Wireless communication method and user equipment
The method and UE ensure multi-access functionality in wireless communication systems by exchanging support indications, addressing network compatibility issues and enabling simultaneous connectivity across different radio access networks.
Patent Information
- Application Number
- PCT/CN2024/124217
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2026-04-16
AI Technical Summary
Existing wireless communication systems, particularly in the transition to multi-access networks like 6G, face challenges in implementing multi-access functionality due to inconsistent support across different radio access networks, leading to inefficiencies and incomplete feature provisioning.
A method and user equipment (UE) that enables multi-access operation by exchanging indications of feature support between the UE and multiple radio access networks, ensuring both networks support the multi-access feature before enabling simultaneous connectivity.
Facilitates seamless multi-access operations by ensuring network compatibility, reducing operational inefficiencies and enabling simultaneous connectivity across multiple radio access networks.
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Figure CN2024124217_16042026_PF_FP_ABST
Abstract
Description
WIRELESS COMMUNICATION METHOD AND USER EQUIPMENTTECHNICAL FIELD
[0001] The present application relates to wireless communication, and more particularly, to a wireless communication method and a user equipment (UE) .BACKGROUND ART
[0002] The background description includes information that may be useful in understanding the present application. It is not an admission that any of the information provided herein is prior art or relevant to the application.
[0003] In cellular wireless communication systems developed by the Third Generation Partnership Project (3GPP) , user equipment (UE) is connected by a wireless link to a radio access network (RAN) . The RAN includes a set of base stations (BSs) which provide wireless links to UEs located in cells covered by the base station and an interface to a core network (CN) which provides overall network control. The RAN and CN each conduct respective functions in relation to the overall network. The so-called 4G Long Term Evolution (LTE) system, namely, an Evolved Universal Mobile Telecommunication System Territorial Radio Access Network (E-UTRAN) has been developed for a mobile access network where one or more macro-cells are supported by a base station known as an eNodeB or eNB (evolved NodeB) . Evolved from LTE, the so-called 5G or new radio (NR) systems where one or more cells are supported by a base station known as a gNB. Envisioned to succeed the current 5G networks, the 6G cellular system is the forthcoming generation of wireless communication technology.
[0004] Multi-access refers to integration of various connectivity technologies, such as Wi-Fi, 4G LTE and 5G NR, to enhance user experience and resilience in applications. A multi-access device is capable of simultaneously connecting to the same or different Public Land Mobile Network (PLMN) or Non-Public Networks (NPN) via two different access networks. To deploy multi-access functionality, both UEs and the network shall support this feature. In a large PLMN, the feature support may take some time, that is, in the transition period some network elements in the core network are upgraded to support the feature, while the others are not. Therefore, the UE needs to inform the network whether it supports the feature and the network needs to do the same.SUMMARY
[0005] An object of the present application is to propose a wireless communication method and a user equipment, which can implement multi-access functionality for a user equipment connecting to multiple radio access networks. This invention addresses scenarios when both access types are 3GPP accesses, e.g. 4G and 5G, 5G and 6G and so forth. The primary target scenario however is when 6G is specifically one of the access types, i.e. 3G and 6G, 4G and 6G, 5G and 6G, 6G and 7G. At the time of writing, however, 3GPP CT1 still has not specified 6G NAS protocol and therefore the final encoding of the messages cannot be provided now. Instead, in the below described Use case 1 and Use case 2 we provide protocol details to the 4G NAS and 5G NAS specifications.
[0006] In a first aspect of the present application, provided is a wireless communication method by a user equipment (UE) , including: when attaching to a first radio access network, sending to the first radio access network a first indication of whether the UE supports multi-access feature; receiving from the first radio access network a second indication of whether the first radio access network supports the multi-access feature; when attaching to a second radio access network in addition to the first radio access network, sending to the second radio access network a third indication of whether the UE supports the multi-access feature; receiving from the second radio access network a fourth indication of whether the second radio access network supports the multi-access feature; and performing multi-access operation if the UE supports the multi-access feature as indicated by the first indication and the third indication, and the received second indication and fourth indication indicate that both the first radio access network and the second radio access network support the multi-access feature.
[0007] In a second aspect of the present application, provided is a user equipment (UE) , including at least one memory configured to store program instructions; and at least one processor configured to execute the program instructions, which cause the at least one processor to: when attaching to a first radio access network, send to the first radio access network a first indication of whether the UE supports multi-access feature; receive from the first radio access network a second indication of whether the first radio access network supports the multi-access feature; when attaching to a second radio access network in addition to the first radio access network, send to the second radio access network a third indication of whether the UE supports the multi-access feature; receive from the second radio access network a fourth indication of whether the second radio access network supports the multi-access feature; and perform multi-access operation if the UE supports the multi-access feature as indicated by the first indication and the third indication, and the received second indication and fourth indication indicate that both the first radio access network and the second radio access network support the multi-access feature.
[0008] In a third aspect of the present application, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method.
[0009] In a fourth aspect of the present application, a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the above method.
[0010] In a fifth aspect of the present application, a computer readable storage medium, in which a computer program is stored, causes a computer to execute the above method.
[0011] In a sixth aspect of the present application, a computer program product includes a computer program, and the computer program causes a computer to execute the above method.
[0012] In a seventh aspect of the present application, a computer program causes a computer to execute the above method.DESCRIPTION OF DRAWINGS
[0013] In order to more clearly illustrate the embodiments of the present application or related art, the following figures that will be described in the embodiments are briefly introduced. It is obvious that the drawings are merely some embodiments of the present application, a person having ordinary skill in this field can obtain other figures according to these figures without paying the premise.
[0014] FIG. 1 is a schematic diagram illustrating a 5th-Generation (5G) architecture according to an embodiment of the present application.
[0015] FIG. 2 is a block diagram of a user equipment (UE) and one or more network devices in a communication network system according to an embodiment of the present application.
[0016] FIG. 3 is a flowchart of a wireless communication method according to an embodiment of the present application.
[0017] FIG. 4 is a flowchart of an illustrated example of a wireless communication method according to an embodiment of the present application.
[0018] FIG. 5 is a block diagram of a system for wireless communication according to an embodiment of the present application.DETAILED DESCRIPTION OF EMBODIMENTS
[0019] Embodiments of the disclosure are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. Specifically, the terminologies in the embodiments of the present application are merely for describing the purpose of the certain embodiment, but not to limit the disclosure.
[0020] In this document, the term “ / ” should be interpreted to indicate “and / or. ” A combination such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” or “A, B, and / or C” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any combination may contain one or more members of A, B, or C.
[0021] The following table includes some abbreviations used in some embodiments of the present application:
[0022] FIG. 1 shows a 5G architecture. Devices involved in the 5G architecture include UE, a Radio Access Network (RAN) , a User Plane Function (UPF) , a Data Network (DN) , an Access and Mobility Management Function (AMF) , a Session Management Function (SMF) , a Policy Control Function (PCF) , an Application Function (AF) , an Authentication Server Function (AUSF) , and Unified Data Management (UDM) . It is noted that this application may be applicable to the architecture shown in FIG. 1, but is not limited thereto. The application can also be applied to future communication system such as 6G system.
[0023] As shown in FIG. 1, the UPF plays a crucial role in the user plane architecture of the core network, specifically within the 5G Core (5GC) . The UPF is responsible for managing and forwarding user plane data traffic between the RAN and external data networks, such as the Internet or private networks. Policy related network elements mainly include the PCF, which enforced the policy by communicating these to the AMF, the SMF, the RAN, and the UE. The PCF determines policy rules for network behaviors. This may include deciding how network resources are allocated, ensuring efficiency of network capabilities. The SMF is mainly responsible for executing session management tasks. The AMF is mainly responsible for executing access and UE mobility management tasks. Policy transmission and update of the two network elements (the AMF and the SMF) are managed and controlled by the PCF.
[0024] FIG. 2 illustrates that, in some embodiments, a user equipment (UE) 10 and one or more network devices 20 in a communication network system 30 according to an embodiment of the present application are provided. The communication network system 30 includes the UE 10 and one or more network devices 20. The UE 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The one or more network devices 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement proposed functions, procedures and / or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and / or receives a radio signal.
[0025] The processor 11 or 21 may include application-specific integrated circuit (ASIC) , other chipset, logic circuit and / or data processing device. The memory 12 or 22 may include read-only memory (ROM) , random access memory (RAM) , flash memory, memory card, storage medium and / or other storage device. The transceiver 13 or 23 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.
[0026] In the early stages of 5G NR, there exists a Dual Connectivity (DC) technology (such as ENDC, where a user equipment simultaneously connects to LTE and NR networks) . The Dual Connectivity requires different base stations to cooperate with each other to exchange control information and user data. In a DC scenario, a primary base station is responsible for signaling control. This means that there is only one NAS connection between the UE and the core network, and from the perspective of the core network, the secondary base station is not perceived. For a user equipment in Dual Connectivity, there is only one NGAP (Next Generation Access Protocol) applied.
[0027] In contrast to Dual Connectivity, for a multi-access technology applied in the present applicant and the term “multi-access” used in this application, multiple access network devices connected to the UE will each have a connection to the core network, and there will have a NGAP connection between the mobility management network element and each of the multiple access network devices for the UE. The control signaling of the multiple access network devices is independent from each other, and the coordination between multiple connections mainly occurs on the network side.
[0028] To deploy multi-access functionality, both UEs and the network shall support this feature. In a large PLMN, the feature support may take some time, that is, in the transition period some network elements in the core network are upgraded to support the feature, while the others are not. For example, some SMFs and part of UPFs do not support the multi-access feature. Another scenario relates to roaming. The roamed network may or may not support the multi-access feature. It may also support the multi-access feature only partially, that is, some SMFs and part of UPFs may not support the feature. Therefore, the UE needs to inform the network whether it supports the feature and the network needs to do the same. This application proposes multi-access feature negotiation between UE and networks, as opposed to the advanced provisioning the same information to the UE and all relevant Network Functions.
[0029] In some embodiments, the processor 11 of the user equipment 10 is configured to send, when attaching to a first radio access network, to the first radio access network a first indication of whether the UE supports multi-access feature, receive from the first radio access network a second indication of whether the first radio access network supports the multi-access feature, send, when attaching to a second radio access network in addition to the first radio access network, to the second radio access network a third indication of whether the UE supports the multi-access feature, receive from the second radio access network a fourth indication of whether the second radio access network supports the multi-access feature, and perform multi-access operation if the UE supports the multi-access feature as indicated by the first indication and the third indication, and the received second indication and fourth indication indicate that both the first radio access network and the second radio access network support the multi-access feature. This can implement multi-access functionality for a user equipment connecting to multiple radio access networks.
[0030] FIG. 3 is a flowchart of a wireless communication method 100 according to an embodiment of the present application. FIG. 4 is a flowchart of an illustrated example of a wireless communication method according to an embodiment of the present application. Referring to FIGs. 3 and 4, the wireless communication method 100 includes the following steps.
[0031] Step 102: when attaching to a first radio access network, sending to the first radio access network a first indication of whether the UE supports multi-access feature;
[0032] In this step, the UE first attaches to a first radio access network such as 4G LTE or 5G NR. When attaching to the first radio access network, the UE sends to the first radio access network a first indication of whether the UE supports multi-access feature (see also Step a of FIG. 4) . The first indication may be carried by a UE network capability information element (IE) or a specific IE of a request message sent to the first radio access network. The request message may be a message requesting to attach to the first radio access network or a message for registration on the first radio access network. For example, the first indication may be carried by a UE network capability IE or a specific UE of an attach request sent to a 4G network; for another example, the first indication may be carried by a UE network capability IE or a specific UE of a registration request sent to a 5G network.
[0033] Step 104: receiving from the first radio access network a second indication of whether the first radio access network supports the multi-access feature;
[0034] In this step, the first radio access network needs to inform the UE whether it supports the multi-access feature, and therefore the UE receives from the first radio access network a second indication of whether the first radio access network supports the multi-access feature (see also Step b of FIG. 4) . The second indication may be carried by a network feature support IE or a specific IE of a response message sent from the first radio access network in response to the request message. For example, the second indication may be carried by a network feature support IE or a specific UE of an attach accept sent from a 4G network; for another example, the second indication may be carried by a network feature support IE or a specific UE of a registration accept sent from a 5G network.
[0035] Step 106: when attaching to a second radio access network in addition to the first radio access network, sending to the second radio access network a third indication of whether the UE supports the multi-access feature; and
[0036] In this step, the UE then attaches to a second radio access network in addition to the first radio access network. In an example, the first radio access network is a 4G network, and the second radio access network is a 5G network. In another example, the first radio access network is a 5G network, and the second radio access network is a 4G network. That is, the UE is a multi-access device capable of simultaneously connecting to the same or different Public Land Mobile Network (PLMN) or Non-Public Networks (NPN) via two different access networks. When connecting to the second radio access network while a connection between the UE and the first radio access network has been established and maintains, the UE sends to the second radio access network a third indication of whether the UE supports the multi-access feature (see also Step c of FIG. 4) . The third indication may be carried by a linked globally unique temporary identity (GUTI) IE or a specific IE of a request message sent to the second radio access network. The request message may be a message requesting to attach to the second radio access network or a message for registration on the second radio access network. For example, the third indication may be carried by a linked GUTI or a specific UE of a registration request sent to a 5G network; for another example, the third indication may be carried by a linked GUTI or a specific UE of an attach request sent to a 4G network.
[0037] Step 108: receiving from the second radio access network a fourth indication of whether the second radio access network supports the multi-access feature.
[0038] In this step, the second radio access network needs to inform the UE whether it supports the multi-access feature, and therefore the UE receives from the second radio access network a fourth indication of whether the second radio access network supports the multi-access feature (see also Step d of FIG. 4) . The fourth indication may be carried by a network feature support IE or a specific IE of a response message sent from the second radio access network in response to the request message. For example, the fourth indication may be carried by a network feature support IE or a specific UE of a registration accept from to a 5G network; for another example, the fourth indication may be carried by a network feature support IE or a specific UE of an attach accept sent from a 4G network.
[0039] Step 110: performing multi-access operation if the UE supports the multi-access feature as indicated by the first indication and the third indication, and the received second indication and fourth indication indicate that both the first radio access network and the second radio access network support the multi-access feature.
[0040] In this step, if the UE supports the multi-access feature as indicated by the first indication and the third indication, the received second indication indicates that the first radio access network supports the multi-access feature, and the received fourth indication indicates that the second radio access network supports the multi-access feature, the UE performs multi-access operation when simultaneously connecting to the first radio access network and the second radio access network. Any of the first radio access network and the second radio access network can be either a Public Land Mobile Network (PLMN) or a Non-Public Networks (NPN) . The UE may not perform multi-access operation if any of the UE, the first radio access network and the second radio access network does not support the multi-access feature.
[0041] In the embodiments of the present application, the UE indicates to the first radio access network with the first indication of whether the UE supports multi-access feature, while the first radio access network indicates to the UE with the second indication of whether the first radio access network supports the multi-access feature. When the UE attaches to the second radio access network in addition to the first radio access network, the UE indicates to the second radio access network with the third indication of whether the UE supports the multi-access feature, while the second radio access network indicates to the UE with the fourth indication of whether the second radio access network supports the multi-access feature. This can implement multi-access functionality for a user equipment connecting to multiple radio access networks. The solution proposes multi-access feature negotiation between UE and networks, as opposed to the advanced provisioning the same information to the UE and all relevant Network Functions.
[0042] In some embodiments, a same internet protocol (IP) address is used by the UE for a first protocol data unit (PDU) session activated after the UE attaches to the first radio access network, newly established first PDU sessions and a second PDU session which is activated later for utilizing the multi-access feature.
[0043] In some embodiments, the method 100 further includes sending to the second radio access network a subscription permanent identifier (SUPI) of a universal subscriber identity module (USIM) that is the same as the SUPI of the USIM sent to the first radio access network, to indicate the multi-access operation is for a single USIM case. In other embodiments, the method 100 further includes sending to the second radio access network a first subscription permanent identifier (SUPI) of a first universal subscriber identity module (USIM) that is different from a second SUPI of a second USIM sent to the first radio access network, to indicate the multi-access operation is for a dual USIM case.
[0044] Below are two example scenarios. In the first one UE attaches to 4GS and later on to 5GS. In the second scenario the reverse takes place.
[0045] Use case 1: Attaching to 4GS and the second time to 5GS
[0046] During the first attach procedure, the UE selects a certain 3GPP access network, that is, the selected RAT is 4G, for example. The UE uses a USIM (e.g. with SUPI-a) and sends the following additional info –an indication that the UE supports multi-access functionality.
[0047] a. UE sends Attach request (referring to clause 8.2.4 in 3GPP TS 24.301) . The UE may use UE network capability IE (referring to clause 9.9.3.34 of the same technical specification) to indicate the multi-access feature support. Alternatively, other IEs may be used, e.g. N1 UE network capability IE (referring to clause 9.9.3.57 of the same technical specification) , or a new IE may be specified.
[0048] b. If the EPC network supports multi-access feature, then the network informs the UE about this with Attach accept (referring to clause 8.2.1 in 3GPP TS 24.301) and includes the multi-access support indication in the EPS network feature support IE (referring to clause 9.9.3.12A of the same technical specification, where currently only two spare bits are left) . It is noted that it is possible no spare bits are left available in the future and in such case, it will become necessary to specify a new IE, e.g. Extended network feature support IE.
[0049] When a PDU session is activated after the first attach (in either case if a single or dual USIM (s) is / are used for the multi-access device) , e.g. PDU-a, the network assigns an IP address to the UE, e.g. IP-a. The UE shall use this IP-afor the newly established PDU-a and also for the other PDU session, e.g., PDU-b, which is activated later on for utilizing the multi-access feature.
[0050] The UE decides it wants to use the multi-access feature. The UE attaches to another 3GPP access network, e.g. 5G, with either the same USIM (SUPI-a) or with another USIM (SUPI-b) . The UE needs to indicate to the network that the multi-access feature can be used anytime. This can be achieved on one of the following ways:
[0051] a. In the case a single USIM is used in the UE (i.e. a single IMEI identifies the USIM slot) , the UE sends the GUTI-aof the SUPI-a, which indicates multi-access operation is requested for a single USIM case.
[0052] b. In the case two USIMs are used in the UE (i.e. each USIM slot is identified by a different IMEI) , the UE sends the GUTI-b of the SUPI-b, which indicates multi-access operation is requested for dual USIM case.
[0053] Below are protocol details for the second attach to 5GS:
[0054] a. UE attaches the second time to 5GS by sending the Registration request. The UE shall send a new IE, the Linked GUTI IE to indicate the multi-access feature will be utilized. It is noted the Information Element Identifier (IEI) of the Linked GUTI IE should be specified by 3GPP CT in the future.
[0055] b. If the 5GC network supports multi-access feature, then the network informs the UE about this with Registration accept (referring to clause 8.2.7 in 3GPP TS 24.501) and includes the multi-access support indication in the 5GS network feature support IE. This also indicates the Linked GUTI is accepted for activating the multi-access feature. Alternatively, a new IE may be specified.
[0056] Use case 2: Attaching to 5GS and the second time to 4GS
[0057] During the first attach procedure, the UE selects 5GS:
[0058] a. UE sends Registration request (referring to clause 8.2.6 in 3GPP TS 24.501) and includes the multi-access support indication in the S1 UE network capability IE (referring to clause 9.11.3.48, which redirects to the definition of the UE network capability IE in clause 9.9.3.34 of 3GPP TS 24.301) . Alternatively, a new IE may be specified, e.g. Extended UE network capability IE.
[0059] b. If the 5GC network supports multi-access feature, the network responds with Registration accept and includes the multi-access support indication in the 5GS network feature support IE. Alternatively, a new IE may be specified.
[0060] UE attaches the second time to 4GS:
[0061] a. UE sends the Attach request. The UE shall send a new IE, the Linked GUTI IE to indicate the multi-access feature will be utilized. The IEI of the Linked GUTI IE should be specified by 3GPP CT in the future.
[0062] b. If the EPC network supports multi-access feature, the network responds with the Attach accept and includes the multi-access support indication in the EPS network feature support IE. This also indicates the Linked GUTI is accepted for activating the multi-access feature. It may become necessary to specify a new IE, e.g. Extended network feature support IE.
[0063] FIG. 5 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present application. Embodiments described herein may be implemented into the system using any suitably configured hardware and / or software. FIG. 5 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory / storage 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, coupled with each other at least as illustrated. The application circuitry 730 may include a circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include any combination of general-purpose processors and dedicated processors, such as graphics processors, application processors. The processors may be coupled with the memory / storage and configured to execute instructions stored in the memory / storage to enable various applications and / or operating systems running on the system.
[0064] The baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include a baseband processor. The baseband circuitry may handle various radio control functions that enables communication with one or more radio networks via the RF circuitry. The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuitry may provide for communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and / or other wireless metropolitan area networks (WMAN) , a wireless local area network (WLAN) , a wireless personal area network (WPAN) . Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.
[0065] In various embodiments, the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency. For example, in some embodiments, baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency. The RF circuitry 710 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network. In various embodiments, the RF circuitry 710 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency. For example, in some embodiments, RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
[0066] In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and / or the application circuitry. As used herein, “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC) , an electronic circuit, a processor (shared, dedicated, or group) , and / or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and / or other suitable hardware components that provide the described functionality. In some embodiments, the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules. In some embodiments, some or all of the constituent components of the baseband circuitry, the application circuitry, and / or the memory / storage may be implemented together on a system on a chip (SOC) . The memory / storage 740 may be used to load and store data and / or instructions, for example, for a system. The memory / storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM) , and / or non-volatile memory, such as flash memory.
[0067] In various embodiments, the I / O interface 780 may include one or more user interfaces designed to enable user interaction with the system and / or peripheral component interfaces designed to enable peripheral component interaction with the system. User interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc. Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface. In various embodiments, the sensor 770 may include one or more sensing devices to determine environmental conditions and / or location information related to the system. In some embodiments, the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit. The positioning unit may also be part of, or interact with, the baseband circuitry and / or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.
[0068] In various embodiments, the display 750 may include a display, such as a liquid crystal display and a touch screen display. In various embodiments, the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, an AR / VR glasses, etc. In various embodiments, a system may have more or less components, and / or different architectures. Where appropriate, methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.
[0069] A person having ordinary skill in the art understands that each of the units, algorithm, and steps described and disclosed in the embodiments of the present application are realized using electronic hardware or combinations of software for computers and electronic hardware. Whether the functions run in hardware or software depends on the condition of application and design requirement for a technical plan. A person having ordinary skill in the art can use different ways to realize the function for each specific application while such realizations should not go beyond the scope of the present application. It is understood by a person having ordinary skill in the art that he / she can refer to the working processes of the system, device, and unit in the above-mentioned embodiment since the working processes of the above-mentioned system, device, and unit are basically the same. For easy description and simplicity, these working processes will not be detailed.
[0070] It is understood that the disclosed system, device, and method in the embodiments of the present application can be realized with other ways. The above-mentioned embodiments are exemplary only. The division of the units is merely based on logical functions while other divisions exist in realization. It is possible that a plurality of units or components are combined or integrated in another system. It is also possible that some characteristics are omitted or skipped. On the other hand, the displayed or discussed mutual coupling, direct coupling, or communicative coupling operate through some ports, devices, or units whether indirectly or communicatively by ways of electrical, mechanical, or other kinds of forms.
[0071] The units as separating components for explanation are or are not physically separated. The units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments. Moreover, each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.
[0072] If the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present application can be essentially or partially realized as the form of a software product. Or, one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product. The software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present application. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM) , a random access memory (RAM) , a floppy disk, or other kinds of media capable of storing program codes.
[0073] While the present application has been described in connection with what is considered the most practical and preferred embodiments, it is understood that the present application is not limited to the disclosed embodiments but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.
Claims
1.A wireless communication method by a user equipment (UE) , comprising:when attaching to a first radio access network, sending to the first radio access network a first indication of whether the UE supports multi-access feature;receiving from the first radio access network a second indication of whether the first radio access network supports the multi-access feature;when attaching to a second radio access network in addition to the first radio access network, sending to the second radio access network a third indication of whether the UE supports the multi-access feature;receiving from the second radio access network a fourth indication of whether the second radio access network supports the multi-access feature; andperforming multi-access operation if the UE supports the multi-access feature as indicated by the first indication and the third indication, and the received second indication and fourth indication indicate that both the first radio access network and the second radio access network support the multi-access feature.2.The method of claim 1, wherein the first radio access network is a 4G network, and the second radio access network is a 5G network.3.The method of claim 1, wherein the first radio access network is a 5G network, and the second radio access network is a 4G network.4.The method of any of claims 1 to 3, wherein the first indication is carried by a UE network capability information element (IE) or a specific IE of a request message sent to the first radio access network.5.The method of claim 4, wherein the second indication is carried by a network feature support IE or a specific IE of a response message sent from the first radio access network in response to the request message.6.The method of any of claims 1 to 3, wherein the third indication is carried by a linked globally unique temporary identity (GUTI) IE or a specific IE of a request message sent to the second radio access network.7.The method of claim 6, wherein the fourth indication is carried by a network feature support IE or a specific IE of a response message sent from the second radio access network in response to the request message.8.The method of any of claims 1 to 7, wherein a same internet protocol (IP) address is used by the UE for a first protocol data unit (PDU) session activated after the UE attaches to the first radio access network, newly established first PDU sessions and a second PDU session which is activated later for utilizing the multi-access feature.9.The method of any of claims 1 to 8, further comprising:sending to the second radio access network a subscription permanent identifier (SUPI) of a universal subscriber identity module (USIM) that is the same as the SUPI of the USIM sent to the first radio access network, to indicate the multi-access operation is for a single USIM case.10.The method of any of claims 1 to 8, further comprising:sending to the second radio access network a first subscription permanent identifier (SUPI) of a first universal subscriber identity module (USIM) that is different from a second SUPI of a second USIM sent to the first radio access network, to indicate the multi-access operation is for a dual USIM case.11.A user equipment (UE) , comprising:at least one memory configured to store program instructions; andat least one processor configured to execute the program instructions, which cause the at least one processor to:when attaching to a first radio access network, send to the first radio access network a first indication of whether the UE supports multi-access feature;receive from the first radio access network a second indication of whether the first radio access network supports the multi-access feature;when attaching to a second radio access network in addition to the first radio access network, send to the second radio access network a third indication of whether the UE supports the multi-access feature;receive from the second radio access network a fourth indication of whether the second radio access network supports the multi-access feature; andperform multi-access operation if the UE supports the multi-access feature as indicated by the first indication and the third indication, and the received second indication and fourth indication indicate that both the first radio access network and the second radio access network support the multi-access feature.12.The UE of claim 11, wherein the first radio access network is a 4G network, and the second radio access network is a 5G network.13.The UE of claim 11, wherein the first radio access network is a 5G network, and the second radio access network is a 4G network.14.The UE of any of claims 11 to 13, wherein the first indication is carried by a UE network capability information element (IE) or a specific IE of a request message sent to the first radio access network.15.The UE of claim 14, wherein the second indication is carried by a network feature support IE or a specific IE of a response message sent from the first radio access network in response to the request message.16.The UE of any of claims 11 to 13, wherein the third indication is carried by a linked globally unique temporary identity (GUTI) IE or a specific IE of a request message sent to the second radio access network.17.The UE of claim 16, wherein the fourth indication is carried by a network feature support IE or a specific IE of a response message sent from the second radio access network in response to the request message.18.The UE of any of claims 11 to 17, wherein a same internet protocol (IP) address is used by the UE for a first protocol data unit (PDU) session activated after the UE attaches to the first radio access network, newly established first PDU sessions and a second PDU session which is activated later for utilizing the multi-access feature.19.The UE of any of claims 11 to 18, wherein the program instructions further cause the at least one processor to:send to the second radio access network a subscription permanent identifier (SUPI) of a universal subscriber identity module (USIM) that is the same as the SUPI of the USIM sent to the first radio access network, to indicate the multi-access operation is for a single USIM case.20.The UE of any of claims 11 to 18, wherein the program instructions further cause the at least one processor to:send to the second radio access network a first subscription permanent identifier (SUPI) of a first universal subscriber identity module (USIM) that is different from a second SUPI of a second USIM sent to the first radio access network, to indicate the multi-access operation is for a dual USIM case.21.A non-transitory machine-readable storage medium having stored thereon instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 10.22.A chip, comprising:a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any one of claims 1 to 10.23.A computer readable storage medium, in which a computer program is stored, wherein the computer program causes a computer to execute the method of any one of claims 1 to 10.24.A computer program product, comprising a computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 10.25.A computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 10.