WO2022239160A1

WO2022239160A1 - User equipment and communication method

Info

Publication number: WO2022239160A1
Application number: PCT/JP2021/018109
Authority: WO
Inventors: 淳巳之口; 真央樹彦坂
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2022-11-17

Abstract

This user equipment comprises: a transmission unit that transmits, to a network, information indicating UE's usage setting; a reception unit that receives information indicating whether nor not IP Multimedia Subsystem (IMS) voice using Evolved Packet System Fallback (EPSFB) is supported and information indicating whether or not IMS voice using New Radio (NR) is supported; and a control unit that, on the basis of the information indicating whether nor not the IMS voice using EPSFB is supported and the information indicating whether or not the IMS voice using NR is supported, activates the capability of connecting to Evolved Packet Core (EPC) or 5G Core Network (5GC) and controls network selection.

Description

Terminal and communication method

The present invention relates to a terminal and communication method in a communication system.

In the 3GPP (3rd Generation Partnership Project), 5G or NR (New Radio) and NR (New Radio) are being used in order to further increase the system capacity, further increase the data transmission speed, and further reduce the delay in the wireless section. A wireless communication system called "5G" (hereinafter, the wireless communication system is referred to as "5G" or "NR") is under study. In 5G, various radio technologies are being studied in order to meet the requirements of realizing a throughput of 10 Gbps or more and keeping the delay in the radio section to 1 ms or less.

In NR, 5GC (5G Core Network) corresponding to EPC (Evolved Packet Core) which is the core network in LTE (Long Term Evolution) network architecture and E-UTRAN (RAN (Radio Access Network) in LTE network architecture ( A network architecture including NG-RAN (Next Generation-Radio Access Network) corresponding to Evolved Universal Terrestrial Radio Access Network) is under consideration (for example, Non-Patent Document 1).

A terminal that uses voice services in EPC or 5GC receives from the network an information element "IMS Voice over PS Session Supported Indication" that indicates whether IMS (IP Multimedia Subsystem) voice is supported. Here, if the terminal is a voice centric terminal, for example, if the EPC area is narrow in a network that provides IMS voice only with EPSFB (Evolved Packet System Fallback), or PNI (Public Network Integrated)- In the NPN (Non Public Network) area, etc., a response with "IMS Voice over PS Session Supported Indication" may be received as "No", and there is a risk of being unable to connect to the 5GC network.

The present invention has been made in view of the above points, and aims to reduce the occurrence of connection failures in a network.

According to the disclosed technique, a transmitting unit that transmits information indicating the usage pattern of the terminal to the network, information indicating whether to support IMS (IP Multimedia Subsystem) audio by EPSFB (Evolved Packet System Fallback), and NR ( A receiving unit that receives information indicating whether to support IMS audio by New Radio), information indicating whether to support IMS audio by EPSFB, and information indicating whether to support IMS audio by NR A terminal is provided having a control unit for activating connection capability to EPC (Evolved Packet Core) or 5GC (5G Core Network) and controlling network selection based on the information.

According to the disclosed technology, it is possible to reduce the occurrence of connection failures in the network.

1 is a diagram for explaining an example of a communication system; FIG. 1 is a diagram for explaining an example of a communication system in a roaming environment; FIG. FIG. 2 is a diagram for explaining an example of PNI-NPN; FIG. 4 is a sequence diagram for explaining an example of network connection operation according to the embodiment of the present invention; It is a figure showing an example of functional composition of base station 10 in an embodiment of the invention. 2 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention; FIG. 2 is a diagram showing an example of hardware configurations of base station 10 and terminal 20 according to an embodiment of the present invention; FIG.

Embodiments of the present invention will be described below with reference to the drawings. In addition, the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

Existing technologies are appropriately used for the operation of the wireless communication system according to the embodiment of the present invention. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, the term "LTE" used in this specification, unless otherwise specified, has a broad meaning including LTE-Advanced and LTE-Advanced and later systems (eg: NR), or wireless LAN (Local Area Network). shall have

Further, in the embodiment of the present invention, "configuring" the wireless parameters and the like may mean that predetermined values are set in advance (pre-configure), or the network node 30 or A wireless parameter notified from the terminal 20 may be set.

FIG. 1 is a diagram for explaining an example of a communication system. As shown in FIG. 1 , a communication system consists of a UE, which is a terminal 20 , and a plurality of network nodes 30 . Hereinafter, one network node 30 corresponds to each function, but one network node 30 may realize a plurality of functions, or a plurality of network nodes 30 may realize one function. . Also, the "connection" described below may be a logical connection or a physical connection.

A RAN (Radio Access Network) is a network node 30 having a radio access function, may include a base station 10, and is connected with a UE, an AMF (Access and Mobility Management Function) and a UPF (User plane function). The AMF is a network node 30 having functions such as RAN interface termination, NAS (Non-Access Stratum) termination, registration management, connection management, reachability management, and mobility management. The UPF is a network node 30 that has functions such as a PDU (Protocol Data Unit) session point to the outside that interconnects with a DN (Data Network), packet routing and forwarding, and user plane QoS (Quality of Service) handling. UPF and DN constitute a network slice. A plurality of network slices are constructed in the wireless communication network according to the embodiment of the present invention.

AMF is UE, RAN, SMF (Session Management function), NSSF (Network Slice Selection Function), NEF (Network Exposure Function), NRF (Network Repository Function), UDM (Unified Data Management), AUSF (Authentication Server Function), PCF (Policy Control Function) and AF (Application Function) are connected. AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, AF are interconnected via respective service-based interfaces Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, Naf. network node 30 .

The SMF is a network node 30 that has functions such as session management, UE IP (Internet Protocol) address allocation and management, DHCP (Dynamic Host Configuration Protocol) function, ARP (Address Resolution Protocol) proxy, and roaming function. A NEF is a network node 30 that has the function of notifying other NFs (Network Functions) of capabilities and events. NSSF selects the network slice to which the UE connects, determines the allowed NSSAI (Network Slice Selection Assistance Information), determines the NSSAI to be set, determines the AMF set to which the UE connects. be. A PCF is a network node 30 having a function of performing network policy control. AF is a network node 30 having the function of controlling an application server. An NRF is a network node 30 that has the ability to discover NF instances that provide services. A UDM is a network node 30 that manages subscriber data and authentication data. The UDM is connected to a UDR (User Data Repository) that holds the data.

FIG. 2 is a diagram for explaining an example of a communication system in a roaming environment. As shown in FIG. 2, the network consists of a UE, which is a terminal 20 , and a plurality of network nodes 30 . Hereinafter, one network node 30 corresponds to each function, but one network node 30 may realize a plurality of functions, or a plurality of network nodes 30 may realize one function. . Also, the "connection" described below may be a logical connection or a physical connection.

RAN is a network node 30 with radio access functionality and is connected with UE, AMF and UPF. The AMF is a network node 30 having functions such as RAN interface termination, NAS termination, registration management, connection management, reachability management, and mobility management. A UPF is a network node 30 that has functions such as PDU session point to the outside world interconnecting DNs, packet routing and forwarding, user plane QoS handling, and so on. UPF and DN constitute a network slice. A plurality of network slices are constructed in the wireless communication network according to the embodiment of the present invention.

AMF is connected to UE, RAN, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, AF, and SEPP (Security Edge Protection Proxy). AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, AF are interconnected via respective service-based interfaces Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, Naf. network node 30 .

The SMF is a network node 30 that has functions such as session management, UE IP address allocation and management, DHCP function, ARP proxy, roaming function, and the like. A NEF is a network node 30 that has the function of notifying other NFs of capabilities and events. The NSSF is a network node 30 that has functions such as selecting a network slice to which the UE connects, determining allowed NSSAIs, determining configured NSSAIs, determining the AMF set to which the UE connects, and so on. A PCF is a network node 30 having a function of performing network policy control. AF is a network node 30 having the function of controlling an application server. An NRF is a network node 30 that has the ability to discover NF instances that provide services. SEPP is a non-transparent proxy that filters control plane messages between PLMNs (Public Land Mobile Networks). The vSEPP shown in FIG. 2 is the SEPP in the visited network, and the hSEPP is the SEPP in the home network.

As shown in FIG. 2, the UE is in a roaming environment connected with RAN and AMF in VPLMN (Visited PLMN). VPLMN and HPLMN (Home PLMN) are connected via vSEPP and hSEPP. The UE can, for example, communicate with the HPLMN's UDM via the VPLMN's AMF.

Terminals that use voice services in EPC (Evolved Packet Core) or 5GC (5G Core Network) transmit the information element "IMS Voice over PS Session Supported Indication" to the network to indicate whether they support IMS (IP Multimedia Subsystem) voice receive from Here, if the terminal is a voice centric terminal, for example, if the EPC area is narrow in a network that provides IMS voice only with EPSFB (Evolved Packet System Fallback), or PNI (Public Network Integrated)- In the NPN (Non Public Network) area, etc., a response with "IMS Voice over PS Session Supported Indication" may be received as "No", and there is a risk of being unable to connect to the 5GC network.

For example, regarding the coverage environment, assume that there are 2G or 3G areas, only a few EPC areas, and 5GC areas are expanding. Voice services are provided by 2G or 3G CS (Circuit Switching) and also IMS voice by EPSFB (Evolved Packet System Fallback).

Here, since the EPC area is small, failure to attach multiple times is likely to cause S1 disable, in which connection to the EPC cannot be established. When S1 disable occurs, the network transmits "IMS Voice over PS Session Supported Indication" to terminal 20 as "No", so voice-centric terminals may be in a state where connection to 5GC cannot be established due to N1 disable. Occur.

As another example, assume the introduction of PNI-NPN without IMS voice services. FIG. 3 is a diagram for explaining an example of PNI-NPN. In PNI-NPN, private network base stations are built as part of the operator's 5G public network. As shown in FIG. 3, PNI-NPN is a network architecture that accommodates the NPN in the same network as the core network that accommodates the public network. CAG (Closed Access Group) is applied to access control, and the terminal 20 has a CAG-ID (XXX in FIG. 3) transmitted from the communication cell by broadcast information, and an accessible CAG set and held on the terminal 20 side. - Checking with the list of IDs to determine whether or not there is an access right, and then trying to access the cell. On the other hand, from the terminal 20 (PNUE in FIG. 3) for which the CAG-ID is not set, the cell is recognized as an inaccessible Barred cell and is not subject to cell selection. The same PLMNID (aaa in FIG. 3) as that of the public network is set for the NPNUE located in the PNI-NPN, and it is possible to allow access to the public network.

Here, since PNI-NPN uses dedicated AMF and SMF, it does not provide IMS voice. When the terminal 20 tries to connect to PNI-NPN, the network sends "IMS Voice over PS Session Supported Indication" to the terminal 20 as "No", so the voice-centric terminal cannot establish a connection to 5GC. An N1 disable condition occurs.

Also, "UE's usage setting", which is set to "voice-centric", etc., transmitted from the terminal 20 cannot be controlled from the network.

For example, in PNI-NPN without IMS voice service, by changing "UE's usage setting" to "data centric" on the UE side, "IMS Voice over PS Session Supported Indication" is received as "No" can be avoided. However, it cannot solve the situation where S1 disable occurs in the above coverage environment.

Therefore, the network may newly transmit "EPSFB IMS voice supported" and "NR IMS voice supported" to the terminal 20.

For example, if the network provides IMS voice only in EPSFB, regardless of the state of the terminal 20, the network sets "EPSFB IMS voice supported" = "Yes" and "NR IMS voice supported" = "No" to the terminal 20. may be sent to

For example, when the network provides IMS voice only in NR, regardless of the state of the terminal 20, the network sets "EPSFB IMS voice supported" = "No" and "NR IMS voice supported" = "Yes" to the terminal 20. may be sent to

For example, when the network provides IMS voice in EPSFB and NR, regardless of the state of the terminal 20, the network sets "EPSFB IMS voice supported" = "Yes" and "NR IMS voice supported" = "Yes" to the terminal. 20 may be sent.

For example, in an environment where the network provides IMS voice on both EPSFB and NR as a public network, if the Allowed NSSAI (Network Slice Selection Assistance Information) of the terminal 20 is all PNI-NPN, only the terminal 20 , "EPS FB IMS voice supported" = "No due to PNI-NPN restriction", "NR IMS voice supported" = "No due to PNI-NPN restriction". A terminal 20 receiving this information element can assume that IMS voice is not provided due to PNI-NPN restrictions.

The above network may be EPC or 5GC.

Also, regarding the terminal 20, a sub-parameter "NR preferred" may be set in "UE's usage setting".

For example, "UE's usage setting" = "voice centric", and the sub-parameter may be "NR preferred". When the terminal 20 sets the "UE's usage setting" and sub-parameters, and when the network does not transmit "EPSFB IMS voice supported" and "NR IMS voice supported", the terminal 20 sets "voice centric" may work. On the other hand, when the terminal 20 sets the "UE's usage setting" and sub-parameters, and when the network transmits "EPSFB IMS voice supported" and "NR IMS voice supported", the terminal 20 uses the conventional "IMS Voice over PS Session Supported Indication" may be ignored.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and the sub-parameter is set to "NR preferred", and "EPSFB IMS voice supported" = "Yes" and "NR IMS voice supported"="No", the terminal 20 may operate as in 1)-3) shown below.

1) In the case of S1 enable and N1 disable, it may remain in EPC/LTE.
2) If S1 disabled and N1 enabled, release S1 disable and may remain in 5GS/NR.
3) If S1 enabled and N1 enabled, then the current location may remain.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and sub-parameters to "NR preferred", and when "EPSFB IMS voice supported" = "No" and "NR IMS voice supported"="Yes", the terminal 20 may operate as in 1)-3) shown below.

1) In the case of S1 enabled and N1 disabled, the N1 disabled may be released and 5GS/NR may be served.
2) If S1 disabled and N1 enabled, it may remain on 5GS/NR.
3) May be on 5GS/NR if S1 enabled and N1 enabled.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and the sub-parameter is set to "NR preferred", and "EPSFB IMS voice supported" = "Yes" and "NR IMS voice supported"="Yes", the terminal 20 may operate as in 1)-3) shown below.

1) In the case of S1 enabled and N1 disabled, the N1 disabled may be released and 5GS/NR may be served.
2) If S1 disabled and N1 enabled, it may remain on 5GS/NR.
3) If S1 enabled and N1 enabled, then the current location may remain.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and sub-parameters to "NR preferred", and when "EPSFB IMS voice supported" = "No" and "NR IMS voice supported"="No", the terminal 20 may operate as in 1)-3) shown below.

1) When S1 is enabled and N1 is disabled, S1 may be disabled.
2) When S1 is disabled and N1 is enabled, N1 may be disabled.
3) In the case of S1 enable and N1 enable, it may be S1 disable and N1 disable.

As described above, the terminal 20 may activate or deactivate the ability to connect to EPC or 5GC based on "EPSFB IMS voice supported" and "NR IMS voice supported".

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and the sub-parameter is set to "NR preferred", and "EPSFB IMS voice supported" = "Node to PNI-NPN restriction" from the network and "NR IMS voice supported" = "No due to PNI-NPN restriction", the terminal 20 may change the Requested NSSAI and perform the registration procedure again.

Also, regarding the terminal 20, a sub-parameter "PNI-NPN precedence" may be set in "UE's usage setting".

For example, "UE's usage setting" = "voice centric", and the sub-parameters may be "NR preferred" and "PNI-NPN precedence". When the terminal 20 sets the "UE's usage setting" and sub-parameters, and when the network does not transmit "EPSFB IMS voice supported" and "NR IMS voice supported", the terminal 20 sets "voice centric" may work. On the other hand, when the terminal 20 sets the "UE's usage setting" and sub-parameters, and when the network transmits "EPSFB IMS voice supported" and "NR IMS voice supported", the terminal 20 uses the conventional "IMS Voice over PS Session Supported Indication" may be ignored.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and sub-parameters to "NR preferred" and "PNI-NPN precedence", and when the terminal 20 sets "EPSFB IMS voice supported" = " If the terminal 20 receives "Yes" and "NR IMS voice supported" = "No", it may operate as in 1)-3) shown below.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and sub-parameters to "NR preferred" and "PNI-NPN precedence", and when the terminal 20 sets "EPSFB IMS voice supported" = " No" and "NR IMS voice supported" = "Yes", the terminal 20 may operate as in 1)-3) shown below.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and sub-parameters to "NR preferred" and "PNI-NPN precedence", and when the terminal 20 sets "EPSFB IMS voice supported" = " Yes" and "NR IMS voice supported" = "Yes", the terminal 20 may operate as in 1)-3) shown below.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and sub-parameters to "NR preferred" and "PNI-NPN precedence", and when the terminal 20 sets "EPSFB IMS voice supported" = " No" and "NR IMS voice supported" = "No", the terminal 20 may operate as in 1)-3) shown below.

In addition, when the terminal 20 sets "UE's usage setting" = "voice centric" and sub-parameters to "NR preferred" and "PNI-NPN precedence", and when the terminal 20 sets "EPSFB IMS voice supported" = " If the terminal 20 receives "No due to PNI-NPN restriction" and "NR IMS voice supported" = "No due to PNI-NPN restriction", the terminal 20 may remain in the current RAT.

In addition, the HPLMN changes or It may be configurable.

FIG. 4 is a sequence diagram for explaining an example of network connection operation according to the embodiment of the present invention. In step S11, the UE 20 transmits "UE's usage setting" to the NW10. As mentioned above, "UE's usage setting" may be accompanied by sub-parameters. In subsequent step S12, the NW 10 transmits "EPSFB IMS voice supported" = "Yes" or "No" and "NR IMS voice supported" = "Yes" or "No" to the UE 20. As described above, "EPSFB IMS voice supported" and/or "NR IMS voice supported" may be set to "No due to PNI-NPN restriction". In the following step S13, the UE 20 performs network selection as described above. Note that the NW 10 may be a base station or a node of a core network.

According to the above-described embodiment, the network notifies the terminal 20 of the IMS voice provision capability for each type such as EPSFB, NR, PNI-NPN, etc., and avoids connection failure to the network due to inconsistency in the IMS voice provision capability. be able to. In addition to being voice-centric, the terminal 20 can smoothly enter a desired system by notifying the network of sub-parameters such as NR priority and PNI-NPN priority.

In other words, it is possible to reduce the occurrence of connection failures in the network.

(Device configuration)
Next, functional configuration examples of the base station 10, the network node 30, and the terminal 20 that perform the processes and operations described above will be described. The base station 10, network node 30 and terminal 20 include functionality to implement the embodiments described above. However, each of the base station 10, network node 30, and terminal 20 may have only part of the functions in the embodiments.

<Base station 10 and network node 30>
FIG. 5 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. As shown in FIG. 5, the base station 10 has a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140. The functional configuration shown in FIG. 5 is merely an example. As long as the operation according to the embodiment of the present invention can be performed, the functional division and the names of the functional units may be arbitrary. Note that the network node 30 may have a functional configuration similar to that of the base station 10 . Also, the network node 30 having multiple different functions on the system architecture may be composed of multiple network nodes 30 separated for each function.

The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 or another network node 30 and transmitting the signal by wire or wirelessly. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 or other network nodes 30 and acquiring, for example, higher layer information from the received signals.

The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in the storage device, and reads them from the storage device as necessary. The contents of the setting information are, for example, settings related to IMS voice in the network.

The control unit 140 performs processing related to IMS voice in the network, as described in the embodiment. Also, the control unit 140 performs processing related to communication with the terminal 20 . A functional unit related to signal transmission in control unit 140 may be included in transmitting unit 110 , and a functional unit related to signal reception in control unit 140 may be included in receiving unit 120 .

<Terminal 20>
FIG. 6 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. As shown in FIG. 6, the terminal 20 has a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240. The functional configuration shown in FIG. 6 is merely an example. As long as the operation according to the embodiment of the present invention can be performed, the functional division and the names of the functional units may be arbitrary.

The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. The receiving unit 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, reference signals, etc. transmitted from the network node 30 .

The setting unit 230 stores various types of setting information received from the network node 30 by the receiving unit 220 in the storage device, and reads them from the storage device as necessary. The setting unit 230 also stores preset setting information. The contents of the setting information are, for example, settings related to IMS voice.

The control unit 240 performs processing related to connection control to networks and network slices, as described in the embodiments. A functional unit related to signal transmission in control unit 240 may be included in transmitting unit 210 , and a functional unit related to signal reception in control unit 240 may be included in receiving unit 220 .

(Hardware configuration)
The block diagrams (FIGS. 5 and 6) used to describe the above embodiments show blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices. A functional block may be implemented by combining software in the one device or the plurality of devices.

Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the network node 30, the terminal 20, etc. according to the embodiment of the present disclosure may function as computers that perform processing of the wireless communication method of the present disclosure. FIG. 7 is a diagram illustrating an example of hardware configurations of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The network node 30 may have hardware configuration similar to that of the base station 10 . The base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. good too.

In the following explanation, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the base station 10 and terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.

Each function of the base station 10 and the terminal 20 is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002. or by controlling at least one of data reading and writing in the storage device 1002 and the auxiliary storage device 1003 .

The processor 1001, for example, operates an operating system and controls the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the control unit 140 , the control unit 240 and the like described above may be implemented by the processor 1001 .

In addition, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, control unit 140 of base station 10 shown in FIG. 5 may be implemented by a control program stored in storage device 1002 and operated by processor 1001 . Also, for example, the control unit 240 of the terminal 20 shown in FIG. Although it has been explained that the above-described various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.

The storage device 1002 is a computer-readable recording medium, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured. The storage device 1002 may also be called a register, cache, main memory (main storage device), or the like. The storage device 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu -ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like. The storage medium described above may be, for example, a database, server, or other suitable medium including at least one of storage device 1002 and secondary storage device 1003 .

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD). may consist of For example, a transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission line interface, etc. may be implemented by the communication device 1004 . The transceiver may be physically or logically separate implementations for the transmitter and receiver.

The input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

In addition, the base station 10 and the terminal 20 include hardware such as microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), and FPGAs (Field Programmable Gate Arrays). , and part or all of each functional block may be implemented by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

(Summary of embodiment)
As described above, according to the embodiment of the present invention, a transmission unit that transmits information indicating the usage pattern of the terminal to the network and IMS (IP Multimedia Subsystem) audio by EPSFB (Evolved Packet System Fallback) are supported. A receiving unit that receives information indicating whether to support IMS audio by NR (New Radio) and information indicating whether to support IMS audio by EPSFB, and information indicating whether to support IMS audio by the EPSFB and by the NR A terminal having a control unit for activating connection capability to EPC (Evolved Packet Core) or 5GC (5G Core Network) and controlling network selection based on information indicating whether to support IMS voice is provided. be.

With the above configuration, the network notifies the terminal 20 of the IMS voice provision capability for each type such as EPSFB, NR, PNI-NPN, etc., and avoids connection failure to the network due to a mismatch in the IMS voice provision capability. can be done. In addition to being voice-centric, the terminal 20 can smoothly enter a desired system by notifying the network of sub-parameters such as NR priority and PNI-NPN priority. That is, it is possible to reduce the occurrence of connection failures in the network.

The transmission unit may include information indicating NR priority in addition to voice-centricity in the information indicating the usage pattern of the terminal. With this configuration, in addition to being voice-centric, the terminal 20 notifies the network of sub-parameters such as NR priority and PNI-NPN priority, so that the terminal 20 can smoothly enter a desired system. can.

When the transmission unit includes information indicating NR priority in addition to voice-centricity in the information indicating the usage pattern of the terminal, the control unit determines whether IMS voice is supported in a PS (Packet Switching) session You may ignore the information indicating whether or not. With this configuration, in addition to being voice-centric, the terminal 20 notifies the network of sub-parameters such as NR priority and PNI-NPN priority, so that the terminal 20 can smoothly enter a desired system. can.

The transmission unit may include information indicating PNI (Public Network Integrated)-NPN (Non Public Network) priority in addition to voice-centric information in the information indicating the usage pattern of the terminal. With this configuration, in addition to being voice-centric, the terminal 20 notifies the network of sub-parameters such as NR priority and PNI-NPN priority, so that the terminal 20 can smoothly enter a desired system. can.

The receiving unit acquires information indicating that it is not supported because it is PNI-NPN from the information indicating whether to support IMS audio by EPSFB and the information indicating whether to support IMS audio by NR. You may With this configuration, the network notifies the terminal 20 of the IMS voice provision capability for each type such as EPSFB, NR, PNI-NPN, etc., and avoids connection failure to the network due to a mismatch in the IMS voice provision capability. can.

The information indicating the usage pattern of the terminal may be set by HPLMN (Home Public Land Mobile Network) based on subscriber information. With this configuration, the network can set an appropriate "UE's usage setting" for the terminal 20 and avoid connection failure to the network due to inconsistency in IMS voice provision capability.

Further, according to the embodiment of the present invention, a transmission procedure for transmitting information indicating the usage pattern of the terminal to the network, and whether or not to support IMS (IP Multimedia Subsystem) audio by EPSFB (Evolved Packet System Fallback) Reception procedure for receiving information indicating whether to support IMS audio by NR (New Radio) and information indicating whether to support IMS audio by EPSFB and IMS audio by NR A communication method is provided in which the terminal executes a control procedure for activating the ability to connect to EPC (Evolved Packet Core) or 5GC (5G Core Network) and controlling network selection based on information indicating whether or not .

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art can understand various modifications, modifications, alternatives, replacements, and the like. be. Although specific numerical examples have been used to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The division of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be used in another item. may apply (unless inconsistent) to the matters set forth in Boundaries of functional or processing units in functional block diagrams do not necessarily correspond to boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. As for the processing procedures described in the embodiments, the processing order may be changed as long as there is no contradiction. Although the network node 30 and terminal 20 have been described using functional block diagrams for convenience of process description, such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the network node 30 according to the embodiment of the invention and the software operated by the processor of the terminal 20 according to the embodiment of the invention are respectively stored in random access memory (RAM), flash memory, read-only memory. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.

Also, notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.In addition, RRC signaling may also be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.

Each aspect/embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system) system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems and extended It may be applied to at least one of the next generation systems. Also, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.

A specific operation performed by the network node 30 in this specification may be performed by its upper node in some cases. In a network of one or more network nodes, including network node 30, various operations performed for communication with terminal 20 may be network node 30 and other network nodes other than network node 30 ( (eg, but not limited to MME or S-GW). Although the above example illustrates the case where there is one network node other than the network node 30, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). .

Information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.

Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.

The determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), may be performed by a boolean value (Boolean: true or false), or may be performed by comparing numerical values (e.g. , comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) to website, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of

The terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, the channel and/or symbols may be signaling. A signal may also be a message. A component carrier (CC) may also be called a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indexed.

The names used for the parameters described above are not restrictive names in any respect. Further, the formulas, etc., using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in no way restrictive names. is not.

In the present disclosure, "base station (BS)", "radio base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission/reception point", "cell", "sector", Terms such as "cell group," "carrier," and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.

A base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH: The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems serving communication services in this coverage. point to

In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably. .

A mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like. The mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Also, the base station in the present disclosure may be read as a user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the terminal 20 may have the functions of the network node 30 described above. Also, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be read as side channels.

Similarly, user terminals in the present disclosure may be read as base stations. In this case, the base station may have the functions that the above-described user terminal has.

The terms "determining" and "determining" used in this disclosure may encompass a wide variety of actions. "Judgement" and "determination" are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as "judged" or "determined", and the like. Also, "judgment" and "determination" are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment" or "decision" has been made. In addition, "judgment" and "decision" are considered to be "judgment" and "decision" by resolving, selecting, choosing, establishing, comparing, etc. can contain. In other words, "judgment" and "decision" may include considering that some action is "judgment" and "decision". Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", or the like.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being "connected" or "coupled." Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in this disclosure, two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.

The reference signal can also be abbreviated as RS (Reference Signal), and may also be called Pilot depending on the applicable standard.

The term "based on" as used in this disclosure does not mean "based only on" unless otherwise specified. In other words, the phrase "based on" means both "based only on" and "based at least on."

Any reference to elements using the "first," "second," etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.

"Means" in the configuration of each device described above may be replaced with "unit", "circuit", "device", or the like.

Where "include," "including," and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising." is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

In this disclosure, if articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. In addition, the notification of predetermined information (for example, notification of “being X”) is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.

Note that UE's usage setting in the present disclosure is an example of information indicating the usage pattern of the terminal. "EPSFB IMS voice supported" is an example of information indicating whether or not IMS voice by EPSFB is supported. "NR IMS voice supported" is an example of information indicating whether IMS voice by NR is supported. "NR preferred" is an example of information indicating NR priority. "PNI-NPN precedence" is an example of information indicating PNI-NPN precedence. "IMS voice over PS Session supported indication" is an example of information indicating whether or not IMS voice is supported in a PS session. "No due to PNI-NPN restriction" is an example of information indicating that PNI-NPN is not supported.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be practiced with modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not meant to be limiting in any way.

10 base station 110 transmitting unit 120 receiving unit 130 setting unit 140 control unit 20 terminal 210 transmitting unit 220 receiving unit 230 setting unit 240 control unit 30 network node 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

Claims

a transmission unit that transmits information indicating the usage pattern of the terminal to the network;
a receiver that receives information indicating whether to support IMS (IP Multimedia Subsystem) audio by EPSFB (Evolved Packet System Fallback) and information indicating whether to support IMS audio by NR (New Radio);
Ability to connect to EPC (Evolved Packet Core) or 5GC (5G Core Network) based on information indicating whether to support IMS audio by EPSFB and information indicating whether to support IMS audio by NR and a controller for activating and controlling network selection.
　The terminal according to claim 1, wherein the transmitting unit includes information indicating NR priority in addition to voice-centric information in the information indicating the usage pattern of the terminal.
When the transmission unit includes information indicating NR priority in addition to voice-centricity in the information indicating the usage pattern of the terminal, the control unit determines whether IMS voice is supported in a PS (Packet Switching) session 3. The terminal according to claim 2, which ignores information indicating whether or not.
The terminal according to claim 1, wherein the transmission unit includes information indicating PNI (Public Network Integrated)-NPN (Non Public Network) priority in addition to voice-centric information in the information indicating the usage pattern of the terminal.
The receiving unit acquires information indicating that it is not supported because it is PNI-NPN from the information indicating whether to support IMS audio by EPSFB and the information indicating whether to support IMS audio by NR. The terminal according to claim 1.
The terminal according to claim 1, wherein the information indicating the usage pattern of the terminal is set based on subscriber information by HPLMN (Home Public Land Mobile Network).
a transmission procedure for transmitting information indicating the usage pattern of the terminal to the network;
A reception procedure for receiving information indicating whether to support IMS (IP Multimedia Subsystem) audio by EPSFB (Evolved Packet System Fallback) and information indicating whether to support IMS audio by NR (New Radio);
Ability to connect to EPC (Evolved Packet Core) or 5GC (5G Core Network) based on information indicating whether to support IMS audio by EPSFB and information indicating whether to support IMS audio by NR and control procedures for activating network selection and controlling network selection.