an example, the methods provided below may be based on at least one of the following combinations of operations, configurations, and steps.
As an example, the following may be an operation of a User Equipment (UE) or a terminal, and is referred to as a terminal for convenience of explanation, but may not be limited thereto. Further, for ease of explanation, UE-to-network relay, proSe UE-to-network relay, relay UE, UE-NW relay, 5G ProSe UE-to-network relay, 5G ProSe UE-to-NW relay, 5G ProSe UE-to-network relay UE may be used interchangeably and referred to as relay UE, but may not be limited thereto. In addition, for convenience of explanation, a remote UE, a 5G ProSe remote UE, etc. may be used interchangeably and referred to as a remote UE, but may not be limited thereto.
In addition, hereinafter, direct discovery, proSe discovery, 5G ProSe direct discovery, PC5 discovery, etc. are used interchangeably and are referred to as discovery for convenience of explanation, but may not be limited thereto. In addition, direct communication, proSe direct communication, 5GProSe direct communication, and PC5 communication are used interchangeably and are referred to as direct communication for convenience of explanation, but may not be limited thereto. In addition, as an example, TS23.304 may be referred to below as basically ProSe-related operations and procedures, but may not be limited thereto.
When supporting a remote UE selected based on the N3IWF, a relay UE supporting the N3IWF access may advertise a TAI corresponding to the serving cell, as described above. Here, the relay UE may advertise the TAI through a TAI advertising process, an additional parameter advertising process, and other processes, and is not limited to a specific form.
As a specific example, fig. 11 is a diagram illustrating a method of advertising a TAI through a TAI advertising process applicable to the present disclosure. Referring to fig. 11, when the remote UE 1110 selects an N3IWF, the remote UE 1110 may need to relay TAI information of a serving cell of the UE 1120. Thus, the remote UE 1110 may request a TAI of the serving cell of the relay UE from the relay UE 1120 for relay service. The remote UE 1110 may select an N3IWF through the advertised TAI to communicate with the 5 GC. As another example, when a connection with an existing N3IWF fails or a connection disconnection occurs, the remote UE 1110 may need to relay TAI information of the UE 1120 to select a new N3IWF, and is not limited to a particular implementation. At this time, the remote UE 1110 may transmit a TAI advertisement request message to the relay UE 1120. That is, the remote UE 1110 may request the TAI of the serving cell of the relay UE from the relay UE 1120. When relay UE 1120 receives the TAI advertisement request, relay UE 1120 may send a TAI advertisement response as an acknowledgement response to remote UE 1110. That is, the relay UE 1120 may send a response to the receipt of the request message to the remote UE 1110. Thereafter, the relay UE 1120 may send a relay discovery additional information message including the TAI to the remote UE 1110. As an example, the relay discovery additional information message may be transmitted in a broadcast form. As a specific example, it may be transmitted in a broadcast form based on a default destination layer 2ID set to be used when transmitting the PC5 discovery message.
As another example, the relay discovery additional information message may be transmitted to the above-described remote UE 1110 as a destination in a unicast form. As a specific example, the layer 2ID of the remote UE 1110 may be set as the destination layer 2ID and transmitted.
Here, as an example, the relay UE 1120 may transmit the TAI information once based on a request from the remote UE 1110, and the relay UE 1120 may transmit the TAI information to the remote UE 1110 even if the TAI information is changed. At this time, the relay UE 1120 that transmits the TAI information substantially once based on the request from the remote UE 1110 may be determined based on at least one of a local configuration, a policy, a UE implementation, a relay status (e.g., a remaining battery level, etc.), PC5 congestion, or PC5 CBR (channel busy rate), and may not be limited to a specific embodiment.
As another example, the relay UE 1120 may transmit the relay discovery additional information message one or more times. For example, when a remote UE other than the remote UE 1110 described above is connected to the relay UE 1120, the relay discovery additional information message may be transmitted one or more times. More specifically, if a remote UE other than the remote UE 1110 described above is connected to the relay UE 1120 and a TAI announcement has not been requested from the relay UE 1120, the relay UE 1120 may transmit the relay discovery additional information message one or more times. As an example, the relay UE 1120 has not received the TAI advertisement request from one or more remote UEs 1110 other than the remote UE 1110, but the relay UE 1120 may send the relay discovery additional information message multiple times. As an example, the relay UE 1120 has not received a TAI announcement request from one or more other remote UEs 1110 other than the remote UE 1110, but this may be a transmission in which case other remote UEs 1110 connected to the relay UE 1120 are considered.
Here, as an example, the relay UE 1120 may transmit the relay discovery additional information message in a broadcast form. Specifically, the relay UE 1120 may perform transmission using a default destination layer 2ID set to be used when transmitting the PC5 discovery message as a destination identifier, but is not limited thereto. Thus, the relay UE 1120 may send the relay discovery additional information message one or more times in consideration of one or more other remote UEs connected to the relay UE 1120. This is because when the relay UE 1120 receives the TAI announcement request from the remote UE 1110 and first transmits the TAI information in a broadcast form, other remote UEs may not be ready or may not be intended to receive the relay discovery additional information including the TAI information. As an example, at the time described above, other remote UEs may not be ready to receive the relay discovery additional information message including TAI information because the unicast connection establishment procedure with relay UE 1120 is being completed.
As another example, the relay UE 1120 may send the relay discovery additional information message in unicast form to one or more other remote UEs connected to the relay UE 1120 as a destination. Thus, a relay discovery additional information message including TAI information may be transmitted to a remote UE connected to relay UE 1120 that has not requested a TAI information announcement.
As described above, when the relay UE 1120 transmits the relay discovery additional information message one or more times, other remote UEs may also receive the TAI information of the relay UE without a separate request. At this time, other remote UEs that do not request the TAI information may identify the relay UE that has transmitted the relay discovery additional information message based on at least one of a relay service code, advertisement information, or source layer 2ID (i.e., layer 2ID for the relay UE to use the relay discovery additional message). That is, the other remote UE may determine whether the relay UE that has transmitted the relay discovery additional information message is the relay UE selected thereby based on the above information. Here, as an example, the number of other remote UEs that do not request TAI information may be one or more, and is not limited to a particular embodiment.
As another example, when the relay UE transmits the relay discovery additional information message one or more times, at least one of the number of repeated transmissions or the repetition period of the relay discovery additional information message may be set in the relay UE.
Here, when there are one or more other remote UEs, the relay UE may decide to always transmit the relay discovery additional information message. As another example, when there is a set value such as the above-described number of repeated transmissions and repetition period, the relay UE may determine relay discovery additional information message transmission based on the set value for the relay discovery additional information message based on at least one of a local configuration, a policy, network indication information, or an implementation, and is not limited to a specific embodiment.
As described above, the relay UE has established a unicast connection (i.e., L2 link) with the relay UE, and if there is a remote UE that has not requested TAI information, the relay discovery information message may be transmitted one or more times. (hereinafter, case a) as another example, if there is a remote UE that is establishing a unicast connection, the relay UE may transmit the relay discovery information message one or more times. (hereinafter, case b) as another example, when the relay UE is discovered in response to the remote UE, the relay UE may transmit the relay discovery information message one or more times. (hereinafter, case c) as another example, if there is another remote UE serving the relay UE in addition to the remote UE requesting the TAI information, the relay discovery information message may be transmitted one or more times (hereinafter, case d).
In the above case, the relay UE may transmit the relay discovery information message one or more times based on the relay UE decision. As an example, if the relay UE decides to provide the TAI information to one or more other remote UEs not requesting the TAI information other than the remote UE requesting the TAI information, the relay UE may transmit a discovery information message including the TAI information one or more times.
As another example, the relay UE may send a message including the TAI information one or more times even if there is no request for the TAI information from the remote UE. As a specific example, the relay UE may establish a unicast connection with the remote UE #1 and then transmit a message including TAI information without requesting the TAI information from the remote UE # 1. Here, the relay UE may transmit a message including TAI information based on at least one of the above cases a to d.
As another example, if the relay UE decides to provide TAI information to a remote UE other than remote UE #1, the relay UE may transmit a message including the TAI information one or more times. Based on the above, one or more remote UEs other than remote UE #1 may also obtain TAI information.
In fig. 11, the description requests TAI information based on a PC5-S message using a TAI announcement request/response, but may not be limited thereto. That is, another PC5-S message may be used to request TAI information. As another example, the PC5 discovery message may be used to request TAI information and is not limited to a particular implementation. In addition, in fig. 11, the relay UE may include TAI information in a response (or ACK) message with respect to a request message requesting the TAI information and transmit it to the remote UE. Here, if the relay UE decides to transmit a message including TAI information one or more times, the relay UE may transmit a response (or ACK) message one or more times. As another example, if the relay UE decides to transmit a message including TAI information one or more times, the relay UE transmits a response (or ACK) message one time and then may additionally transmit a message including TAI information one or more times. Here, at least one of a response (or ACK) message or a message including TAI information may be transmitted to a remote UE requesting TAI information as a destination. As a specific example, the message may be transmitted by setting the layer 2ID of the remote UE as the destination layer 2 ID. As another example, at least one of a response (or ACK) message or a message including TAI information may be transmitted in a broadcast form. As a specific example, it may be transmitted in a broadcast form based on a default destination layer 2ID set to be used when transmitting the PC5 discovery message.
As an example, the description is based on a layer 3 remote UE receiving a connection service according to a layer 3 UE-to-network relay with N3IWF support, but the above-described method may not be limited thereto. That is, the above method may be equally applied to layer 2 UE-to-network relay and layer 2 remote UEs. As another example, it may be equally applied to layer 3 UE-to-network relay without N3IWF support and layer 3 remote UEs receiving network connection services through such relay UEs, and may not be limited to a particular implementation.
As another example, when the remote UE requests TAI information from the relay UE, the relay UE may periodically and repeatedly transmit a message including the TAI information. In addition, when the TAI is changed, the relay UE may transmit a message including the TAI information to one or more other remote UEs one or more times (i.e., additionally) based on a method of transmitting the changed TAI, but is not limited thereto. Here, as an example, when a message including TAI information is additionally transmitted for other remote UEs, the message including TAI information may be additionally transmitted to other remote UEs with a period shorter/smaller than a repetition transmission period of the message including TAI information. That is, after the first transmission of the message including the TAI information, the message including the TAI information may also be transmitted for other remote UEs before the next transmission is performed, and is not limited to the above-described embodiment.
As another example, when the remote UE requests a TAI announcement from the relay UE, the remote UE may request to announce the TAI information only once. Thus, the relay UE may basically advertise TAI information once. However, as described above, the relay UE may additionally advertise TAI information in consideration of the presence of one or more other remote UEs, and is not limited to a particular embodiment.
As another example, when the remote UE requests a TAI announcement from the relay UE, the relay UE may periodically and repeatedly transmit a message including the TAI information. In addition, when the TAI information is changed, the relay UE transmits the changed TAI information. However, as described above, the relay UE may send a message including TAI information multiple times (i.e., additionally) taking into account the presence of one or more other remote UEs. In this case, the message including the TAI information may be additionally transmitted for other remote UEs with a period shorter/smaller than the repetition transmission period (i.e., after the first transmission of the message including the TAI information, before the next transmission is performed).
Fig. 12 is a diagram illustrating a method of performing an additional parameter notification process applicable to the present disclosure.
Referring to fig. 12, a remote UE (5G ProSe remote UE) 1210 may obtain additional parameter information from a relay UE (5G ProSe UE to network relay) 1220 through an additional parameter advertisement process. In particular, the remote UE 1210 may request an announcement of the additional parameters from the relay UE 1220 using an additional parameter announcement procedure. As an example, the remote UE 1210 may request the relay UE to advertise at least one of an NR Cell Global ID (NCGI) of the relay UE's serving cell or a TAI of the relay UE's serving cell through an additional parameter advertisement procedure.
As a more specific example, referring to fig. 12, a remote UE 1210 may discover a relay UE 1220. Here, the remote UE 1210 may request the discovered relay UE 1220 to announce NCGI of the relay UE's serving cell. As another example, the remote UE 1210 may need to relay the TAI information of the UE's serving cell for N3IWF selection and may request the relay UE 1220 to advertise the TAI for this.
The remote UE 1210 may send an additional parameter advertisement request to the relay UE 1220 to obtain additional parameters. That is, the remote UE 1210 may transmit a request message to the relay UE 1220 to announce at least one of NCGI of the serving cell of the relay UE and the TAI of the serving cell of the relay UE. At this time, the additional parameter advertisement request message may include, as an example, indication information requesting that the advertisement is performed only once for the TAI. That is, the additional parameter advertisement request message may include one advertisement request indication information. As another example, the additional parameter advertisement request message may include indication information requesting that the advertisement is performed only once not only for TAIs but also for other additional parameters (e.g., NCGI). That is, the additional parameter advertisement request message may further include one advertisement request indication information for other additional parameters (e.g., NCGI). Here, the one-time announcement request indication information may be explicitly indicated by an additional parameter announcement request message. As a specific example, a field or bit for indicating one notification request may be included, but may not be limited thereto.
Alternatively, the one-time announcement request indication information may be implicitly indicated by an additional parameter announcement request message. That is, one announcement request may be implicitly indicated by setting or information in the additional parameter announcement request message without a separate bit or field, but may not be limited thereto.
As another example, the additional parameter advertisement request message may include indication information for each of the requested parameters. That is, the notification request indication information may be included once for each additional parameter. Thereby, it is indicated whether or not the announcement will be performed only once for each additional parameter. As another example, the additional parameter advertisement request message may include one advertisement request indication information indicating that advertisement is performed only once for all requested parameters. That is, whether all additional parameters will be advertised only once can be indicated together.
Thereafter, the relay UE 1220 may send an additional parameter advertisement response as an Acknowledgement (ACK) response to the remote UE 1210. Here, the additional parameter advertisement response may include an additional parameter advertisement request refresh timer. An additional parameter advertisement request refresh timer may be configured in the relay UE 1220 and may be provided to the remote UE 1210 by an additional parameter advertisement response. Here, if there are necessary additional parameters, the remote UE 1210 may obtain the additional parameters by transmitting an additional parameter advertisement request message until the additional parameter advertisement request refresh timer expires.
Here, the relay UE 1220 may stop advertising the additional parameter when the remote UE 1210 does not start a new additional parameter advertisement request procedure until the additional parameter advertisement request refresh timer expires, and the other UEs do not perform the additional parameter advertisement request until the additional parameter advertisement request refresh timer expires in the relay UE 1220.
As an example, a case where the remote UE 1210 requests TAI information from the relay UE 1220 and indicates that the announcement is performed only once through the above-described one-time announcement request instruction information may be considered. The relay UE 1220 may not include the additional parameter advertisement request refresh timer in the additional parameter advertisement response message. In other words, since the announcement is indicated to be performed only once in the relay UE, a timer for the announcement may be unnecessary, and accordingly, the additional parameter announcement request refresh timer may not be included in the additional parameter announcement response message.
In addition, as an example, the following can be considered: the remote UE 1210 includes one-time advertisement request indication information indicating whether to perform advertisement only once for not only TAI information but also other additional parameters (e.g., NCGI) in the additional parameter advertisement request. Here, when it is indicated that the announcement is performed only once for all the requested parameters, the relay UE 1220 may not include the additional parameter announcement request refresh timer in the additional parameter announcement response message. In other words, if one announcement request indication information for other additional parameters is included, the additional parameter announcement request refresh timer may not be included in the additional parameter announcement response message only when the indication announcement is performed only once for all parameters.
After the relay UE 1220 transmits the additional parameter advertisement response as an acknowledgement response to the remote UE 1210, the relay UE 1220 may advertise the additional parameter by relaying the discovery additional information message. The announcement may be repeated based on a specific period, while the additional parameter announcement requests that the refresh timer operate in the relay UE. Here, the specific period may be shorter than the above-described additional parameter notification request refresh timer. That is, the specific period may be set more frequently than the above-described additional parameter notification request refresh timer.
Based on the above, the relay UE 1220 may advertise at least one of NCGI of the relay UE's serving cell or the TAI of the relay UE's serving cell. The remote UE 1210 may obtain additional parameter information advertised by the relay UE 1220. Here, as an example, when the remote UE 1210 requests the advertisement request indication information (which indicates that the advertisement is performed once for the TAI information) once from the relay UE 1220, the relay UE may only advertise the TAI information once and may not perform the subsequent procedure. In addition, as an example, the remote UE 1210 requests one announcement request indication information indicating that announcement is performed not only for TAI information but also for other additional parameters (e.g., NCGI) from the relay UE 1220 once, the relay UE may perform announcement once for all parameters requesting one announcement, and may not perform subsequent processes.
Here, as an example, even if the remote UE 1210 transmits one advertisement request indication information indicating that advertisement is performed once for the TAI information to the relay UE 1220, the relay UE 1220 may advertise the relay discovery additional information including the TAI information one or more times. More specifically, when there are one or more other remote UEs connected to the relay UE 1220 and the one or more other remote UEs have not requested an announcement from the relay UE 1220, the remote UE 1210 may announce the relay discovery additional information including the TAI information one or more times even if the remote UE 1210 transmits indication information indicating that the announcement is performed once for the TAI information to the relay UE 1220. Thus, one or more other remote UEs may obtain the TAI information without requesting the TAI information from the relay UE 1220.
Further, as an example, the remote UE 1210 includes one advertisement request indication information in the additional parameter advertisement request, the one advertisement request indication information indicating a request for one advertisement not only for TAI but also for other additional parameters (e.g., NCGI), the relay UE 1220 may additionally continue the advertisement for other additional parameters in consideration of the presence of one or more other remote UEs, even if the remote UE requests one advertisement, and is not limited to the specific embodiment.
That is, the relay UE 1220 may perform one advertisement for all additional parameters that the remote UE 1210 has requested one advertisement. However, when there are one or more other remote UEs connected to the relay UE 1220, the relay UE 1220 may additionally perform advertisement when it is determined that advertisement is necessary for the one or more other remote UEs, even if there is no advertisement request for the one or more other remote UEs.
Next, the relay UE 1220 may discover new additional parameters. As a specific example, the relay UE 1220 may identify a new NCGI of the new serving cell based on camping on the new serving cell, or may identify a new TAI based on the movement of the relay UE 1220. At this time, the relay UE 1220 may discover new additional parameters. When the additional parameter is newly discovered, the relay UE may immediately announce the new additional parameter by relaying the additional information message. As another example, the relay UE 1220 may announce additional parameters based on a preset period as described above. Here, the relay UE 1220 may announce the additional parameters until no additional parameters are requested by the UE to be announced (that is, until the additional parameters announce request refresh timer expires).
As an example, as described above, the operation of transmitting a message including TAI information a plurality of times may include an operation of including and transmitting TAI information in addition to the initial transmission of the above-described message. As a specific example, when the relay UE transmits a message including relay related information of information other than TAI information (e.g., NCGI information), an operation of additionally including and transmitting TAI information after the initial transmission of the above-described message may be further included, and is not limited to a specific example.
Further, as an example, the decision of the relay UE 1220 to send TAI information to one or more other remote UEs other than the remote UE requesting TAI information may be a decision of the relay UE 1220 that one or more other remote UEs may also need or request TAI information, and is not limited to a particular embodiment. In addition, the relay related information provided by the relay UE 1220 may be TAI information, but may also include other information than TAI information, and may not be limited to a specific embodiment. By the above, the remote UE that needs to relay the TAI information of the UE can obtain the message including the TAI information without a request, thereby saving PC5 resources and time required for the request.
Fig. 13 is a diagram illustrating a method of providing TAI information of a serving cell at a relay UE applicable to the present disclosure. The relay UE may receive an advertisement request message requesting an advertisement of a Tracking Area Identity (TAI) from the first remote UE (S1310). Here, in the above-described operation, the TAI requesting the serving cell from the relay UE may be performed based on an additional parameter notification procedure. As an example, the advertisement request message requesting the advertisement of the TAI may be an additional parameter advertisement request message.
Thereafter, the relay UE may transmit an announcement response message as an acknowledgement response to the first remote UE (S1320). Here, the announcement response message may be an additional parameter announcement response. Next, the relay UE may transmit a message including a TAI of a serving cell of the relay UE (S1330). At this time, the message including the TAI of the serving cell of the relay UE may be a relay discovery additional information message.
As an example, when one or more remote UEs other than the first remote UE are connected to the relay UE, the relay UE may transmit a message including a TAI of a serving cell of the relay UE one or more times. Thus, one or more UEs other than the first remote UE may obtain the TAI information without a TAI announcement request, thereby saving resources and time.
Alternatively, when one or more remote UEs other than the first remote UE are connected to the relay UE and the connected one or more remote UEs other than the first remote UE do not transmit a message requesting notification of the TAI, the message including the TAI of the serving cell of the relay UE may be transmitted one or more times. That is, if there is another remote UE that has not requested a TAI announcement, the relay UE may transmit a message including the TAI of the serving cell of the relay UE one or more times. Here, as an example, the relay UE may transmit a message including the TAI of the serving cell of the relay UE one or more times based on the implementation of the relay UE.
In addition, the relay UE may repeatedly transmit the relay discovery additional information message based on a preset period while the additional parameter advertisement request refresh timer is operated in the relay UE. That is, the relay discovery additional information message may be repeatedly transmitted according to a preset period based on a timer configured in the relay UE.
In addition, when the relay UE detects a new additional parameter or an update of the additional parameter, the relay UE may transmit the new additional parameter or the updated additional parameter through the relay discovery additional information message.
As another example, based on the additional parameter advertisement request message, the first remote UE may request an advertisement of additional parameters from the relay UE. Here, the additional parameter may include at least one of a TAI of a serving cell of the relay UE or an NR Cell Global Identifier (NCGI) of the serving cell of the relay UE. Here, the relay UE may receive an additional parameter advertisement request message including one-time advertisement indication information indicating that the relay UE only advertises the additional parameter once from the first remote UE. At this time, the relay UE may advertise the additional parameter only once based on the one-time advertisement indication information. However, even if the one-time announcement indication information indicates that the additional parameter is announced only once, the relay UE may transmit the additional parameter one or more times when one or more remote UEs other than the first remote UE are connected to the relay UE. That is, if necessary in consideration of one or more other remote UEs, the relay UE may transmit the additional parameters one or more times, and is not limited to a specific embodiment. In addition, the one-time announcement indication information may be set in the TAI of the serving cell of the relay UE and NCGI of the serving cell of the relay UE, respectively, or may be set as one (one), as described above.
As another example, the relay UE may perform relay of the first remote UE through a non-3 GPP interworking function (N3 IWF). In view of the above, the first remote UE may select an N3IWF based on the TAI of the serving cell of the relay UE. In addition, as an example of the present disclosure, a message including the TAI of the serving cell of the relay UE based on the advertisement request message may be transmitted in a broadcast manner based on the default destination layer 2ID set to be used when the PC5 discovery message is transmitted, as described above.
Since the examples of the proposed methods described above may also be included in one of the implementation methods of the present disclosure, it is apparent that they may be regarded as one proposed method. In addition, the proposed methods described above may be implemented alone or in a combination (or combination) of some of them. The rule may be defined such that information on whether to apply the suggested method (or information on the rule of the suggested method) is notified from the base station to the terminal through a predefined signal (e.g., a physical layer signal or an upper layer signal).
The present disclosure can be embodied in other specific forms without departing from its technical spirit or essential characteristics as described in the present disclosure. The foregoing detailed description is, therefore, not to be construed as limiting in all aspects, but rather as exemplary. The scope of the present disclosure should be determined by reasonable interpretation of the appended claims, and all changes that come within the equivalent scope of the disclosure are intended to be embraced therein. In addition, claims that do not explicitly refer to the relationship in the claims may be combined to form an embodiment or included as new claims by modification after submission.
Industrial applicability
Embodiments of the present disclosure are applicable to various radio access systems. Examples of various radio access systems include the third generation partnership project (3 GPP) or 3GPP2 systems.
Embodiments of the present disclosure are applicable not only to various radio access systems, but also to all technical fields to which various radio access systems are applied. Furthermore, the proposed method is applicable to millimeter wave and terahertz wave communication systems using ultra-high frequency bands.
In addition, embodiments of the present disclosure are applicable to various applications, such as autonomous vehicles, drones, and the like.
Claims (17)
1. A method of operating a terminal in a wireless communication system, the method comprising the steps of:
receiving, by the relay terminal, an announcement request message from the first remote terminal requesting an announcement of the tracking area identity TAI;
transmitting, by the relay terminal, an announcement response message as an acknowledgement response to the first remote terminal; and
Based on the advertisement request message, a message including a TAI of a serving cell of the relay terminal is advertised,
Wherein the relay terminal sends a message comprising the TAI of the serving cell of the relay terminal one or more times based on one or more other remote terminals than the first remote terminal being connected to the relay terminal.
2. The method of claim 1, wherein the message of the TAI including the serving cell of the relay terminal is sent one or more times based on one or more other remote terminals other than the first remote terminal being connected to the relay terminal and the one or more connected remote terminals other than the first remote terminal not sending a message requesting notification of the TAI.
3. The method of claim 2, wherein the relay terminal transmits the message including the TAI of the serving cell of the relay terminal one or more times based on an implementation of the relay terminal.
4. The method according to claim 1,
Wherein said request for said TAI of said serving cell of said relay terminal is made based on an additional parameter advertisement procedure,
Wherein the advertisement request message requesting the advertisement of the TAI is an additional parameter advertisement request message,
Wherein the announcement response message is an additional parameter announcement response message, and
Wherein the message including the TAI of the serving cell of the relay terminal is a relay discovery additional information message.
5. The method of claim 4, wherein the relay terminal repeatedly transmits the relay discovery additional information message based on a preset period while an additional parameter advertisement request refresh timer is operated in the relay terminal.
6. The method of claim 5, wherein the relay terminal transmits the new additional parameter or the updated additional parameter through the relay discovery additional information message based on the relay terminal detecting the new additional parameter or the update of the additional parameter.
7. The method according to claim 4, wherein the method comprises,
Wherein the first remote terminal requests announcement of an additional parameter from the relay terminal based on the additional parameter announcement request message, and
Wherein the additional parameter includes at least one of the TAI of the serving cell of the relay terminal or an NR cell global identifier NCGI of the serving cell of the relay terminal.
8. The method according to claim 7,
Wherein the relay terminal receives the additional parameter advertisement request message from the first remote terminal, the additional parameter advertisement request message including one-time advertisement indication information indicating that the relay terminal only advertises the additional parameter once, and
Wherein the relay terminal announces the additional parameter only once based on the one-time announcement indication information.
9. The method of claim 8, wherein the relay terminal transmits the additional parameter one or more times based on one or more other remote terminals except the first remote terminal being connected to the relay terminal even though the one-time announcement indication information indicates that the additional parameter is announced only once.
10. The method of claim 8, wherein the one-time announcement indication information is set in the TAI of the serving cell of the relay terminal and the NCGI of the serving cell of the relay terminal, respectively.
11. The method according to claim 1,
Wherein the relay terminal performs relay of the first remote terminal through a non-3 GPP interworking function N3IWF, and
Wherein the first remote terminal selects the N3IWF based on the TAI of the serving cell of the relay terminal.
12. The method of claim 1, wherein the message including the TAI of the serving cell of the relay terminal is transmitted in a broadcast form based on a default destination layer 2ID set to be used when transmitting a PC5 discovery message, based on the advertisement request message.
13. A relay terminal operating in a wireless communication system, the relay terminal comprising:
At least one transceiver;
at least one processor; and
At least one memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform certain operations,
Wherein the specific operation includes:
controlling the at least one transceiver to receive an announcement request message from the first remote terminal requesting an announcement of a tracking area identity, TAI;
Controlling the at least one transceiver to cause the relay terminal to send an announcement response message as an acknowledgement response to the first remote terminal; and
Controlling the at least one transceiver to announce a message including a TAI of a serving cell of the relay terminal based on the announcement request message,
Wherein the relay terminal sends a message comprising the TAI of the serving cell of the relay terminal one or more times based on one or more other remote terminals than the first remote terminal being connected to the relay terminal.
14. A method of operating a terminal in a wireless communication system, the method comprising the steps of:
Transmitting, by the remote terminal, an announcement request message requesting announcement of the tracking area identity TAI to the relay terminal;
receiving, by the remote terminal, an announcement response message from the relay terminal as an acknowledgement response; and
Receiving a message including a TAI of a serving cell of the relay terminal from the relay terminal based on the advertisement request message,
Wherein the relay terminal sends a message comprising the TAI of the serving cell of the relay terminal one or more times based on one or more other remote terminals than the first remote terminal being connected to the relay terminal.
15. A terminal operating in a wireless communication system, the terminal comprising:
At least one transceiver;
at least one processor; and
At least one memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform certain operations,
Wherein the specific operation includes:
Controlling the at least one transceiver to send an announcement request message to the relay terminal requesting an announcement of the tracking area identity TAI;
controlling the at least one transceiver to cause the remote terminal to receive an announcement response message from the relay terminal as an acknowledgement response; and
Control the at least one transceiver to receive a message including a TAI of a serving cell of the relay terminal from the relay terminal based on the advertisement request message,
Wherein the relay terminal sends a message comprising the TAI of the serving cell of the relay terminal one or more times based on one or more other remote terminals than the first remote terminal being connected to the relay terminal.
16. An apparatus comprising at least one memory and at least one processor functionally connected to the at least one memory, wherein the at least one processor controls the apparatus to:
Receiving an announcement request message from another device requesting an announcement of a tracking area identity, TAI;
sending an announcement response message as an acknowledgement response to the other device; and
Based on the advertisement request message, advertising a message including a TAI of a serving cell of the device,
Wherein the device sends a message comprising the TAI of the serving cell of the device one or more times based on one or more other devices other than the device being connected to the device.
17. A non-transitory computer readable medium storing at least one instruction, the non-transitory computer readable medium comprising the at least one instruction executable by a processor, the at least one instruction controlling a device to:
Receiving an announcement request message from another device requesting an announcement of a tracking area identity, TAI;
sending an announcement response message as an acknowledgement response to the other device; and
Based on the advertisement request message, advertising a message including a TAI of a serving cell of the device,
Wherein the device sends a message comprising the TAI of the serving cell of the device one or more times based on one or more other devices other than the device being connected to the device.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2021-0149677 | 2021-11-03 | ||
| KR10-2021-0157247 | 2021-11-16 | ||
| KR20210157247 | 2021-11-16 | ||
| PCT/KR2022/017138 WO2023080678A1 (en) | 2021-11-03 | 2022-11-03 | Method and apparatus for providing relay in wireless communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118176752A true CN118176752A (en) | 2024-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280073336.3A Pending CN118176752A (en) | 2021-11-03 | 2022-11-03 | Method and apparatus for providing relay in wireless communication system |
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| CN (1) | CN118176752A (en) |
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2022
- 2022-11-03 CN CN202280073336.3A patent/CN118176752A/en active Pending
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