Apparatus, method and computer program

Abstract

The present disclosure relates to an apparatus comprising at least one processor and at least one memory, the at least one memory comprising computer code for one or more programs, the at least one memory and the computer code being configured to, with the at least one processor, generate one or more programs. Causing the apparatus to perform at least: sending (500) a registration request message to the core network function via the base station, the registration request message indicating that the apparatus supports a plurality of simultaneous registers with a single network or a plurality of networks using the same access type; and negotiating (502), via the base station, a reduced device capability with the core network function, the reduced device capability to be used by the base station to configure the device to communicate with the base station when the device has multiple simultaneous registrations with a single network or multiple networks using the same access type.

Description

Technical Field

[0001] This disclosure relates to apparatus, methods, and computer programs for managing multiple simultaneous registrations to a single or multiple networks using the same access type in a communication system. Background Technology

[0002] A communication system can be viewed as a facility that enables a communication session between two or more entities (such as communication equipment, base stations, and / or other nodes) by providing carriers between various entities involved in the communication path.

[0003] A communication system can be a wireless communication system. Examples of wireless systems include Public Land Mobile Networks (PLMNs) that operate based on wireless standards (such as those provided by 3GPP), satellite-based communication systems, and various wireless local networks, such as Wireless Local Networks (WLANs). Wireless systems are typically divided into cells and are therefore often referred to as cellular systems.

[0004] Communication systems and associated equipment typically operate according to a given standard or specification that defines what the various entities associated with the system are allowed to do and how they should be implemented. The communication protocols and / or parameters used for the connection are also usually defined. An example of such a standard is the so-called 5G standard. Summary of the Invention

[0005] According to one aspect, an apparatus is provided, comprising: at least one processor and at least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: send a registration request message to a core network function via a base station, the registration request message indicating that the apparatus supports multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiate a reduced apparatus capability with the core network function via the base station, the reduced apparatus capability being used by the base station to: configure the apparatus to communicate with the base station when the apparatus has multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0006] Registration to a single network or multiple simultaneous registrations to multiple networks can utilize 3GPP access (i.e., cellular access).

[0007] The registration request message can explicitly or implicitly indicate that the device supports simultaneous registration to a single network or multiple networks using the same access type.

[0008] The registration request message may include a field: "Simultaneous registration with a single network or multiple networks using the same access type", which explicitly indicates that the device supports simultaneous registration with a single network or multiple networks using the same access type; or the registration request message may include a registration identifier field, which implicitly indicates that the device supports simultaneous registration with a single network or multiple networks using the same access type.

[0009] The reduction of device capabilities negotiated between the base station and the core network function may include: receiving a registration acceptance message from the core network function via the base station, the registration acceptance message indicating the reduction of device capabilities, wherein the reduction of device capabilities is determined by the core network function; and sending a registration completion message to the core network function via the base station, the registration completion message indicating: confirmation of the reduction of device capabilities determined by the core network function.

[0010] The reduction of device capabilities negotiated between the base station and the core network function may include: sending a registration request message to the core network function via the base station, the registration request message indicating the reduction of device capabilities, wherein the reduction of device capabilities is determined by the device; and receiving a registration acceptance message from the core network function via the base station, the registration acceptance message indicating: confirmation of the reduction of device capabilities determined by the device or alternative reduction of device capabilities, wherein the alternative reduction of device capabilities is determined by the core network function.

[0011] At least one memory may store instructions that, when executed by at least one processor, also cause the device to at least: receive a registration acceptance message from a core network function via a base station, the registration acceptance message indicating a first identifier and at least one second identifier, the first identifier identifying full device capability and the at least one second identifier identifying at least one reduced device capability.

[0012] At least one memory may store instructions that, when executed by at least one processor, also cause the device to at least: send a message including a first identifier to a base station based on registration with a single network, the first identifier identifying the complete device capabilities, the message including the first identifier being configured to: cause the base station to configure the device to communicate with the base station based on the complete device capabilities.

[0013] At least one memory may store instructions that, when executed by at least one processor, also cause the device to at least: perform multiple simultaneous registrations to a single network or multiple networks using the same access type; send a message to a base station including at least one second identifier, the at least one second identifier identifying at least one reduced device capability; the message including at least one second identifier is configured to: cause the base station to configure the device to communicate with the base station based on the reduced device capability.

[0014] At least one memory may store instructions that, when executed by at least one processor, also cause the device to at least: send a message to a base station containing information based on performing multiple simultaneous registrations to a single network or multiple networks using the same access type, the information indicating reduced device capabilities due to the multiple registrations to a single network or multiple networks using the same access type, the message containing information being configured to: cause the base station to obtain the reduced device capabilities from core network functions, and configure the device to communicate with the base station based on the reduced device capabilities.

[0015] A first identifier identifying complete device capability, at least one second identifier identifying at least one degraded device capability, or information indicating degraded device capability due to multiple registrations to a single network or multiple networks using the same access type can be sent in a radio resource control message.

[0016] The reduced device capability can be a percentage of the full device capability.

[0017] The complete device capability may include at least one of the following: the number of component carriers; or the number of cell groups.

[0018] Simultaneous registration with a single network or multiple networks using the same access type can include: establishing a wireless connection with a single cellular network or multiple networks of the same access type at the same time.

[0019] According to one aspect, an apparatus is provided, the apparatus including components for: sending a registration request message to a core network function via a base station, the registration request message indicating that the apparatus supports multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiating a reduced apparatus capability with the core network function via the base station, the reduced apparatus capability being used by the base station to: configure the apparatus to communicate with the base station when the apparatus has multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0020] According to one aspect, an apparatus is provided, the apparatus including a circuit system configured to perform: sending a registration request message to a core network function via a base station, the registration request message indicating that the apparatus supports multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiating a reduced apparatus capability with the core network function via the base station, the reduced apparatus capability being used by the base station to: configure the apparatus to communicate with the base station when the apparatus has multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0021] According to one aspect, a method is provided, the method comprising: sending a registration request message to a core network function via a base station, the registration request message indicating that a device supports multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiating with the core network function via the base station a reduced device capability, the reduced device capability being used by the base station to: configure the device to communicate with the base station when the device has multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0022] Registration to a single network or multiple simultaneous registrations to multiple networks can utilize 3GPP access (i.e., cellular access).

[0023] The registration request message can explicitly or implicitly indicate that the device supports simultaneous registration to a single network or multiple networks using the same access type.

[0024] The registration request message may include a field: "Multiple simultaneous registrations to a single network or multiple networks using the same access type", which explicitly indicates that the device supports multiple simultaneous registrations to a single network or multiple networks using the same access type; or the registration request message may include a registration identifier field, which implicitly indicates that the device supports multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0025] The reduction of device capabilities negotiated between the base station and the core network function may include: receiving a registration acceptance message from the core network function via the base station, the registration acceptance message indicating the reduction of device capabilities, wherein the reduction of device capabilities is determined by the core network function; and sending a registration completion message to the core network function via the base station, the registration completion message indicating: confirmation of the reduction of device capabilities determined by the core network function.

[0026] The reduction of device capabilities negotiated between the base station and the core network function may include: sending a registration request message to the core network function via the base station, the registration request message indicating the reduction of device capabilities, wherein the reduction of device capabilities is determined by the device; and receiving a registration acceptance message from the core network function via the base station, the registration acceptance message indicating: confirmation of the reduction of device capabilities determined by the device or alternative reduction of device capabilities, wherein the alternative reduction of device capabilities is determined by the core network function.

[0027] The method may include: receiving a registration acceptance message from a core network function via a base station, the registration acceptance message indicating a first identifier and at least one second identifier, the first identifier identifying full device capability and the at least one second identifier identifying at least one reduced device capability.

[0028] The method may include: sending a message including a first identifier to a base station based on performing registration with a single network, the first identifier identifying complete device capabilities, wherein the message including the first identifier is configured to: cause the base station configuration device to communicate with the base station based on the complete device capabilities.

[0029] The method may include: performing multiple simultaneous registrations to a single network or multiple networks using the same access type, sending a message to a base station including at least one second identifier, the at least one second identifier identifying at least one reduced device capability, wherein the message including at least one second identifier is configured to: cause a base station configuration device to communicate with the base station based on the reduced device capability.

[0030] The method may include: sending a message including information to a base station based on performing multiple simultaneous registrations to a single network or multiple networks using the same access type, the information indicating reduced device capabilities due to multiple registrations to a single network or multiple networks using the same access type, the message including information being configured to: cause the base station to obtain the reduced device capabilities from core network functions, and configure the device to communicate with the base station based on the reduced device capabilities.

[0031] A first identifier identifying complete device capability, at least one second identifier identifying at least one degraded device capability, or information indicating degraded device capability due to multiple registrations to a single network or multiple networks using the same access type can be sent in a radio resource control message.

[0032] The reduced device capability can be a percentage of the full device capability.

[0033] The complete device capability may include at least one of the following: the number of component carriers; or the number of cell groups.

[0034] Simultaneous registration with a single network or multiple networks using the same access type can include: establishing a wireless connection with a single cellular network or multiple networks of the same access type at the same time.

[0035] According to one aspect, a computer program is provided, comprising computer-executable code, which, when executed on at least one processor, is configured to: send a registration request message to a core network function via a base station, the registration request message indicating that the device supports multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiate with the core network function via the base station a reduced device capability, the reduced device capability to be used by the base station for: configuring the device to communicate with the base station when the device has multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0036] According to one aspect, an apparatus is provided, the apparatus comprising at least one processor and at least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: receive a registration request message from a user equipment via a base station, the registration request message instructing the user equipment to support multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiate with the user equipment a reduced user equipment capability, the reduced user equipment capability being used by the base station to: configure the user equipment to communicate with the base station when the user equipment has multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0037] Negotiating a reduction in user equipment capabilities with the user equipment may include: sending a registration acceptance message containing information to the user equipment via a base station, the information indicating a reduction in user equipment capabilities, wherein the reduction in device capabilities is determined by the device; and receiving a registration completion message from the user equipment, the registration completion message indicating confirmation of the reduction in user equipment capabilities determined by the device.

[0038] Negotiating a reduction in user equipment capabilities with the user equipment may include: receiving a registration request message from the user equipment via a base station, the registration request message indicating a reduction in user equipment capabilities, wherein the reduction in device capabilities is determined by the user equipment; and sending a registration acceptance message to the user equipment via the base station, the registration acceptance message indicating: confirmation of the reduction in user equipment capabilities determined by the user equipment or an alternative reduction in user equipment capabilities, wherein the alternative reduction in user equipment capabilities is determined by the device.

[0039] At least one memory may store instructions that, when executed by at least one processor, cause the apparatus to at least: send a request to another core network function to determine full user equipment capabilities and at least one reduced user equipment capability; and receive from the other core network function a first identifier identifying the full user equipment capability determined by the other core network function, the full user equipment capability determined by the other core network function, at least one second identifier identifying the at least one reduced user equipment capability determined by the other core network function, and the at least one reduced user equipment capability determined by the other core network function.

[0040] Another core network function may store a first identifier of the complete user equipment capability determined by the other core network function, the complete user equipment capability determined by the other core network function, at least one second identifier of at least one reduced user equipment capability determined by the other core network function, and at least one reduced user equipment capability determined by the other core network function.

[0041] At least one memory storage instruction, when executed by at least one processor, causes the device to at least: transmit a first identifier and at least one second identifier to the user equipment and to the base station via the base station, the first identifier identifying full user equipment capability determined by another core network function, and the at least one second identifier identifying at least one reduced user equipment capability determined by another core network function.

[0042] According to one aspect, an apparatus is provided, the apparatus including components configured to: receive a registration request message from a user equipment via a base station, the registration request message indicating that the user equipment supports multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiate with the user equipment a reduced user equipment capability, the reduced user equipment capability being used by the base station to: configure the user equipment to communicate with the base station when the user equipment has the capability to simultaneously register to a single network or multiple networks using the same access type.

[0043] According to one aspect, an apparatus is provided, the apparatus including a circuit system configured to perform: receiving a registration request message from a user equipment via a base station, the registration request message indicating that the user equipment supports multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiating with the user equipment a reduced user equipment capability, the reduced user equipment capability to be used by the base station for: configuring the user equipment to communicate with the base station when the user equipment has multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0044] According to one aspect, a method is provided, the method comprising: receiving a registration request message from a user equipment via a base station, the registration request message indicating that the user equipment supports multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiating with the user equipment a reduced user equipment capability, the reduced user equipment capability being used by the base station to: configure the user equipment to communicate with the base station when the user equipment has the capability to register multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0045] Negotiating a reduction in user equipment capabilities with the user equipment may include: sending a registration acceptance message containing information to the user equipment via a base station, the information indicating a reduction in user equipment capabilities, wherein the reduction in device capabilities is determined by the device; and receiving a registration completion message from the user equipment, the registration completion message indicating confirmation of the reduction in user equipment capabilities determined by the device.

[0046] Negotiating a reduction in user equipment capabilities with the user equipment may include: receiving a registration request message from the user equipment via a base station, the registration request message indicating a reduction in user equipment capabilities, wherein the reduction in device capabilities is determined by the user equipment; and sending a registration acceptance message to the user equipment via the base station, the registration acceptance message indicating: confirmation of the reduction in user equipment capabilities determined by the user equipment or an alternative reduction in user equipment capabilities, wherein the alternative reduction in user equipment capabilities is determined by the device.

[0047] The method may include: sending a request to another core network function to determine full user equipment capabilities and at least one reduced user equipment capability; and receiving from the other core network function a first identifier identifying the full user equipment capability determined by the other core network function, the full user equipment capability determined by the other core network function, at least one second identifier identifying at least one reduced user equipment capability determined by the other core network function, and at least one reduced user equipment capability determined by the other core network function.

[0048] Another core network function may store a first identifier of the complete user equipment capability determined by the other core network function, the complete user equipment capability determined by the other core network function, at least one second identifier of at least one reduced user equipment capability determined by the other core network function, and at least one reduced user equipment capability determined by the other core network function.

[0049] The method may include: sending a first identifier and at least one second identifier to the user equipment and to the base station via the base station, the first identifier identifying full user equipment capabilities determined by another core network function, and the at least one second identifier identifying at least one reduced user equipment capability determined by another core network function.

[0050] According to one aspect, a computer program is provided, comprising computer-executable code, which, when run on at least one processor, is configured to perform: receiving a registration request message from a user equipment via a base station, the registration request message instructing the user equipment to support multiple simultaneous registrations to a single network or multiple networks using the same access type; and negotiating with the user equipment a reduced user equipment capability, the reduced user equipment capability to be used by the base station for: configuring the user equipment to communicate with the base station when the user equipment has the capability to simultaneously register to a single network or multiple networks using the same access type.

[0051] According to one aspect, a computer-readable medium is provided that stores program instructions for performing at least one of the methods described above.

[0052] According to one aspect, a non-transitory computer-readable medium is provided, on which program instructions are stored for performing at least one of the methods described above.

[0053] According to one aspect, a non-volatile tangible storage medium is provided, on which program instructions are stored for performing at least one of the methods described above.

[0054] Many different aspects have been described above. It should be understood that other aspects can be provided through any combination of two or more of the aspects mentioned above.

[0055] Various other aspects are also described in the following detailed description and the appended claims. List of abbreviations Attached Figure Description

[0056] Embodiments will now be described by way of example only with reference to the accompanying drawings, in which:

[0057] Figure 1 A schematic diagram of a 5G system is shown;

[0058] Figure 2 A schematic diagram of the control device is shown;

[0059] Figure 3 A schematic diagram of the user equipment is shown;

[0060] Figure 4 The signaling diagrams for two implementations used to manage multiple simultaneous registrations to a single or multiple networks using the same access type are shown.

[0061] Figure 5 A block diagram is shown of a method performed by access and mobility management functions for managing multiple simultaneous registrations to a single or multiple networks using the same access type;

[0062] Figure 6 A block diagram is shown illustrating a method, executed by a user equipment, for managing multiple simultaneous registrations to a single network or multiple cellular networks using the same access type; and

[0063] Figure 7 A schematic diagram of a non-volatile storage medium for storing instructions is shown. These instructions, when executed by the processor, allow the processor to perform... Figure 5 and Figure 6 One or more steps in the method. Detailed Implementation

[0064] In the following explanation, certain embodiments are described with reference to mobile communication devices capable of communicating via wireless cellular systems and mobile communication systems serving such mobile communication devices. Before explaining the exemplary embodiments in detail, refer to... Figure 1 , Figure 2 ,as well as Figure 3 Briefly explain some general principles of wireless communication systems, their access systems, and mobile communication devices to help understand the technology behind the described examples.

[0065] Figure 1 A schematic diagram of a 5G system (5GS) is shown. 5GS may include user equipment (UE) and a public terrestrial mobile network (PLMN). The PLMN may include an LTE PLMN, a 5G PLMN, or a subsequent generation PLMN.

[0066] A 5G PLMN may include a 5G (Radio) Access Network (5G(R)AN), a 5G Core Network (5GC), one or more Application Functions (AFs), and one or more Data Networks (DNs). A UE may be registered to a single PLMN or multiple PLMNs. As used herein, the term "multiple" refers to two or more, or a plural number.

[0067] 5G(R)AN may include one or more gNodeB (gNB) distributed unit functions connected to one or more gNodeB (gNB) centralized unit functions.

[0068] 5GC may include: Access and Mobility Management Function (AMF), Session Management Function (SMF), Authentication Server Function (AUSF), User Data Management (UDM), User Plane Function (UPF), Network Openness Function (NEF), Unified Data Repository (UDR), Application Function (AF), Location Management Function (LMF), and / or UE Capability Management Function.

[0069] Figure 2 The diagram illustrates the control Figure 1An example of a control device 200 for the functions of (R)AN or 5GC is shown. The control device may include at least one random access memory (RAM) 211a, at least one read-only memory (ROM) 211b, at least one processor 212, 213, and an input / output interface 214. At least one processor 212, 213 may be coupled to RAM 211a and ROM 211b. At least one processor 212, 213 may be configured to execute appropriate software code 215. Software code 215 may, for example, allow the execution of one or more steps to perform one or more aspects of this aspect. Software code 215 may be stored in ROM 211b. Control device 200 may be interconnected with another control device 200 that controls another function of the 5G(R)AN or 5GC. In some embodiments, each function of (R)AN or 5GC includes control device 200. In alternative embodiments, two or more functions of (R)AN or 5GC may share a control device.

[0070] Figure 3 An example of UE 300 is illustrated, such as Figure 1 The UE 300 shown is an example of a device capable of transmitting and receiving wireless signals. Non-limiting examples include user equipment, mobile station (MS) or mobile device (such as a mobile phone or so-called "smartphone"), computer equipped with a wireless interface card or other wireless interface facility (such as a USB adapter), personal data assistant (PDA) or tablet computer equipped with wireless communication capabilities, machine-type communication (MTC) device, cellular Internet of Things (CIoT) device, or any combination of these devices. The UE 300 can provide, for example, communication for carrying data. Communication can be one or more of voice, email, text messages, multimedia, data, machine data, etc.

[0071] UE 300 can receive signals via air or radio interface 307 through appropriate means for receiving, and can transmit signals via appropriate means for transmitting radio signals. Figure 3 In the diagram, the transceiver device is schematically represented by block 306. The transceiver device 306 can be provided, for example, by means of a wireless component and an associated antenna arrangement. The antenna arrangement can be located inside or outside the mobile device.

[0072] UE 300 may be equipped with at least one processor 301, at least one memory ROM 302a, at least one RAM 302b, and other possible components 303 for software and hardware-assisted execution of tasks it is designed to perform, including controlling access to and communication with access systems and other communication devices. At least one processor 301 is coupled to RAM 302b and ROM 302a. At least one processor 301 may be configured to execute appropriate software code 308. The software code 308 may, for example, allow the execution of one or more aspects of this aspect. The software code 308 may be stored in ROM 302a.

[0073] The processor, storage, and other related control devices can be mounted on a suitable circuit board and / or chipset. This feature is indicated by reference numeral 304. The device may optionally have a user interface, such as a keyboard 305, a touch-sensitive screen or touchpad, or a combination thereof. Depending on the type of device, one or more of a display, speaker, and microphone may optionally be provided.

[0074] One or more aspects of this disclosure relate to managing simultaneous registration to a single network or to multiple networks (e.g., one or more networks or a plurality of networks).

[0075] A UE can simultaneously register with a single network or multiple networks using the same access type. A UE can simultaneously establish Radio Resource Control (RRC) connections with a single network or multiple networks. RRC connections can serve the same Packet Data Unit (PDU) sessions. For example, an RRC connection can serve different parts of the same Multiple Access (MA) PDU. Alternatively, each RRC connection can serve different PDU sessions.

[0076] In this disclosure, a network may refer to a public terrestrial mobile network (PLMN), such as an LTE PLMN, 5G PLMN, or 6G PLMN, or a standalone non-public network (SNPN), such as an LTE SNPN, 5G SNPN, or 6G SNPN.

[0077] In this disclosure, access type can refer to 3GPP access or non-3GPP access. 3GPP access can refer to cellular access, such as LTE access, 5G access, or 6G access. Non-3GPP access can refer to non-cellular access, such as Wi-Fi access.

[0078] For example, a UE can have multiple simultaneous registrations to a single PLMN or to multiple PLMNs. Multiple simultaneous registrations can use the same access type (e.g., 3GPP access). A UE can establish multiple RRC connections with a single PLMN (e.g., a first RRC connection with gNB1 of PLMN and a second RRC connection with gNB2 of PLMN) or multiple RRC connections with multiple PLMNs (e.g., a first RRC connection with gNB1 of PLMN1 and a second RRC connection with gNB2 of PLMN2).

[0079] In this disclosure, UE capability can refer to UE radio capability, UE radio access capability, UE radio capability information, or UE radio access capability information. UE capability can include complete UE capability or reduced UE capability.

[0080] Complete UE capabilities may include at least one of the following: the number of component carriers supported by the UE, the preference for the maximum number of component carriers supported by the UE in a cell group, or other UE capability information. Complete UE capabilities may include UE radio capability information as defined in 3GPP TS 38.300. Complete UE capabilities may include information about or related to the radio access technologies supported by the UE (e.g., power class, frequency band, etc.). A detailed list of UE capability information can be found in 3GPP TS 38.306 and 3GPP TS 36.306.

[0081] When requested by the network (e.g., when the network requests UE capabilities), the UE can report its complete capabilities. The network can also request which UE capabilities the UE must report based on frequency band information. Complete UE capabilities can be represented by a full UE capability ID. Instead of exchanging UE capabilities, the full UE capability ID can be exchanged in non-access stratum signaling over the air and in network signaling.

[0082] The full UE capability may be large enough that the AMF may not want to transmit it via the radio interface each time the UE's Connection Management (CM) state transitions from CM-IDLE to CM-CONNECTED. To avoid this radio overhead, the AMF can store the full UE capability between the UE's CM-IDLE and RM-REGISTERED states. The AMF can then send the latest full UE capability to the RAN in an N2REQUEST message.

[0083] During the duration the UE is in the RRC_CONNECTED or RRC_INACTIVE state, the RAN can store the complete UE capabilities, which are received in the N2 message or obtained from the UE.

[0084] It will be understood that, although one or more aspects will be discussed in the context of 5G systems below to increase understanding, these aspects can be applied to other cellular systems, such as previous generations (e.g., LTE systems) or subsequent generations (e.g., 6G systems).

[0085] In a 5G system, a UE can simultaneously register with a first 5G PLMN and a second 5G PLMN. The first 5G PLMN has a first (R)AN including a first gNB, and the second 5G PLMN has a second (R)AN including a second gNB. The UE can simultaneously establish a first RRC connection via the first gNB to the first 5G PLMN and a second RRC connection via the second gNB to the second 5G PLMN. In other words, the UE can have a first RRC connection via the first gNB to the first 5G PLMN, and simultaneously have a second RRC connection via the second gNB to the second 5G PLMN.

[0086] In this scenario, the first gNB may be unaware of the existence of the second RRC connection. Therefore, the first gNB can assume that the full UE capabilities can be used to configure the UE to communicate with the first gNB to serve the first RRC connection. However, this may lead to RRC reconfiguration failure, as follows.

[0087] For example, assume that full UE capabilities may include four component carriers in the frequency band. Initially, the UE may register with the first 5G PLMN. The UE may establish a first RRC connection with the first 5G PLMN via the first gNB. The first gNB may configure the UE to communicate with the first gNB based on the full UE capabilities. The first gNB may configure the UE to use two component carriers in the frequency band to communicate with the first gNB.

[0088] In this disclosure, the term dual-booting can refer to the ability to perform bootstrapping, handover, and offloading of traffic using multiple access PDU sessions (MA PDU sessions) on two 3GPP accesses. Note that the Access Traffic Bootstrapping, Handover, and Offloading (ATSSS) feature available in versions prior to 3GPP Rel-18 allowed the use of MA PDU sessions on both 3GPP and non-3GPP accesses to bootstrap, handover, and offload traffic.

[0089] Subsequently, the UE can register with the second 5G PLMN. The UE can establish a second RRC connection with the second 5G PLMN via the second gNB. Registration with the second 5G PLMN can be triggered when the UE wants to bootstrap, handover, or offload traffic between two or more 3GPP access points. Registration with the second 5G PLMN can be triggered by the UE's application layer. The second gNB can configure the UE to communicate with it based on the full UE capabilities. The second gNB can configure the UE to communicate with it using three component carriers in the frequency band. This will cause RRC reconfiguration to fail because the first gNB has already configured the UE to communicate with it using two component carriers in the frequency band.

[0090] One or more aspects of this disclosure provide a technical solution to avoid RRC reconfiguration failure when a UE registers simultaneously with a single 5G PLMN or multiple 5G PLMNs (e.g., one or more 5G PLMNs or multiple 5G PLMNs) using the same access type (e.g., 3GPP access).

[0091] More generally, one or more aspects of this disclosure provide a technical solution to avoid reconfiguration failure when a UE registers simultaneously with a single network or multiple networks (e.g., one or more networks or a plurality of networks) using the same access type (e.g., 3GPP access).

[0092] During the registration period

[0093] The UE can send a registration request message to the AMF via the gNB, which indicates that the UE supports simultaneous registration with a single 5G PLMN or multiple 5G PLMNs using the same access type (e.g., 3GPP access).

[0094] The registration request message can instruct the UE to support simultaneous registration with a single 5G PLMN or multiple 5G PLMNs for access traffic redirection, handover, and offloading with statically reduced UE capabilities. Here, "statically reduced UE capabilities" can mean that the reduced UE capabilities are fixed throughout the entire registration period (e.g., the complete duration of a registration period). Alternatively, "reduced UE capabilities" can mean less than the full UE capability.

[0095] The registration request message can explicitly or implicitly indicate to the UE that it supports simultaneous registration with multiple 5G PLMNs.

[0096] The registration request message may include a registration identifier, which implicitly indicates that the UE supports simultaneous registration with a single 5G PLMN or multiple 5G PLMNs. That is, the presence of a registration identifier in the registration request message indicates that the UE supports simultaneous registration with a single 5G PLMN or multiple 5G PLMNs. Alternatively, the presence of additional indicators or new information (e.g., registration ID) can explicitly indicate that the UE supports simultaneous registration with multiple 5G PLMNs.

[0097] AMF can determine, based on the registration request message, whether the UE supports simultaneous registration with a single 5G PLMN or multiple 5G PLMNs using the same access network type.

[0098] When a UE does not support simultaneous registration with a single 5G PLMN or multiple 5G PLMNs using the same access network type, or when a UE supports simultaneous registration with a single 5G PLMN or multiple 5G PLMNs using the same access network type, but is not currently simultaneously registering with a single 5G PLMN or multiple 5G PLMNs using the same access network type, the AMF may determine that the gNB should not be configured to communicate with the gNB based on the full UE capabilities.

[0099] When a UE supports simultaneous registration and registers with a single 5G PLMN or multiple 5G PLMNs simultaneously using the same access network type, the AMF can determine that the gNB should configure the UE to communicate with the BS based on the reduced UE capabilities.

[0100] More specifically, when a UE supports simultaneous registration with a single 5G PLMN or multiple 5G PLMNs using the same access network type, and simultaneously registers with a single 5G PLMN or multiple 5G PLMNs using the same access network type based on local configuration or operator policy, the AMF can determine that the gNB should configure the UE to communicate with the BS based on the reduced UE capabilities.

[0101] In this disclosure, the term UE Radio Capability Signaling Optimization (RACS) may refer to the following features.

[0102] As UE capabilities increase (e.g., driven by additional frequency bands and combinations thereof for E-UTRA and NR), efficient methods for signaling UE capabilities via radio interfaces and other network interfaces can be defined according to RACS. RACS can operate by assigning identifiers to represent UE capabilities. This identifier can be referred to as the UE capability ID. The capability ID can be an alternative for signaling UE capabilities within NG-RAN, from NG-RAN to E-UTRAN, from AMF to NG-RAN, and between RACS-enabled CN nodes via radio interfaces.

[0103] A UE capability ID can be a short pointer with the format defined in 3GPP TS 23.003, which can be used to uniquely identify a UE capability. The UE capability ID can be assigned by the serving PLMN or by the UE manufacturer. When a UE capability ID is signaled, its type (assigned by the UE manufacturer or the PLMN) can be distinguished.

[0104] The UCMF can store dictionary entries (e.g., mappings) associated with UE capability IDs assigned by the PLMN or the manufacturer. The UCMF can store all UE capability IDs in the PLMN and can be responsible for assigning each PLMN-assigned UE capability ID within that PLMN. The UCMF can store UE capability IDs together with (e.g., in association with) UE capabilities.

[0105] In the first implementation where the UE does not support radio capability signaling optimization, when the UE registers with a single PLMN or multiple 5G PLMNs simultaneously using the same access network type, the UE can negotiate reduced UE capabilities with the AMF via the gNB, which can then be used by the gNB to configure UE communication with the gNB. In this way, the risk of RRC reconfiguration failure (explained above) can be reduced.

[0106] The UE can receive a registration acceptance message from the AMF via the gNB, indicating reduced UE capabilities determined by the AMF. The registration acceptance message may include reduced UE capabilities or control information to derive the reduced UE capabilities (e.g., a percentage relative to full UE capabilities). Reduced UE capabilities may restrict simultaneous registration to two 5G PLMNs (e.g., dual registration). The UE can send a registration completion message to the AMF via the gNB, indicating confirmation (e.g., agreement) of the reduced device capabilities determined by the AMF.

[0107] The AMF can send a message to the gNB indicating a reduced UE capability as determined by the AMF. This message may include reduced UE capability or control information to derive the reduced UE capability (e.g., a percentage relative to full UE capability). This message can be sent via the NGAP interface.

[0108] Alternatively, the AMF may not send a message to the gNB indicating the reduced UE capabilities determined by the AMF.

[0109] In the second implementation where the UE does not support radio capability signaling optimization, when the UE registers with a single 5G PLMN or multiple 5G PLMNs simultaneously using the same access network type, the UE can negotiate reduced UE capabilities with the AMF via the gNB, which can then be used by the gNB to configure UE communication with the gNB. In this way, the risk of RRC reconfiguration failure (explained above) can be reduced.

[0110] The UE can send a registration request message to the AMF via the gNB, indicating a reduction in UE capabilities determined by the UE. The reduction in UE capabilities can be determined based on the UE simultaneously registering with a single 5G PLMN or multiple 5G PLMNs using the same access network type. The registration request message may include the reduced UE capabilities or control information to derive the reduced UE capabilities (e.g., a percentage relative to full UE capabilities). The reduced UE capabilities may be limited to simultaneous registration with two 5G PLMNs (e.g., dual registration). The UE can receive a registration acceptance message from the AMF via the gNB, indicating either confirmation (e.g., agreement) of the reduced UE capabilities determined by the UE or confirmation (e.g., agreement) of the reduced UE capabilities determined by the AMF.

[0111] The AMF can send a message to the gNB indicating a reduced UE capability determined by the UE or by the AMF. This message may include the reduced UE capability determined by the UE, or the reduced UE capability determined by the AMF, or control information (e.g., a percentage relative to full UE capability) used to derive the reduced UE capability determined by the UE or the reduced UE capability determined by the AMF. This message can be sent via the NGAP interface.

[0112] Alternatively, the AMF may not send a message to the gNB indicating the reduced UE capabilities determined by the AMF.

[0113] Figure 4 This demonstrates compatibility with 3GPP TS 23.502 (v18.2.0). Figure 4 2.2.2.2-1 Signaling diagrams for the first and second implementations.

[0114] In the third implementation of UE-supported radio capability signaling optimization, the AMF can send a request to the UCMF to determine the full UE capabilities and the reduced UE capabilities. The UCMF can then determine the full UE capabilities and the reduced UE capabilities.

[0115] When a UE registers with a single 5G PLMN and when a single RRC connection has been established, the full UE capabilities can be configured by the gNB to allow the UE to communicate with the gNB.

[0116] When a UE registers with a single 5G PLMN or multiple 5G PLMNs simultaneously using the same access type, and when a UE has already established multiple RRC connections simultaneously, the reduced UE capabilities can be used by the gNB to configure UE communication with the gNB.

[0117] The UCMF can determine the complete UE capability and at least one degraded UE capability. The UCMF can determine a first identifier (i.e., first UE capability ID) that identifies the complete UE capability and at least one second identifier (i.e., at least one second UE capability ID) that identifies the at least one degraded UE capability. The UCMF can store the complete UE capability, at least one degraded UE capability, the first identifier that identifies the complete UE capability, and at least one second identifier that identifies the at least one degraded UE capability.

[0118] UCMF can determine full UE capabilities and at least one reduced UE capability based on information provided by the UE's manufacturer or supplier, or by the UCMF's PLMN operator.

[0119] The AMF can receive from the UCMF a first identifier identifying the complete UE capability determined by the UCMF, the complete UE capability determined by the UCMF, at least one second identifier identifying at least one reduced UE capability determined by the UCMF, and at least one reduced UE capability determined by the UCMF.

[0120] The AMF can send a registration acceptance message to the UE via the gNB, the registration acceptance message indicating a first identifier that identifies the full UE capability determined by the UCMF, and at least one second identifier that identifies at least one reduced UE capability determined by the UCMF and at least one reduced UE capability determined by the UCMF.

[0121] The AMF may send (e.g., via NGAP) a message to the gNB indicating a first identifier that identifies the full UE capability determined by the UCMF, and at least one second identifier that identifies at least one reduced UE capability determined by the UCMF and at least one reduced UE capability determined by the UCMF.

[0122] Reduced UE capability can be a percentage of full UE capability. For example, reduced UE capability could be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or 90% of full UE capability. In other words, full UE capability is a greater capability than reduced UE capability. Full device capability refers to non-reduced UE capability. For example, if full UE capability allows the use of multiple component carriers in a frequency band, reduced UE capability allows the use of fewer component carriers in the frequency band.

[0123] After registration

[0124] A UE can register with a single 5G PLMN. A UE can establish an RRC connection with a single 5G PLMN.

[0125] In the first and second implementations where the UE does not support radio capability signaling optimization, the UE can send information to the gNB indicating its full UE capabilities. The UE can send this information to the gNB indicating its full UE capabilities due to registration with a single 5G PLMN (e.g., when registering with a single 5G PLMN). This can trigger the gNB to configure UE communication with the gNB based on the full UE capabilities.

[0126] If the gNB has not yet received complete UE capabilities from the UE or AMF, the gNB can receive complete UE capabilities from the UE or AMF. The gNB can receive complete UE capabilities from the AMF through the NGAP interface.

[0127] In the third implementation where the UE supports radio capability signaling optimization, the UE can send a first identifier identifying the complete UE capabilities to the gNB. This can trigger the gNB to configure the UE to communicate with the gNB based on the complete UE capabilities. The gNB can obtain the complete UE capabilities determined by the UCMF from the AMF.

[0128] Subsequently, the UE can register with another 5G PLMN. The UE can register with multiple 5G PLMNs simultaneously. The UE can establish RRC connections with multiple 5G PLMNs simultaneously. This can be triggered to achieve dual bootstrapping (e.g., MA PDU session). This can be triggered by the UE's application layer.

[0129] It should be understood that even if a UE can register with a single 5G PLMN or multiple 5G PLMNs simultaneously, and can simultaneously establish RRC connections with multiple 5G(R)ANs with a single 5G PLMN or multiple 5G PLMNs, the RRC connections may not be active at the same time.

[0130] The UE can determine whether it is registered with multiple 5G PLMNs simultaneously.

[0131] In both the first and second implementations where the UE does not support radio capability signaling optimization, the UE can send information to the gNB indicating a reduction in its capabilities. The UE can also send this information to the gNB indicating a reduction in its capabilities due to simultaneous registration with multiple 5G PLMNs. This can trigger the gNB to configure UE communication based on the reduced device capabilities.

[0132] If the gNB has not yet received reduced UE capabilities from the UE or AMF, the gNB can receive reduced UE capabilities from the UE or AMF. The gNB can receive reduced UE capabilities from the AMF via the NGAP interface.

[0133] In the third implementation where the UE supports radio capability signaling optimization, the UE can send a second identifier indicating a reduced UE capability to the gNB to trigger the gNB to configure UE communication with the gNB based on the reduced device capabilities. The gNB can obtain the complete UE capabilities determined by the UCMF from the AMF.

[0134] The UCMF service can support one or more of the above aspects.

[0135] The Nucmf_Provisioning service can support the creation, deletion, or updating of UCMF dictionary entries (or multiple entries) for UE capability IDs assigned by the manufacturer.

[0136] When requested by the AMF, the Nucmf_UECapabilityManagement service can support the allocation of full UE capabilities and reduced UE capabilities.

[0137] The Nucmf_UECapabilityManagement_Assign service request can support requests for both full and reduced UE capabilities. If the AMF identifies during registration that a UE can register with multiple 5G PLMNs simultaneously, the AMF can use the Nucmf_UECapabilityManagement_Assign service to request both full and reduced UE capabilities.

[0138] The Nucmf_UECapabilityManagement service can support providing AMF with both full UE capabilities and reduced UE capabilities.

[0139] The Nucmf_UECapabilityManagement service can support providing the AMF with a first identifier that identifies the full UE capability and at least one second identifier that identifies at least one degraded UE capability.

[0140] When AMF is subscribed, the Nucmf_UECapabilityManagement service can support notification of changes to full UE radio access capabilities and reduced UE radio access capabilities.

[0141] Figure 5 A block diagram is shown illustrating a method performed by the UE for managing simultaneous registration with a single network or multiple networks using the same access type.

[0142] At step 500, the UE sends a registration request message to the AMF via the BS. The registration request message indicates that the UE supports simultaneous registration with a single network or multiple networks using the same access type.

[0143] At step 502, when the UE has multiple simultaneous registrations to a single network or multiple networks using the same access type, the UE negotiates a reduced UE capability with the AMF via the BS. This reduced UE capability is used by the BS to configure communication between the UE and the BS.

[0144] Figure 6 A block diagram is shown illustrating a method performed by the AMF for managing multiple simultaneous registrations to a single network or multiple networks using the same access type.

[0145] At step 600, the AMF can receive a registration request message from the UE via the BS, which indicates that the UE supports simultaneous registration with a single network or multiple networks using the same access type.

[0146] At step 602, when the UE has multiple simultaneous registrations to a single network or multiple networks using the same access type, the AMF can negotiate with the UE a reduced UE capability, which is used by the BS to configure the UE to communicate with the BS.

[0147] Figure 7 A schematic diagram of a non-volatile storage medium 700 is shown, which stores instructions that, when executed by a processor, allow the processor to perform... Figure 5 and Figure 6 One or more steps in the method.

[0148] It should be noted that although exemplary embodiments have been described above, several changes and modifications can be made to the disclosed technical solutions without departing from the scope of the present invention.

[0149] Therefore, these embodiments can vary within the scope of the appended claims. Generally, some embodiments can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, but the embodiments are not limited thereto. Although various embodiments may be illustrated and described as block diagrams, flowcharts, or using some other graphical representation, it is well understood that, by way of non-limiting example, the blocks, apparatuses, systems, techniques, or methods described herein can be implemented in hardware, software, firmware, dedicated circuitry or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof.

[0150] These embodiments can be implemented by computer software stored in memory and executable by at least one data processor of the entity involved, or by hardware, or by a combination of software and hardware. Furthermore, it should be noted in this regard that any process (e.g., Figure 5 and Figure 6The process in the program can represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions. Software can be stored on physical media, such as memory chips or memory blocks implemented within a processor, magnetic media such as hard disks or floppy disks, and optical media such as DVDs and their data variants, CDs, etc.

[0151] The memory can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. The data processor can be of any type suitable for the local technical environment and, by way of non-limiting example, can include one or more of the following: general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), gate-level circuits, and processors based on multi-core processor architectures.

[0152] Alternatively or additionally, some embodiments may be implemented using a circuit system. This circuit system may be configured to perform one or more of the foregoing functional and / or method steps. The circuit system may be provided in a base station and / or communication equipment.

[0153] As used in this application, the term "circuit system" may refer to one or more or all of the following: (a) Hardware circuit implementation only (such as implementation using only analog and / or digital circuit systems); (b) A combination of hardware circuits and software, such as: (i) A combination of (multiple) analog and / or digital hardware circuits with software / firmware; and (ii) Any portion of the hardware processor(s) having software (including (multiple) digital signal processors), software, and (multiple) memories, working together to enable an apparatus (such as a communication device or base station) to perform the various functions previously described; and (c) (Multiple) hardware circuits and / or (multiple) processors, such as (multiple) microprocessors or portions of (multiple) microprocessors, which require software (e.g., firmware) to operate, but may be absent when software is not required to operate.

[0154] The definition of "circuit system" applies to all uses of the term in this application, including in any claim. As another example, as used in this application, the term "circuit system" also encompasses only hardware circuitry or a processor (or multiple processors) or portions of hardware circuitry or a processor and its accompanying software and / or firmware implementation. The term "circuit system" also encompasses, for example, integrated devices.

[0155] The foregoing description provides a complete and informative description of some embodiments through exemplary and non-limiting examples. However, when read in conjunction with the accompanying drawings and appended claims, various modifications and adjustments will become apparent to those skilled in the art in light of the above description. Nevertheless, all such and similar modifications to the teachings will still fall within the scope defined in the appended claims.

Claims

1. An apparatus comprising at least one processor and at least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform at least the following: The device sends a registration request message to the core network function via the base station, the registration request message indicating that the device supports simultaneous registration with a single network or multiple networks using the same access type; and The reduced device capabilities negotiated between the base station and the core network functions will be used by the base station to configure the device to communicate with the base station when the device has multiple simultaneous registrations to a single network or multiple networks using the same access type.

2. The apparatus of claim 1, wherein the registration request message explicitly or implicitly indicates that the apparatus supports simultaneous registration with a single network or multiple networks using the same access type.

3. The apparatus according to claim 1 or claim 2, wherein the registration request message includes: The field "Using the same access type to register with a single network or multiple networks simultaneously" explicitly indicates that the device supports using the same access type to register with a single network or multiple networks simultaneously. or The registration request message includes a registration identifier field, which implicitly indicates that the device supports simultaneous registration with a single network or multiple networks using the same access type.

4. The apparatus according to any one of claims 1 to 3, wherein the reduced apparatus capability negotiated via the base station and the core network function comprises: The registration acceptance message is received from the core network function via the base station, the registration acceptance message indicating the reduced device capability, wherein the reduced device capability is determined by the core network function; as well as The registration completion message is sent to the core network function via the base station, and the registration completion message indicates confirmation of the reduced device capability determined by the core network function.

5. The apparatus of claim 1, wherein the reduced apparatus capability negotiated via the base station and the core network function comprises: The registration request message is sent to the core network function via the base station. The registration request message indicates the reduced device capability, wherein the reduced device capability is determined by the device. as well as The registration acceptance message is received from the core network function via the base station, the registration acceptance message indicating: confirmation of the reduced device capability determined by the device or alternative reduced device capability, wherein the alternative reduced device capability is determined by the core network function.

6. The apparatus according to any one of claims 1 to 5, wherein the at least one memory stores instructions, the instructions, when executed by the at least one processor, further cause the apparatus to perform at least: The base station receives a registration acceptance message from the core network function, the registration acceptance message indicating a first identifier and at least one second identifier, the first identifier identifying full device capability, and the at least one second identifier identifying at least one reduced device capability.

7. The apparatus of claim 6, wherein the at least one memory stores instructions, the instructions, when executed by the at least one processor, further cause the apparatus to perform at least: Based on performing registration with a single network, a message including the first identifier is sent to the base station, the first identifier identifying the complete device capabilities, and the message including the first identifier is configured to cause the base station to configure the device to communicate with the base station based on the complete device capabilities.

8. The apparatus of claim 6 or claim 7, wherein the at least one memory stores instructions, which, when executed by the at least one processor, further cause the apparatus to perform at least: Based on performing multiple simultaneous registrations to a single network or multiple networks using the same access type, a message including the at least one second identifier is sent to the base station, the at least one second identifier identifying the at least one reduced device capability, and the message including the at least one second identifier is configured to cause the base station to configure the device to communicate with the base station based on the reduced device capability.

9. The apparatus according to any one of claims 1 to 5, wherein the at least one memory stores instructions, the instructions, when executed by the at least one processor, further cause the apparatus to perform at least: Based on performing multiple simultaneous registrations to a single network or multiple networks using the same access type, a message including information is sent to the base station, the information indicating reduced device capabilities due to multiple registrations to a single network or multiple networks using the same access type, the message including the information is configured to: cause the base station to obtain the reduced device capabilities from the core network functions, and configure the device to communicate with the base station based on the reduced device capabilities.

10. The apparatus according to any one of claims 7 to 9, wherein the first identifier identifying the full apparatus capability, the at least one second identifier identifying the at least one reduced apparatus capability, or the information indicating the reduced apparatus capability due to multiple registrations to a single network or multiple networks using the same access type, is sent in a radio resource control message.

11. The apparatus according to any one of claims 1 to 10, wherein the reduced apparatus capability comprises a percentage of the full apparatus capability.

12. The apparatus of claim 11, wherein the complete apparatus capability includes at least one of the following: The number of component carriers; or The number of neighborhood groups.

13. The apparatus according to any one of claims 1 to 12, wherein simultaneous registration with a single network or multiple networks using the same access type comprises: A wireless connection can be established simultaneously with a single cellular network or multiple networks of the same access type.

14. An apparatus comprising at least one processor and at least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform at least the following: The user equipment receives a registration request message from the base station, the registration request message indicating that the user equipment supports simultaneous registration with a single network or multiple networks using the same access type; and The base station negotiates a reduction in user equipment capabilities with the user equipment, and the reduced user equipment capabilities will be used by the base station to configure the user equipment to communicate with the base station when the user equipment has multiple simultaneous registrations to a single network or multiple networks using the same access type.

15. The apparatus of claim 14, wherein negotiating a reduction in user equipment capabilities with the user equipment comprises: The base station sends a registration acceptance message containing information to the user equipment, the information indicating the reduced capabilities of the user equipment, wherein the reduced capabilities are determined by the device; and The user equipment receives a registration completion notification, which indicates confirmation of the reduced user equipment capabilities determined by the device.

16. The apparatus of claim 14, wherein negotiating the reduced user equipment capabilities with the user equipment comprises: The registration request message is received from the user equipment via the base station, the registration request message indicating the reduced user equipment capabilities, wherein the reduced device capabilities are determined by the user equipment; as well as The base station sends a registration acceptance message to the user equipment, the registration acceptance message indicating: confirmation of the reduced user equipment capability determined by the user equipment or alternative reduced user equipment capability, wherein the alternative reduced user equipment capability is determined by the device.

17. The apparatus according to any one of claims 14 to 16, wherein the at least one memory stores instructions, which, when executed by the at least one processor, cause the apparatus to perform at least: Send a request to another core network function to determine the full UE capabilities and at least one degraded UE capability; and The system receives from the other core network function a first identifier identifying the complete user equipment capability determined by the other core network function, the complete user equipment capability determined by the other core network function, at least one second identifier identifying at least one reduced user equipment capability determined by the other core network function, and at least one reduced user equipment capability determined by the other core network function.

18. The apparatus of claim 17, wherein the at least one memory stores instructions, which, when executed by the at least one processor, cause the apparatus to perform at least: The first identifier and the at least one second identifier are transmitted via the base station to the user equipment and to the base station, the first identifier identifying the full user equipment capability determined by the other core network function, and the at least one second identifier identifying the at least one reduced user equipment capability determined by the other core network function.

19. A method comprising: The device sends a registration request message to the core network function via the base station, the registration request message indicating that the device supports simultaneous registration with a single network or multiple networks using the same access type. as well as The reduced device capabilities negotiated between the base station and the core network functions will be used by the base station to configure the device to communicate with the base station when the device has multiple simultaneous registrations to a single network or multiple networks using the same access type.

20. A method comprising: The user equipment receives a registration request message from the base station, the registration request message indicating that the user equipment supports simultaneous registration with a single network or multiple networks using the same access type; as well as The base station negotiates a reduction in user equipment capabilities with the user equipment, and the reduced user equipment capabilities will be used by the base station to configure the user equipment to communicate with the base station when the user equipment has multiple simultaneous registrations to a single network or multiple networks using the same access type.

21. A computer program comprising computer-executable instructions that, when executed on one or more processors, perform the steps of the method according to claim 19 or claim 20.

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