WO2024171359A1 - ネットワークノード及び通信方法 - Google Patents
ネットワークノード及び通信方法 Download PDFInfo
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- WO2024171359A1 WO2024171359A1 PCT/JP2023/005341 JP2023005341W WO2024171359A1 WO 2024171359 A1 WO2024171359 A1 WO 2024171359A1 JP 2023005341 W JP2023005341 W JP 2023005341W WO 2024171359 A1 WO2024171359 A1 WO 2024171359A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0457—Variable allocation of band or rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
Definitions
- the present invention relates to a network node and a communication method in a communication system.
- 5G Fifth Generation Partnership Project
- 5G New Radio
- 5G 5G
- various wireless technologies are being studied to meet the requirements of achieving a throughput of 10 Gbps or more while keeping latency in wireless sections to 1 ms or less.
- NR is considering a network architecture including 5GC (5G Core Network), which corresponds to EPC (Evolved Packet Core), the core network in the network architecture of LTE (Long Term Evolution), and NG-RAN (Next Generation-Radio Access Network), which corresponds to E-UTRAN (Evolved Universal Terrestrial Radio Access Network), the RAN (Radio Access Network) in the network architecture of LTE (for example, non-patent document 1).
- 5GC 5G Core Network
- EPC Evolved Packet Core
- LTE Long Term Evolution
- NG-RAN Next Generation-Radio Access Network
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- the RAN Radio Access Network
- DC Dual Connectivity
- the MN Master node
- the MN takes the initiative in allocating terminal wireless capabilities between MN-SN via interface Xn, and in allocating wireless resources when frequencies are shared between MN-SN.
- processing related to the allocation of wireless resources is necessary.
- the present invention has been made in consideration of the above points, and aims to perform wireless resource allocation in a wireless communication system in which two base stations both operate as master nodes.
- a network node has a communication unit that receives a registration request including information indicating the use of two master nodes from a terminal via a RAN (Radio Access Network) node, and a control unit that holds a total of two terminal contexts for each master node, the control unit holds a master node identifier corresponding to the RAN node, residual terminal radio capabilities, and residual terminal radio resources in the terminal context for each master node, the control unit derives two CM (Connection management) states of the terminal based on the terminal context for each master node, and the communication unit notifies the other of the two master nodes of the residual terminal radio capabilities and residual terminal radio resources included in the terminal context for each master node corresponding to one of the two master nodes.
- CM Connection management
- the disclosed technology makes it possible to allocate wireless resources in a wireless communication system in which two base stations both operate as master nodes.
- FIG. 1 is a diagram illustrating an example of a communication system.
- FIG. 1 is a diagram for explaining an example of a communication system in a roaming environment.
- FIG. 1 is a diagram for explaining an example of a network according to an embodiment of the present invention.
- FIG. 4 is a sequence diagram illustrating an example of initial setting and setting change according to an embodiment of the present invention.
- FIG. 11 is a sequence diagram for explaining an example of cell selection in the embodiment of the present invention.
- FIG. 11 is a sequence diagram illustrating an example of a registration procedure according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating an example of a functional configuration of a base station 10 and a network node 30 according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to an embodiment of the present invention.
- 2 is a diagram illustrating an example of a hardware configuration of a base station 10 and a terminal 20 according to an embodiment of the present invention.
- FIG. 2 is a diagram showing an example of the configuration of a vehicle 2001 according to an embodiment of the present invention.
- LTE Long Term Evolution
- NR Universal Terrestrial Radio Access
- LAN Local Area Network
- “configuring" wireless parameters etc. may mean that predetermined values are pre-configured, or that wireless parameters notified from the network node 30 or the terminal 20 are configured.
- FIG. 1 is a diagram for explaining an example of a communication system.
- the communication system is composed of a UE, which is a terminal 20, and multiple network nodes 30.
- a UE which is a terminal 20
- multiple network nodes 30 it is assumed that one network node 30 corresponds to each function, but multiple functions may be realized by one network node 30, or multiple network nodes 30 may realize one function.
- the "connection" described below may be a logical connection or a physical connection.
- the RAN Radio Access Network
- the RAN is a network node 30 having a radio access function, which may include a base station 10, and is connected to 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 having 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.
- the UPF and DN constitute a network slice. In the wireless communication network in the embodiment of the present invention, multiple network slices are constructed.
- the AMF is connected to the 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).
- the AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, and AF are network nodes 30 that are interconnected via interfaces based on their respective services: Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.
- the SMF is a network node 30 having functions such as session management, IP (Internet Protocol) address allocation and management for UEs, DHCP (Dynamic Host Configuration Protocol) function, ARP (Address Resolution Protocol) proxy, and roaming function.
- the NEF is a network node 30 having a function of notifying other NFs (Network Functions) of capabilities and events.
- the NSSF is a network node 30 having functions such as selecting a network slice to which the UE will connect, determining an allowed NSSAI (Network Slice Selection Assistance Information), determining an NSSAI to be set, and determining an AMF set to which the UE will connect.
- the PCF is a network node 30 having a function of controlling network policies.
- the AF is a network node 30 having a function of controlling application servers.
- the NRF is a network node 30 having a function of discovering NF instances that provide services.
- the UDM is a network node 30 that manages subscriber data and authentication data.
- the UDM is connected to a User Data Repository (UDR) that holds the data.
- UDR User Data Repository
- FIG. 2 is a diagram for explaining an example of a communication system in a roaming environment.
- the network is composed of a UE, which is a terminal 20, and multiple network nodes 30.
- a UE which is a terminal 20
- multiple network nodes 30 it is assumed that one network node 30 corresponds to each function, but multiple functions may be realized by one network node 30, or multiple network nodes 30 may realize one function.
- the "connection" described below may be a logical connection or a physical connection.
- the RAN is a network node 30 with radio access functionality, and is connected to the UE, AMF, and UPF.
- the AMF is a network node 30 with functionality such as RAN interface termination, NAS termination, registration management, connection management, reachability management, and mobility management.
- the UPF is a network node 30 with functionality such as a PDU session point to the outside that interconnects with the DN, packet routing and forwarding, and user plane QoS handling.
- the UPF and DN constitute a network slice. In the wireless communication network in the embodiment of the present invention, multiple network slices are constructed.
- the AMF is connected to the UE, RAN, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, AF, and SEPP (Security Edge Protection Proxy).
- the AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, and AF are network nodes 30 that are interconnected via interfaces based on their respective services: Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.
- the SMF is a network node 30 having functions such as session management, UE IP address allocation and management, DHCP function, ARP proxy, and roaming function.
- the NEF is a network node 30 having a function of notifying other NFs of capabilities and events.
- the NSSF is a network node 30 having functions such as selecting a network slice to which the UE will connect, determining an allowed NSSAI, determining an NSSAI to be configured, and determining an AMF set to which the UE will connect.
- the PCF is a network node 30 having a function of performing network policy control.
- the AF is a network node 30 having a function of controlling application servers.
- the NRF is a network node 30 having a function of discovering NF instances that provide services.
- the SEPP is a non-transparent proxy that filters control plane messages between PLMNs (Public Land Mobile Networks).
- the vSEPP shown in Figure 2 is a SEPP in the visited network, and the hSE
- the UE is in a roaming environment connected to the RAN and AMF in the VPLMN (Visited PLMN).
- the VPLMN and the HPLMN (Home PLMN) are connected via vSEPP and hSEPP.
- the UE can communicate with the UDM of the HPLMN, for example, via the AMF of the VPLMN.
- DC Dual Connectivity
- Dual registration was also specified as a 5G transition method.
- the introduction of dual registration was aimed at resolving the interoperability between EPC and E-UTRA and 5GC and NR in the absence of N26 (see Non-Patent Document 1), which is the interface between AMF and MME.
- N26 is the interface between AMF and MME.
- 5GC and E-UTRA are configured, dual registration did not provide a sufficient solution to the issue of registering to both EPC and 5GC via the same E-UTRA cell. Therefore, if the next-generation core network is an extension of 5GC, dual registration specified in the 5G transition method cannot be reused.
- next-generation core network will be an expansion of 5GC
- a method that does not use DC while achieving stabilization of coverage in the initial stage of the introduction of the next-generation wireless system is desirable, but such a method does not currently exist.
- FIG. 3 is a diagram for explaining an example of a network in an embodiment of the present invention.
- the terminal has two RRC (Radio Resource Control) states, two CM (Connection management) states, and one registration state (RM (Registration management) state).
- the QoS flow may be distributed or divided between the two MNs.
- the cells used for waiting and paging may be limited.
- the two MNs may recognize each other via the AMF and select an appropriate destination MN at the time of handover.
- the states RM-DEREGISTERED and RM-REGISTERED are defined.
- the terminal and the AMF each have an RM state.
- the transition of the RM state is based on the NAS signal.
- an RM state is defined for each access, which is independent of each other.
- An access is, for example, 3GPP access, non-3GPP access, etc.
- the states CM-IDLE and CM-CONNECTED are defined.
- the terminal and AMF each have a CM state.
- the transition of the CM state is based on the RRC signal for the terminal and the N2 signal, which is the interface with the RAN, for the AMF.
- a mutually independent CM state is defined for each access.
- An access is, for example, 3GPP access, non-3GPP access, etc.
- ATSSS Access Traffic Steering, Switching, Splitting
- the AMF may manage one RM state and two CM states for the 3GPP access of the terminal.
- the AMF may hold an MN identifier, a Global RAN Node ID (see Non-Patent Document 1), a RAN UE NGAP (NG Application Protocol) ID (see Non-Patent Document 2), and an AMF UE NGAP ID (see Non-Patent Document 2) in each of the two newly introduced MN-level terminal contexts, rather than in each access-level terminal context.
- the AMF may use the MN-level terminal context for message routing between the RAN and the SMF, K gNB (see Non-Patent Document 3) differentiation, derivation of the CM state of each connection, and derivation of the UE-CM state indicating terminal reachability.
- the terminal may manage one RM state and two CM states for 3GPP access.
- the RAN UE NGAP ID is an identifier that identifies a UE on an NG interface in a RAN node
- the AMF UE NGAP ID is an identifier that identifies a UE on an NG interface in an AMF.
- the SMF may allocate QoS flows of a PDU session among multiple MNs.
- the SMF may notify the RAN of a policy and allocate QoS flows of a PDU session among multiple MNs based on the decision of the RAN.
- the SMF may request the terminal to transmit a PDU session change request from another MN to an existing PDU session of 3GPP access.
- the RAN may determine QoS flow distribution and QoS flow division of the PDU session based on the policy notified by the SMF.
- the terminal may transmit a PDU session change request from a second MN to an existing PDU session of 3GPP access based on an instruction notified by the SMF.
- the RAN may set paging active or paging inactive.
- Paging inactive indicates that the RAN node does not perform paging.
- the RAN may notify the terminal of the information using broadcast information and notify the AMF of the information using a terminal-independent N2 message.
- the AMF may not transmit paging via N2 to the paging inactive RAN.
- the terminal may not set a cell of a paging inactive RAN as a candidate for cell selection and cell reselection.
- the terminal may further set a cell of a paging inactive RAN as a candidate for cell selection or cell reselection.
- the RAN may preferentially select that RAN as the handover destination.
- the RAN may preferentially select that RAN as the handover destination.
- the RAN may select the above handover destination based on information related to the buddy RAN node notified by the AMF.
- the AMF may notify the RAN of information related to the buddy node.
- the AMF may notify the RAN of information related to the buddy node when the two MNs transition to CM-connection.
- FIG. 4 is a sequence diagram for explaining an example of initial settings and setting changes in an embodiment of the present invention.
- the RAN node 10A transmits an NG SETUP REQUEST to the AMF 30A (see non-patent document 2).
- the AMF 30A transmits an NG SETUP RESPONSE to the RAN node 10A.
- the RAN node 10A is an example of a paging-active RAN node.
- RAN node 10B sends an NG SETUP request including a paging inactive indication with a dummy value set in the Supported Tracking Area list (TA list) (see non-patent document 2) to AMF 30A.
- AMF 30A sends an NG SETUP response to RAN node 10B.
- RAN node 10B is an example of a paging inactive RAN node, and the paging inactive indication can be set when the RAN is a next-generation system. Thereafter, the AMF does not use RAN node 10B for paging.
- step S103a the RAN node 10A sends a RAN configuration update (RAN CONFIGURATION UPDATE) to the AMF 30A.
- step S104a the AMF 30A sends a RAN configuration update acknowledgement (RAN CONFIGURATION UPDATE ACKNOWLEDGE) to the RAN node 10A.
- step S103b RAN node 10B sends a RAN configuration update including a paging inactivation indication to AMF 30A.
- step S104b AMF 30A sends a RAN configuration update acknowledgement to RAN node 10B. Thereafter, AMF does not use RAN node 10B for paging.
- FIG. 5 is a sequence diagram for explaining an example of cell selection in an embodiment of the present invention.
- RAN node 10B transmits notification information (see non-patent document 5) including an information element cellNotForPaging indicating that paging is inactive, which is true, to UE 20.
- notification information see non-patent document 5
- cellNotForPaging an information element indicating that paging is inactive, which is true.
- step S202 if UE 20 is not camped on another normal cell, it does not select the cell of RAN node 10B as a candidate for cell selection or cell reselection.
- the MN takes the initiative in allocating terminal wireless capabilities (e.g., frequency band combinations, function groups) between the MN and SN via interface Xn, and in allocating wireless resources when frequencies are shared between the MN and SN.
- terminal wireless capabilities e.g., frequency band combinations, function groups
- the MN takes the initiative in allocating wireless resources (e.g., frequency band combinations, function groups) between the MN and SN via interface Xn, and in allocating wireless resources when frequencies are shared between the MN and SN.
- terminal wireless capabilities e.g., frequency band combinations, function groups
- the RAN node notifies the AMF of the terminal radio capabilities, i.e., the remaining terminal radio capabilities and radio resources, i.e., the remaining terminal radio resources, that can be used by the buddy RAN node.
- the AMF holds the remaining terminal radio capabilities and the remaining terminal radio resources while CM-connected with the RAN.
- the AMF CM-connects with the buddy RAN node it notifies the buddy RAN node of the remaining terminal radio capabilities and the remaining terminal radio resources.
- the buddy RAN node may take into account all of the terminal radio capabilities, the remaining radio terminal capabilities and the remaining terminal radio resources, for example, when setting up a QoS flow.
- the RAN and AMF may operate as described below in accordance with existing specifications.
- the RAN If the RAN does not receive the capability from the AMF, it obtains the capability from the terminal and notifies the AMF of the capability. 2) The AMF retains the capability while the terminal is RM-registered. 3) The AMF notifies the RAN of the capability.
- FIG. 6 is a sequence diagram for explaining an example of a registration procedure in an embodiment of the present invention.
- UE 20 transmits a registration request message including a new dual MN indication IE (Information Element) to AMF 30A via NR and NG-RAN or via next-generation radio and next-generation RAN.
- the RAN node corresponding to the RAT and RAN used in step S301 is hereinafter referred to as RAN node 10A.
- UE 20 defines a new UE-CM state as UE-CM-connected.
- the UE-CM state is UE-CM-connected when at least one CM-connection exists, and UE-CM-idle when no CM-connection exists.
- AMF 30A stores in each MN-level terminal context the MN identifier corresponding to RAN node 10A, the Global RAN Node ID corresponding to RAN node 10A, the RAN UE NGAP ID corresponding to UE 20, and the AMF UE NGAP ID corresponding to UE 20.
- AMF 30A stores the MN identifier set as MN#1, the Global RAN Node ID of RAN node 10A previously acquired in the NG SETUP procedure, the RAN UE NGAP ID acquired from RAN node 10A, and the AMF UE NGAP ID that has already been assigned by AMF or will be assigned later.
- AMF 30 sets the newly defined UE-CM state to UE-CM-connected.
- each MN level terminal context may also include ULI (User Location Information) indicating user location information.
- ULI User Location Information
- AMF30A holds a set of RAN UE NGAP ID, AMF UE NGAP ID, and ULI in each access level terminal context (see non-patent document 5).
- the AMF 30A sends an Initial Context Setup request (see Non-Patent Document 2) to the RAN node 10A (see Non-Patent Document 5). This message does not include the terminal radio capabilities.
- the RAN node 10A transmits a UE Capability Enquiry message to the UE 20 (see non-patent document 9).
- the UE 20 transmits UE Capability Information to the RAN node 10A.
- the UE Capability Information may include all or part of the terminal radio capabilities.
- the RAN node 10A transmits a UE Radio Capability Info Indication (see non-patent document 2) to the AMF 30A.
- the UE Radio Capability Info Indication may include all of the terminal radio capabilities.
- the AMF 30A stores all or part of the terminal radio capabilities in the terminal context for the entire terminal corresponding to the UE 20.
- step S309 AMF 30A, UE 20, and RAN node 10A execute the normal registration procedure.
- step S310 AMF 30A sends a registration acceptance to UE 20.
- step S311a AMF 30A sets the RM state to RM registration.
- step S312a after completing the registration procedure, AMF 30A sets the CM state to CM-idle. That is, AMF 30A sets the UE-CM state to UE-CM-idle.
- step S311b UE 20, which has received the registration approval, sets the RM state to RM registration.
- step S312b UE 20 sets the CM state to CM-idle after completing the registration procedure. In other words, UE 20 sets the UE-CM state to UE-CM-idle.
- UE 20 when UE 20 sends the next registration request, it may use an available RAT and RAN as appropriate, regardless of the RAN node 10A used this time.
- FIG. 7 is a sequence diagram for explaining an example (1) of a PDU session establishment procedure in an embodiment of the present invention.
- the UE 20 transmits a PDU session establishment request to the AMF 30A via NR and NG-RAN or via next-generation radio and next-generation RAN (see Non-Patent Document 5).
- the PDU session establishment request includes a 5GSM (5GS Session Management) capability IE (see Non-Patent Document 6).
- Information indicating "QoS flow split by RAN" is newly set in the ATSSS-ST bit of the 5GSM capability IE.
- the UL NAS transport carrying the PDU session establishment request sets the request type to "MA PDU request” and the request sub-type to "3GPP access multiple connections" (see Non-Patent Document 5).
- the RAN node corresponding to the RAT and RAN used in step S401 is hereinafter referred to as the RAN node 10A.
- AMF 30A stores in each MN-level terminal context the MN identifier set as MN#1, the Global RAN Node ID of RAN node 10A previously acquired in the NG SETUP procedure, the RAN UE NGAP ID acquired from RAN node 10A, and the AMF UE NGAP ID that AMF 30A has already assigned or will assign later.
- AMF 30A selects SMF 30B (see non-patent document 5).
- AMF 30A sends an Nsmf_PDUSession_CreateSMContext Request (see non-patent document 5) including the PDU session establishment request to SMF 30B.
- the Nsmf_PDUSession_CreateSMContext Request includes the MN identifier set as MN #1.
- SMF30B assumes that MN#1 will set all QoS flows first, while taking into consideration the possibility that other MNs may be added, and transmits a Packet Forwarding Control Protocol (PFCP) session establishment request to UPF30C (see non-patent document 7).
- the PFCP session establishment request includes a Create MAR IE.
- the Create MAR IE includes a 3GPP Access MN#1 Forwarding IE.
- the Create MAR IE includes a 3GPP Access Forwarding Action Information IE and a Non-3GPP Access Forwarding Action Information IE (see non-patent document 7).
- UPF30C transmits a PFCP session establishment response to SMF30B.
- SMF30B transmits a Namf_Communication_N1N2MessageTransfer including a PDU Session Resource Setup Request Transfer IE to AMF30A (see non-patent document 5).
- the PDU Session Resource Setup Request Transfer IE includes a multiple MN tolerance indication and information indicating QoS flow division by RAN.
- the Namf_Communication_N1N2MessageTransfer message includes an MN identifier set as MN #1.
- SMF30B simultaneously transmits a PDU session establishment grant (see non-patent document 6) to UE20 within the Namf_Communication_N1N2MessageTransfer message.
- the PDU session establishment grant includes an indication of a PDU session branch setup request via another MN.
- step S409 AMF 30A compares the MN identifier, MN #1, received from SMF 30B with each MN-level terminal context held locally. As a result of the comparison, AMF 30A recognizes that MN #1 corresponds to RAN node 10A.
- step S410 AMF 30A transfers the PDU Session Resource Setup Request Transfer IE in the received Namf_Communication_N1N2MessageTransfer message via an N2PDU session request.
- the message sent to RAN 10A is a PDU session establishment request (see non-patent document 2), and includes the message received in step S409 and all or part of the terminal radio capabilities.
- the RAN node 10A detects from the measurement report obtained from the UE 20 that another RAN node #B is present near the UE 20.
- the RAN node 10A refers to all or part of the terminal radio capabilities, information from OAM (Operations administration and maintenance), etc., and determines the QoS flow distribution or QoS flow splitting that is assumed to be appropriate between its own device and the RAN node #B.
- QoS flow distribution means allocating each QoS flow to its own device or another RAN.
- QoS flow splitting means splitting one QoS flow and accommodating a part of it in its own device and the rest in another RAN.
- the RAN node 10A may follow the instructions of the UE 20 and/or the UPF 30C regarding the split ratio.
- the decision made by RAN node 10A in step S412 may be the same as in the case of DC, except for cases where the QoS flow division ratio follows instructions from UE 20 and/or UPF 30C.
- FIG. 8 is a sequence diagram for explaining an example (2) of a PDU session establishment procedure in an embodiment of the present invention.
- the RAN node 10A establishes with the UE 20 the QoS flow that the RAN node 10A has determined to accommodate in whole or in part (see Non-Patent Document 5).
- the RAN node 10A transfers a PDU session establishment grant to the UE 20.
- the RAN node 10A transmits a message including a PDU Session Resource Setup Response Transfer IE (see non-patent document 5) to the AMF 30A.
- the QoS flows that were not established are set in the QoS Flow Failed to Setup List IE included in the PDU Session Resource Setup Response Transfer IE, and the QoS flows to be split are set in the new IE QoS Flow Partly Setup List IE.
- the traffic ratio for the RAN node 10A may be set in the PDU Session Resource Setup Response Transfer IE.
- the message transmitted to the AMF 30A is a PDU session resource establishment response, and includes the remaining terminal radio capabilities, i.e. the terminal radio capabilities that can be used by the RAN node 10B, and the remaining terminal radio resources, i.e. the terminal radio resources that can be used by the RAN node B.
- step S415 AMF30A retains the remaining terminal radio capabilities and remaining terminal radio resources in each MN-level terminal context corresponding to the MN identifier MN#1.
- AMF 30A sends an Nsmf_PDUSession_UpdateSMContext Request (see non-patent document 5) including the received PDU Session Resource Setup Response Transfer IE to SMF 30B.
- the Nsmf_PDUSession_UpdateSMContext Request message includes the MN identifier, which is MN #1.
- SMF30B sends a PFCP session change request to UPF30C to set the ratio of the QoS flow for MN#1 and the TEID (Tunnel Endpoint Identifier) on the MN#1 side based on the QoS Flow Partly Setup List IE indicating the QoS flow for MN#1 and, for the split QoS flows, the QoS flow for MN#1.
- the PFCP session change request sets the ratio of the QoS flow for MN#1 in the Update 3GPP Access MN#1 Forwarding Action Information IE included in the PFCP session change request.
- UPF30C sends a PFCP session change response to SMF30B.
- step S419 the UE 20 transmits a PDU session change request to the RAN node 10B.
- the UE 20 sets the same PDU session ID as the PDU session establishment request of step S401 in the PDU session change request.
- the RAN node 10B checks the 5G-S-TMSI (Temporary Mobile Subscriber Identity) in the RRC message including the received PDU session change request, and forwards the PDU session change request to the same AMF 30A (see non-patent document 5).
- 5G-S-TMSI Temporary Mobile Subscriber Identity
- AMF 30A stores in each MN-level terminal context the MN identifier set as MN#2, the Global RAN Node ID of RAN node 10B previously acquired in the NG SETUP procedure, the RAN UE NGAP ID acquired from RAN node 10B, and the AMF UE NGAP ID that AMF 30A has already assigned or will assign later.
- the AMF 30A sends a UE context change request to the RAN node 10A.
- the UE context change request message includes a newly defined buddy RAN node IE.
- the buddy RAN node IE may be the Global RAN Node ID or the RAT type of the RAN node 10B.
- AMF 30A selects the same SMF 30B because the PDU session ID of the received PDU session change request is the same as that of the already established PDU session.
- AMF 30A sends an Nsmf_PDUSession_UpdateSMContext Request including the received PDU session change request to SMF 30B (see non-patent document 5).
- the Nsmf_PDUSession_UpdateSMContext Request message includes the MN identifier set to MN #2.
- step S425 when SMF30B receives the Nsmf_PDUSession_UpdateSMContext Request message, it checks the QoS Flow Failed to Setup List IE and QoS Flow Partly Setup List IE received in step S416, and determines the QoS flows that need to be set up in MN#2.
- step S426 SMF30B selects the same UPF30C because the PDU session ID of the PDU session change request included in the Nsmf_PDUSession_UpdateSMContext Request message is the same as the already established PDU session.
- step S427 SMF30B sends a PFCP session change request to UPF30C to set up the QoS flow that needs to be set up in MN#2.
- the 3GPP Access MN#2 Forwarding Action Information IE in the Update MAR IE (see non-patent document 7) included in the PFCP session change request is set to the traffic ratio for MN#2 derived from the traffic ratio for MN#1 described in the QoS Flow Partly Setup List IE.
- step S428 UPF30C sends a PFCP session change response to SMF30B.
- SMF30B recognizes that the MNs are different and sends a Namf_Communication_N1N2MessageTransfer including a PDU Session Resource Setup Request Transfer IE (see non-patent document 2) to AMF30A for the QoS flow that needs to be set up in MN#2.
- the PDU Session Resource Setup Request Transfer IE includes a multiple MN not allowed indication.
- the Namf_Communication_N1N2MessageTransfer message includes the MN identifier, which is MN#2.
- SMF30B simultaneously sends a PDU session change command to UE20 within the Namf_Communication_N1N2MessageTransfer message.
- the PDU session change command includes an ATSSS container IE.
- SMF30B sets the QoS flow distribution division information between MN#1 and MN#2 in the ATSSS container IE (see non-patent document 8).
- FIG. 9 is a sequence diagram for explaining an example (3) of a PDU session establishment procedure in an embodiment of the present invention.
- AMF 30A compares the MN identifier received from SMF 30B as MN #2 with each MN-level terminal context held locally. As a result of the comparison, AMF 30A recognizes that MN #2 corresponds to RAN node 10B.
- the AMF 30A transfers a PDU session resource establishment request including the received PDU Session Resource Setup Request Transfer IE and a PDU session change command message to the RAN node 10B.
- the PDU session resource establishment request includes a newly defined buddy RAN node.
- the buddy RAN node IE may be the Global RAN Node ID or the RAT type of the RAN node 10A.
- the PDU session resource establishment request includes all or part of the terminal radio capabilities, the remaining terminal radio capabilities and the remaining terminal radio resources in each MN level terminal context corresponding to the MN identifier as MN#1.
- the RAN node 10B establishes a QoS flow with the UE 20, taking into account all or part of the terminal radio capabilities received in step S431, the remaining terminal radio capabilities, and the remaining terminal radio resources. At the same time, the RAN node 10B transfers a PDU session modification command to the UE 20 (see Non-Patent Document 5).
- the ATSSS container IE is used to set intra-terminal rules related to QoS (see Non-Patent Document 5).
- RAN node 10B transmits a message including a PDU Session Resource Setup Response Transfer IE (see non-patent document 5) to AMF 30A.
- the message transmitted to AMF 30A is a PDU session resource establishment response, and includes the remaining terminal radio capabilities, i.e., the terminal radio capabilities that can be used by RAN node 10A, and the remaining terminal radio resources, i.e., the terminal radio resources that can be used by RAN node A.
- the AMF 30A retains the remaining terminal radio capabilities and the remaining terminal radio resources in each MN-level terminal context corresponding to the MN identifier set as MN#2.
- the AMF 30A transmits a UE context modification request (see Non-Patent Document 2) to the RAN node 10A.
- the UE context modification request includes the remaining terminal radio capabilities and the remaining terminal radio resources in each MN-level terminal context corresponding to the MN identifier set as MN#2.
- AMF 30A sends an Nsmf_PDUSession_UpdateSMContext Request (see non-patent document 5) including the received PDU Session Resource Setup Response Transfer IE to SMF 30B.
- the Nsmf_PDUSession_UpdateSMContext Request message includes the MN identifier set as MN #2.
- step S438 SMF30B sends a PFCP session change request to UPF30C to set the TEID on the MN#2 side.
- step S439 UPF30C sends a PFCP session change response to SMF30B.
- the RAN node 10A may determine the handover destination taking into consideration the measurement report, RRM information, buddy RAN node, the remaining terminal radio capabilities and remaining terminal radio resources of the buddy RAN node, and RAN deployment information acquired from the OAM (see non-patent document 10). For example, taking into consideration the RAN type or RAT of the buddy RAN node, a configuration in which one of two MNs belongs to the NG-RAN and the other belongs to the next-generation RAN at the time of handover is possible. Note that the mechanism for ensuring this configuration at the time of cell selection may be terminal implementation dependent.
- the above-described embodiment allows for the configuration of dual MNs each using a different RAT, and allows communication between the dual MNs to be performed while taking into account each other's remaining wireless resources.
- wireless resource allocation can be performed.
- the base station 10, the network node 30, and the terminal 20 each include functions for performing the above-described embodiments. However, the base station 10, the network node 30, and the terminal 20 may each include only a part of the functions of the embodiments.
- FIG. 10 is a diagram showing an example of the functional configuration of the base station 10 and the network node 30.
- the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140.
- the functional configuration shown in FIG. 10 is merely an example. As long as the operation according to the embodiment of the present invention can be performed, the names of the functional divisions and the functional units may be any.
- the network node 30 may have the same functional configuration as the base station 10.
- a network node 30 having a plurality of different functions in the system architecture may be composed of a plurality of network nodes 30 separated by function.
- the transmitting 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 another network node 30, and acquiring, for example, information of a higher layer from the received signal.
- a communication unit including the transmitting unit 110 and the receiving unit 120 may be configured.
- the setting unit 130 stores in a storage device the setting information that is set in advance and various setting information to be transmitted to the terminal 20, and reads it from the storage device as necessary.
- the contents of the setting information include, for example, information related to the dual MN configuration.
- the control unit 140 performs processes related to communication in the network as described in the embodiment.
- the control unit 140 also performs processes for communication in a dual MN configuration.
- the control unit 140 also performs processes related to communication with the terminal 20.
- the functional unit in the control unit 140 related to signal transmission may be included in the transmitting unit 110, and the functional unit in the control unit 140 related to signal reception may be included in the receiving unit 120.
- Fig. 11 is a diagram showing an example of the functional configuration of the terminal 20.
- the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240.
- the functional configuration shown in Fig. 11 is merely an example. As long as the operation related to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any.
- the communication device that becomes the resource holder 20 may have the same functional configuration as the terminal 20.
- the transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly.
- the receiving unit 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals.
- 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.
- a communication unit including the transmitting unit 210 and the receiving unit 220 may be configured.
- the setting unit 230 stores various setting information received from the network node 30 by the receiving unit 220 in a storage device, and reads it from the storage device as necessary.
- the setting unit 230 also stores setting information that is set in advance.
- the contents of the setting information include, for example, information related to the dual MN configuration.
- the control unit 240 performs processing related to communication in the network as described in the embodiment.
- the functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.
- each functional block may be realized using one device that is physically or logically coupled, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (for example, using wires, wirelessly, etc.).
- the functional block may be realized by combining the one device or the multiple devices with software.
- Functions include, but are not limited to, judgement, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment.
- a functional block (component) that performs the transmission function is called a transmitting unit or transmitter.
- the network node 30, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 12 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 in one embodiment of the present disclosure.
- the network node 30 may have the same hardware configuration as the base station 10.
- the above-mentioned base station 10 and terminal 20 may be physically configured as a computer device including a processor 1001, a memory device 1002, an auxiliary memory device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.
- the term "apparatus" can be interpreted as a circuit, device, unit, etc.
- the hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.
- the functions of the base station 10 and the terminal 20 are realized by loading specific software (programs) onto hardware such as the processor 1001 and the storage device 1002, causing the processor 1001 to perform calculations, control communications by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.
- the processor 1001 for example, operates an operating system to control the entire computer.
- the processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, etc.
- CPU central processing unit
- control unit 140, control unit 240, etc. may be realized by the processor 1001.
- the processor 1001 reads out a program (program code), software module, 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 the program.
- the program is a program that causes a computer to execute at least a part of the operations described in the above-mentioned embodiment.
- the control unit 140 of the base station 10 shown in FIG. 10 may be stored in the storage device 1002 and realized by a control program that runs on the processor 1001.
- the control unit 240 of the terminal 20 shown in FIG. 11 may be stored in the storage device 1002 and realized by a control program that runs on the processor 1001.
- the processor 1001 may be implemented by one or more chips.
- the program may be transmitted from a network via a telecommunication line.
- the storage device 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc.
- the storage device 1002 may also be called a register, a cache, a main memory, etc.
- the storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method relating to one embodiment of the present disclosure.
- the auxiliary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc.
- the above-mentioned storage medium may be, for example, a database, a server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary 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 referred to as, for example, a network device, a network controller, a network card, a communication module, etc.
- the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD).
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the transmitting/receiving antenna, an amplifier unit, a transmitting/receiving unit, a transmission path interface, etc. may be realized by the communication device 1004.
- the transmitting/receiving unit may be implemented as a transmitting unit or a receiving unit that is physically or logically separated.
- the input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside.
- the output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one structure (e.g., 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 each device.
- the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware.
- the processor 1001 may be implemented using at least one of these pieces of hardware.
- FIG. 13 shows an example configuration of a vehicle 2001.
- the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013.
- a communication device mounted on the vehicle 2001 and may be applied to the communication module 2013, for example.
- the drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.
- the steering unit 2003 includes at least a steering wheel (also called a handlebar), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.
- the electronic control unit 2010 is composed of a microprocessor 2031, memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001.
- the electronic control unit 2010 may also be called an ECU (Electronic Control Unit).
- Signals from the various sensors 2021-2029 include a current signal from a current sensor 2021 that senses the motor current, a front and rear wheel rotation speed signal obtained by a rotation speed sensor 2022, a front and rear wheel air pressure signal obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.
- the information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices.
- the information service unit 2012 uses information acquired from an external device via the communication module 2013 or the like to provide various multimedia information and multimedia services to the occupants of the vehicle 2001.
- the information service unit 2012 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that perform output to the outside.
- input devices e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.
- output devices e.g., a display, a speaker, an LED lamp, a touch panel, etc.
- the driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as a millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high definition (HD) maps, autonomous vehicle (AV) maps, etc.), a gyro system (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chip, and AI processor, as well as one or more ECUs that control these devices.
- the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize driving assistance functions or autonomous driving functions.
- the communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port.
- the communication module 2013 transmits and receives data via the communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided on the vehicle 2001.
- the communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication.
- the communication module 2013 may be located either inside or outside the electronic control unit 2010.
- the external device may be, for example, a base station, a mobile station, etc.
- the communication module 2013 may transmit at least one of the signals from the various sensors 2021-2028 described above input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication.
- the electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may be referred to as input units that accept input.
- the PUSCH transmitted by the communication module 2013 may include information based on the above input.
- the communication module 2013 receives various information (traffic information, signal information, vehicle distance information, etc.) transmitted from an external device and displays it on the information service unit 2012 provided in the vehicle 2001.
- the information service unit 2012 may be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 2013).
- the communication module 2013 also stores various information received from an external device in a memory 2032 that can be used by the microprocessor 2031.
- the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.
- a network node which includes a communication unit that receives a registration request including information indicating the use of two master nodes from a terminal via a RAN (Radio Access Network) node, and a control unit that holds a total of two terminal contexts for each master node, wherein the control unit holds a master node identifier corresponding to the RAN node, remaining terminal radio capabilities and remaining terminal radio resources in the terminal context for each master node, the control unit derives two CM (Connection management) states of the terminal based on the terminal context for each master node, and the communication unit notifies the other of the two master nodes of the remaining terminal radio capabilities and remaining terminal radio resources included in the terminal context for each master node corresponding to one of the two master nodes.
- CM Connection management
- the above configuration allows for the configuration of dual MNs that each use a different RAT, and allows communication by the dual MNs to be performed while taking into account each other's remaining wireless resources.
- wireless resources can be allocated in a wireless communication system in which two base stations both operate as master nodes.
- the communication unit may receive, from one of the two master nodes, remaining terminal radio capabilities and remaining terminal radio resources that can be used by the other of the two master nodes.
- dual MNs that each use a different RAT can be configured, and communication by the dual MNs can be performed taking into account each other's remaining radio resources.
- the communication unit may receive all or part of the terminal wireless capabilities from one of the two master nodes.
- a dual MN can be configured in which each node uses a different RAT, and communication by the dual MN can be performed taking into account each node's remaining wireless resources.
- the control unit may retain all or part of the terminal radio capabilities in a terminal context for the entire terminal.
- dual MNs each using a different RAT can be configured, and communication by the dual MNs can be performed taking into account each other's remaining radio resources.
- a communication method in which a network node executes the following steps: receiving a registration request including information indicating the use of two master nodes from a terminal via a RAN (Radio Access Network) node; retaining a total of two terminal contexts for each master node; retaining, in the terminal context for each master node, a master node identifier corresponding to the RAN node, a global RAN node identifier corresponding to the RAN node, an identifier for identifying the terminal on an NG (Next Generation) interface within the RAN node, an identifier for identifying the terminal on an NG interface within an AMF (Access and Mobility Management Function), residual terminal radio capabilities, and residual terminal radio resources; and deriving two CM (Connection management) states of the terminal based on the terminal context for each master node, and notifying the other of the two master nodes of the residual terminal radio capabilities and residual terminal radio resources included in the terminal context for each master node corresponding to one of
- the above configuration allows for the configuration of dual MNs that each use a different RAT, and allows communication by the dual MNs to be performed while taking into account each other's remaining wireless resources.
- wireless resources can be allocated in a wireless communication system in which two base stations both operate as master nodes.
- the operations of multiple functional units may be physically performed by one part, or the operations of one functional unit may be physically performed by multiple parts.
- the order of the processing procedures described in the embodiment may be changed as long as there is no contradiction.
- the base station 10 and the terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof.
- the software operated by the processor possessed by the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor possessed by the terminal 20 in accordance with an embodiment of the present invention may each be 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 suitable storage medium.
- the notification of information is not limited to the aspects/embodiments described in the present disclosure and may be performed using other methods.
- the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination of these.
- RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.
- Each aspect/embodiment described in this disclosure may be a mobile communication system (mobile communications system) for mobile communications over a wide range of networks, including LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal number)), FRA (Future Ra).
- the present invention may be applied to at least one of systems using IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems, and next-generation systems that are expanded, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (for example, a combination of at least one
- certain operations that are described as being performed by the base station 10 may in some cases be performed by its upper node.
- various operations performed for communication with a terminal 20 may be performed by at least one of the base station 10 and other network nodes other than the base station 10 (such as, but not limited to, an MME or S-GW).
- the base station 10 may be a combination of multiple other network nodes (such as an MME and an S-GW).
- the information or signals described in this disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). They may be input and output via multiple network nodes.
- the input and output information may be stored in a specific location (e.g., memory) or may be managed using a management table.
- the input and output information may be overwritten, updated, or added to.
- the output information may be deleted.
- the input information may be sent to another device.
- the determination in this disclosure may be based on a value represented by one bit (0 or 1), a Boolean (true or false) value, or a comparison of numerical values (e.g., a comparison with a predetermined value).
- Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
- Software, instructions, information, etc. may also be transmitted and received via a transmission medium.
- a transmission medium For example, if the software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.
- wired technologies such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)
- wireless technologies such as infrared, microwave
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies.
- the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.
- the channel and the symbol may be a signal (signaling).
- the signal may be a message.
- the component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.
- system and “network” are used interchangeably.
- a radio resource may be indicated by an index.
- the names used for the above-mentioned parameters are not limiting in any respect. Furthermore, the formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure.
- the various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any respect.
- base station BS
- wireless base station base station
- base station device fixed station
- NodeB nodeB
- eNodeB eNodeB
- gNodeB gNodeB
- access point e.g., "transmission point”
- gNodeB gNodeB
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.
- a base station can accommodate one or more (e.g., three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)).
- RRH Remote Radio Head
- the term "cell” or “sector” refers to a part or the entire coverage area of at least one of the base station and base station subsystems that provide communication services in this coverage.
- a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.
- MS Mobile Station
- UE User Equipment
- a mobile station may also be referred to 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 terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc.
- At least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.
- the moving object is a movable object, and the moving speed is arbitrary. It also includes the case where the moving object is stopped.
- the moving object includes, but is not limited to, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a connected car, an excavator, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a handcar, a rickshaw, a ship and other watercraft, an airplane, a rocket, an artificial satellite, a drone (registered trademark), a multicopter, a quadcopter, a balloon, and objects mounted thereon.
- the moving object may also be a moving object that travels autonomously based on an operation command.
- At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations.
- at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a user terminal.
- each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)).
- the terminal 20 may be configured to have the functions of the base station 10 described above.
- terms such as "uplink” and "downlink” may be read as terms corresponding to terminal-to-terminal communication (for example, "side").
- the uplink channel, downlink channel, etc. may be read as a side channel.
- the user terminal in this disclosure may be interpreted as a base station.
- the base station may be configured to have the functions of the user terminal described above.
- determining may encompass a wide variety of actions.
- Determining and “determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., searching in a table, database, or other data structure), and considering ascertaining as “judging” or “determining.”
- determining and “determining” may include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and considering ascertaining as “judging” or “determining.”
- judgment” and “decision” can include considering resolving, selecting, choosing, establishing, comparing, etc., to have been “judged” or “decided.” In other words, “judgment” and “decision” can include considering some action to have been “judged” or “decided.” Additionally, “judgment (decision)” can be interpreted as “assuming,” “ex
- connection refers to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between elements may be physical, logical, or a combination thereof.
- “connected” may be read as "access.”
- two elements may be considered to be “connected” or “coupled” to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.
- the reference signal may also be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.
- the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to an element using a designation such as "first,” “second,” etc., 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, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean “A and B are each different from C.”
- Terms such as “separate” and “combined” may also be interpreted in the same way as “different.”
- notification of specific information is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).
- Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 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
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Abstract
Description
2)AMFは、端末がRM-登録の間、当該能力を保持する。
3)AMFは、RANに当該能力を通知する。
次に、これまでに説明した処理及び動作を実施する基地局10、ネットワークノード30及び端末20の機能構成例を説明する。基地局10、ネットワークノード30及び端末20は上述した実施例を実施する機能を含む。ただし、基地局10、ネットワークノード30及び端末20はそれぞれ、実施例の中の一部の機能のみを備えることとしてもよい。
図10は、基地局10及びネットワークノード30の機能構成の一例を示す図である。図10に示されるように、基地局10は、送信部110と、受信部120と、設定部130と、制御部140とを有する。図10に示される機能構成は一例に過ぎない。本発明の実施の形態に係る動作を実施できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。なお、ネットワークノード30は、基地局10と同様の機能構成を有してもよい。また、システムアーキテクチャ上で複数の異なる機能を有するネットワークノード30は、機能ごとに分離された複数のネットワークノード30から構成されてもよい。
図11は、端末20の機能構成の一例を示す図である。図11に示されるように、端末20は、送信部210と、受信部220と、設定部230と、制御部240とを有する。図11に示される機能構成は一例に過ぎない。本発明の実施の形態に係る動作を実施できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。また、リソース保持者20となる通信装置は、端末20と同様の機能構成を有してもよい。
上記実施形態の説明に用いたブロック図(図10及び図11)は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
以上、説明したように、本発明の実施の形態によれば、二つのマスタノードを使用することを示す情報を含む登録要求をRAN(Radio Access Network)ノードを介して端末から受信する通信部と、マスタノードごとの端末コンテキストを計二つ保持する制御部とを有し、前記制御部は、前記マスタノードごとの端末コンテキストに、前記RANノードに対応するマスタノード識別子、残余端末無線能力及び残余端末無線資源を保持し、前記制御部は、前記マスタノードごとの端末コンテキストに基づいて、前記端末の二つのCM(Connection management)状態を導出し、前記通信部は、前記二つのマスタノードの一方に対応する前記マスタノードごとの端末コンテキストに含まれる残余端末無線能力及び残余端末無線資源を、前記二つのマスタノードの他方に通知するネットワークノードが提供される。
以上、本発明の実施の形態を説明してきたが、開示される発明はそのような実施形態に限定されず、当業者は様々な変形例、修正例、代替例、置換例等を理解するであろう。発明の理解を促すため具体的な数値例を用いて説明がなされたが、特に断りのない限り、それらの数値は単なる一例に過ぎず適切な如何なる値が使用されてもよい。上記の説明における項目の区分けは本発明に本質的ではなく、2以上の項目に記載された事項が必要に応じて組み合わせて使用されてよいし、ある項目に記載された事項が、別の項目に記載された事項に(矛盾しない限り)適用されてよい。機能ブロック図における機能部又は処理部の境界は必ずしも物理的な部品の境界に対応するとは限らない。複数の機能部の動作が物理的には1つの部品で行われてもよいし、あるいは1つの機能部の動作が物理的には複数の部品により行われてもよい。実施の形態で述べた処理手順については、矛盾の無い限り処理の順序を入れ替えてもよい。処理説明の便宜上、基地局10及び端末20は機能的なブロック図を用いて説明されたが、そのような装置はハードウェアで、ソフトウェアで又はそれらの組み合わせで実現されてもよい。本発明の実施の形態に従って基地局10が有するプロセッサにより動作するソフトウェア及び本発明の実施の形態に従って端末20が有するプロセッサにより動作するソフトウェアはそれぞれ、ランダムアクセスメモリ(RAM)、フラッシュメモリ、読み取り専用メモリ(ROM)、EPROM、EEPROM、レジスタ、ハードディスク(HDD)、リムーバブルディスク、CD-ROM、データベース、サーバその他の適切な如何なる記憶媒体に保存されてもよい。
110 送信部
120 受信部
130 設定部
140 制御部
20 端末
210 送信部
220 受信部
230 設定部
240 制御部
30 ネットワークノード
1001 プロセッサ
1002 記憶装置
1003 補助記憶装置
1004 通信装置
1005 入力装置
1006 出力装置
Claims (5)
- 二つのマスタノードを使用することを示す情報を含む登録要求をRAN(Radio Access Network)ノードを介して端末から受信する通信部と、
マスタノードごとの端末コンテキストを計二つ保持する制御部とを有し、
前記制御部は、前記マスタノードごとの端末コンテキストに、前記RANノードに対応するマスタノード識別子、残余端末無線能力及び残余端末無線資源を保持し、
前記制御部は、前記マスタノードごとの端末コンテキストに基づいて、前記端末の二つのCM(Connection management)状態を導出し、
前記通信部は、前記二つのマスタノードの一方に対応する前記マスタノードごとの端末コンテキストに含まれる残余端末無線能力及び残余端末無線資源を、前記二つのマスタノードの他方に通知するネットワークノード。 - 前記通信部は、前記二つのマスタノードの一方から、前記二つのマスタノードの他方が使用可能な残余端末無線能力及び残余端末無線資源を受信する請求項1記載のネットワークノード。
- 前記通信部は、前記二つのマスタノードの一方から、端末無線能力のすべて又は一部を受信する請求項1記載のネットワークノード。
- 前記制御部は、前記端末無線能力のすべて又は一部を、端末全体としての端末コンテキストに保持する請求項3記載のネットワークノード。
- 二つのマスタノードを使用することを示す情報を含む登録要求をRAN(Radio Access Network)ノードを介して端末から受信する手順と、
マスタノードごとの端末コンテキストを計二つ保持する手順と、
前記マスタノードごとの端末コンテキストに、前記RANノードに対応するマスタノード識別子、残余端末無線能力及び残余端末無線資源を保持する手順と、
前記マスタノードごとの端末コンテキストに基づいて、前記端末の二つのCM(Connection management)状態を導出する手順と、
前記二つのマスタノードの一方に対応する前記マスタノードごとの端末コンテキストに含まれる残余端末無線能力及び残余端末無線資源を、前記二つのマスタノードの他方に通知する手順とをネットワークノードが実行する通信方法。
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