CN116546571A - Method, system and storage medium for switching core network of N5CW device - Google Patents

Method, system and storage medium for switching core network of N5CW device Download PDF

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Publication number
CN116546571A
CN116546571A CN202310494696.7A CN202310494696A CN116546571A CN 116546571 A CN116546571 A CN 116546571A CN 202310494696 A CN202310494696 A CN 202310494696A CN 116546571 A CN116546571 A CN 116546571A
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China
Prior art keywords
twif
n5cw
source
amf
target
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CN202310494696.7A
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Chinese (zh)
Inventor
谢婉怡
吴云普
莫旺涛
陆丽芳
王真
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Guangzhou Aipu Road Network Technology Co Ltd
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Guangzhou Aipu Road Network Technology Co Ltd
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Priority to CN202310494696.7A priority Critical patent/CN116546571A/en
Publication of CN116546571A publication Critical patent/CN116546571A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method, a system and a storage medium for switching a core network by N5CW equipment, which can be widely applied to the technical field of 5G core networks. According to the method and the device, the non-3GPP reference point of the TNAN is interacted with the N5CW device, the TNAN is interacted with the AMF and the UPF respectively, in the switching process, when the information of connection is weakened according to the position information of the N5CW device, after the target AMF and the target TWIF which can serve the current N5CW device exchange and interaction, context interaction response information is sent to the source AMF, and further the switching of the source TWIF and the target TWIF is carried out, so that the switching process of the current N5CW device and the core network can be realized without manual setting.

Description

Method, system and storage medium for switching core network of N5CW device
Technical Field
The invention relates to the technical field of 5G core networks, in particular to a method, a system and a storage medium for switching a core network by N5CW equipment.
Background
In the related art, in order to solve the problem of insufficient uplink bandwidth of 5G NR, wiFi equipment without 5G access capability (N5 CW) is introduced to solve the uplink bandwidth requirement of the user. For the access of the N5CW device, the current common mode is a core network switching mode for realizing 3GPP access through R-AN or a core network switching mode for realizing non-3GPP access through N3IWF, or in non-3GPP, TWAP and TWIF are in one-to-one mode, and after leaving TWAP, the user needs to manually switch TWAP and then re-access the 5G core network.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a method, a system and a storage medium for switching the core network of the N5CW device, which can realize the automatic switching function of the N5CW device.
In one aspect, an embodiment of the present invention provides a method for switching a core network by using an N5CW device, where the N5CW device interacts with a TNAN through a non-3GPP reference point, and the TNAN interacts with an AMF and a UPF respectively; the TNAN comprises TWAP and TWIF, and the TWIF comprises source TWIF and target TWIF; the AMF comprises a source AMF and a target AMF; the method comprises the following steps:
acquiring the position information of N5CW equipment;
determining that a signal connected with the N5CW device is weakened according to the position information, and acquiring a target AMF capable of serving the N5CW device;
after exchanging interaction between the target AMF and the target TWIF, sending context interaction response information to the source AMF;
the source AMF informs the source TWIF that the preparation for switching is completed;
the source TWIF forwards the information of the N5CW device to the target TWIF;
when the N5CW device is successfully handed over, the source AMF releases the resources related to the N5CW device from the source TWIF and the source TWIF releases radio side resources.
In some embodiments, the determining that the signal connected to the N5CW apparatus is weak according to the location information and acquiring the target AMF that can serve the N5CW apparatus includes:
the source TWIF determines that a signal connected with the N5CW device is weakened according to the position information, and sends first switching request information to the source AMF, wherein the first switching request information comprises a device identifier of the source TWIF and an IP address of the source TWIF;
when the source AMF is no longer serving the N5CW device, the source AMF determines an AMF that can serve the N5CW device as a target AMF.
In some embodiments, after the target AMF exchanges interactions with the target TWIF, sending context interaction response information to the source AMF includes:
the source AMF sends context interaction request information to the target AMF, wherein the context interaction request information comprises N2 context information of the N5CW device;
after the target AMF interacts with the SMF, the target AMF sends second switching request information to the target TWIF, wherein the second switching request information is used for requesting to establish wireless side network resources;
the target TWIF returns a switching request confirmation message to the target AMF according to the second switching request message, wherein the switching request confirmation message comprises an SM message of N2, an N3 address and tunnel information;
and the target AMF sends context interaction response information to the source AMF according to the switching request confirmation information.
In some embodiments, the source AMF informs the source twin that the handover preparation is complete, including:
the source AMF sends a handover command to the source TWIF, wherein the handover command comprises an SM message and N3 address and tunnel information of N2 of the target TWIF, and an IP address and equipment identifier of the target TWIF;
and after receiving the switching preparation completion message, the source TWIF forwards the switching preparation completion message to the N5CW device.
In some embodiments, the source TWIF forwards information of the N5CW device to the target TWIF, including:
and the source TWIF forwards the information of the N5CW device to the target TWIF according to the N3 address and the tunnel information.
In some embodiments, after the source TWIF forwards the information of the N5CW device to the target TWIF, the method further includes the steps of:
after the N5CW device receives the handover preparation completion message, the N5CW device obtains the IP address and the device identifier of the target TWIF and sends a handover confirmation message to the target TWIF according to the IP address and the device identifier of the target TWIF.
In some embodiments, the source AMF releasing the source TWIF resources for the N5CW device includes:
the target TWIF sends switching notification information to the target AMF, wherein the switching notification information is used for notifying that the target AMF is successfully switched;
and the target AMF sends resource release notification information to the source AMF according to the switching notification information, wherein the resource release notification information is used for notifying the source AMF to release the resources of the source TWIF related to the N5CW device.
In some embodiments, the source TWIF releases radio side resources, including:
after the source AMF replies a resource release confirmation message to the target AMF, a UE release command is sent to the source TWIF, and the UE release command is used for indicating the source TWIF to release wireless side resources;
the source TWIF replies a resource release complete message to the source AMF.
In another aspect, an embodiment of the present invention provides a system for switching a core network by using an N5CW device, including:
at least one memory for storing a program;
at least one processor configured to load the program to perform the method of switching the core network by the N5CW device.
In another aspect, an embodiment of the present invention provides a computer storage medium, in which a computer executable program is stored, where the computer executable program is used to implement the method for switching a core network by using the N5CW device when the computer executable program is executed by a processor.
The method for switching the core network by the N5CW device provided by the embodiment of the invention has the following beneficial effects:
in the embodiment, the non-3GPP reference point of the TNAN is interacted with the N5CW device, and the TNAN is interacted with the AMF and the UPF respectively, and when the information of connection is weakened according to the position information of the N5CW device in the switching process, after the target AMF capable of serving the current N5CW device exchanges and interacts with the target TWIF, the context interaction response information is sent to the source AMF, so that the switching process of the source TWIF and the target TWIF is further carried out, and therefore, the switching process of the current N5CW device and the core network can be realized without manual setting.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a diagram of a 5GS architecture according to an embodiment of the present invention;
FIG. 2 is a diagram of another 5GS architecture according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for switching core networks by using an N5CW device according to an embodiment of the present invention;
fig. 4 is an application schematic diagram of a method for switching a core network by using an N5CW device according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Before proceeding with the description of specific embodiments, the terms involved in the embodiments of the present application are explained as follows:
5GC: the 5G core network is the core of the 5G mobile network. It establishes a reliable, secure network connection for the end user and provides access to its services. The core domain handles various basic functions in the mobile network, such as connectivity and mobility management, authentication and authorization, user data management and policy management, etc. The 5G core network functions are completely software-based and designed as cloud native, meaning that they are independent of the underlying cloud infrastructure, enabling higher deployment agility and flexibility.
AMF: english is called Access and Mobility Management Function, chinese is interpreted as access and mobility management function network elements, and the functions include connection management, reachability management, mobility management, access authorization and the like.
T-AMF: target AMF, chinese is interpreted as a destination mobility and mobility management function.
S-AMF: source AMF, chinese is interpreted as a Source mobility and mobility management function.
SMF: english is fully named Session Management Function and chinese is interpreted as a session management function network element whose functions include session management, such as session establishment, modification and release, etc., including maintenance of channels between UPF and AN nodes, etc.
UPF: english is fully called User plane Function, chinese is interpreted as a user plane functional network element whose functions include session points where external PDUs are interconnected with the data network, packet routing and forwarding, e.g. supporting an uplink classifier to route traffic to an instance of the data network.
TWAP: trusted non-3gpp access points.
T-TNAN: english is known as Trusted Non-3GPP Access Network and Chinese is interpreted as Trusted Non-3GPP access networks.
N5CW: english is fully called Non-5G-Capable over WLAN, chinese is interpreted as a device that does not support access to 5GC NAS signaling over WLAN.
Yt: non-3gpp reference point.
Yw: non-3gpp reference point.
T-TWIF: target TWIF, a trusted WLAN interworking function.
S-TWIF: source TWIF, source trusted WLAN interworking function.
N1: the N1 interface is a signaling interface between the terminal and the AMF.
N2: the N2 interface is a signaling plane interface between the (R) AN and the AMF.
And N3: the N3 interface is a user plane interface between the (R) AN and the UPF.
WLAN: english is known as Wireless Local Area Network and Chinese is interpreted as WLAN.
MCC: english is known in full as Mobile country code and Chinese is interpreted as a mobile country code.
MNC: english is called Mobile network code and Chinese is interpreted as mobile network code.
In order to solve the problem of insufficient uplink bandwidth of 5G NR, wiFi equipment without 5G access capability (N5 CW) is introduced to solve the uplink bandwidth requirement of users. The current networking scenario is that a plurality of TWAPs are connected with one TWAF, a 5G core network is connected through one TWAF, and the current protocol and specification do not define that when a user moves to a new TWIF range and the signal is stronger than the TWAP signal on the original connection, the user automatically switches to the new TWAP and TWIF. Therefore, how to support the TNAN to switch to a different 5G core network according to the strength of the connection signal with the user becomes a problem to be solved.
Referring to fig. 1, a 5GS architecture diagram is provided in an embodiment of the present application. From this architecture diagram, it can be seen that the N5CW facility interacts with the TNAN through the non-3GPP reference point Yt. Wherein TNAN comprises TWAP and TWIF. TWAP interfaces with TWIF through non-3GPP reference point Yw, TWIF interacts with AMF through N1 and N2, TWIF interacts with UPF through N3. When the TNAN includes a plurality of TWAPs and a plurality of TWIF, as shown in FIG. 2, the TNAN includes TWAP1, TWAP2, TWIF1 and TWIF2, wherein the N5CW device is connected to TWAP1 and TWAP2 through a non-3GPP reference point Yt, respectively, TWAP1 is connected to TWIF1 through Yw, TWAP2 is also connected to TWIF2 through Yw, including but not limited to AMF and UPF in 5GC, each of TWIF1 and TWIF2 interacts with 5GC through N1, N2 and N3. In this embodiment, the N5CW device in this embodiment uses the TNAN as a device on the access side to interact with the AMF through the Yt interface, so as to implement message interaction between the N1 and N2 interfaces; and interacting with UPF to realize message interaction of N3 interface. In the case that the N5CW device is successfully online and in a connected state through the tif, because the N5CW device moves from the source tif to the target tif node, in order to ensure that the N5CW device can normally use the network, the tif will send a weak notification of the user signal to the tif, and the tif initiates a handover procedure to the 5G core network. And finally, the S-TWIF is transferred to the T-TWIF according to the switching information sent by the WLAN. Specifically, the embodiment brings the ID and the device type of the tif 1 to the tif 1 when the tif 1 sends the user message to the tif 2, so as to distinguish the TWAP from the tif message.
Specifically, referring to fig. 3, an embodiment of the present invention provides a method for switching a core network by using an N5CW device. In this embodiment, the TWIF includes a source TWIF and a target TWIF; the AMF includes a source AMF and a target AMF. In execution, the method of the embodiment includes, but is not limited to, the following steps:
step S110, acquiring the position information of the N5CW device;
step S120, determining that a signal connected with the N5CW device is weakened according to the position information, and acquiring a target AMF capable of serving the N5CW device;
in this embodiment, when the source TWIF determines, according to the location information, that the signal connected to the N5CW device is weakened, first handover request information may be sent to the source AMF, where the first handover request information includes a device identifier of the source TWIF and an IP address of the source TWIF; when the source AMF no longer serves the N5CW devices, the source AMF determines an AMF that can serve the N5CW devices as the target AMF.
Step S130, after exchanging interaction between the target AMF and the target TWIF, sending context interaction response information to the source AMF;
in this embodiment, the source AMF sends context interaction request information carrying N2 context information of the N5CW device to the target AMF; after the target AMF interacts with the SMF, the target AMF sends second switching request information to the target TWIF to request to establish wireless side network resources; the target TWIF returns a switching request confirmation message comprising an SM message of N2 and an N3 address and tunnel information to the target AMF according to the second switching request message; and the target AMF sends context interaction response information to the source AMF according to the switching request confirmation information.
Step S140, the source AMF informs the source TWIF that the preparation for switching is completed;
in this embodiment, the source AMF sends a handover command to the source TWIF, where the handover command includes an SM message and N3 address and tunnel information of N2 of the target TWIF, and an IP address and device identifier of the target TWIF; after receiving the handover preparation complete message, the source TWIF forwards the handover preparation complete message to the N5CW device.
Step S150, the source TWIF forwards the information of the N5CW device to the target TWIF; specifically, the source TWIF forwards the information of the N5CW device to the target TWIF according to the N3 address and the tunnel information. And then, after the N5CW device receives the switching preparation completion message, the N5CW device acquires the IP address and the device identifier of the target TWIF and sends switching confirmation information to the target TWIF according to the IP address and the device identifier of the target TWIF.
Step S160, when the N5CW device is successfully switched, the source AMF releases the resources of the source TWIF related to the N5CW device and the source TWIF releases the wireless side resources.
In this embodiment, when the source TWIF related to the N5CW device is released, the handover notification information may be sent to the target AMF through the target TWIF to notify that the target AMF handover is successful; the target AMF transmits resource release notification information to the source AMF according to the handover notification information to notify the source AMF to release the source TWIF related resources of the N5CW device.
When the source TWIF releases the wireless side resource, after the source AMF replies a resource release confirmation message to the target AMF, a UE release command is sent to the source TWIF to instruct the source TWIF to release the wireless side resource; the source TWIF replies to the source AMF with a resource release complete message.
Illustratively, taking the interaction scenario shown in fig. 4 as an example, the application procedure of the embodiment of the present application includes, but is not limited to, the following steps:
step one, the S-TWIF judges that the current connection signal with the N5CW device is weakened according to the position information of the N5CW device, and sends a Handover Request message (first Handover Request message) to the S-AMF to inform the S-AMF that the device needs to be handed over. The first switching request information carries an equipment identifier of the S-TWIF and an IP address of the S-TWIF.
And step two, if the S-AMF can not continue to serve the N5CW device, the S-AMF selects a serviceable T-AMF. The S-AMF sends a Namf_communication_ CreatEUEContext request message (context interaction request information) to the T-AMF, and initiates a switching resource allocation flow. The context interaction request information carries N2 context information of the N5CW device.
And thirdly, after the T-AMF interacts with the SMF, the T-AMF sends a Handover Request message (second Handover Request message) to the T-TWIF to Request to establish network resources of the wireless side.
And step four, after receiving the Handover Request message (second Handover Request information), the T-TWIF returns a Handover Request Acknowledge message (Handover Request confirm information) to the T-AMF, wherein the Handover Request confirm information carries the SM message of N2, the N3 address and the tunnel information.
And fifthly, after receiving the switching request response message sent by the T-TWIF, the T-AMF sends a Namf_communication_ CreateUEContext Response response message (context interaction response message) to the S-AMF.
And step six, after the S-AMF receives the response message, sending a Handover Command message to the S-TWIF to inform the S-TWIF that the Handover preparation is completed. And carries the N2 SM message and N3 address of the T-TWIF with the tunnel information, the IP address of the T-TWIF and the device identification.
And step seven, after receiving the message of completing the switching preparation, the S-TWIF forwards the message to the N5CW device.
And step eight, the S-TWIF transmits the information of the N5CW device stored in the S-TWIF to the T-TWIF according to the N3 address and the tunnel information obtained from the S-AMF notification handover completion message.
And step nine, after the N5CW equipment receives the message of completing the switching preparation, the IP address and the equipment identifier of the T-TWIF are obtained, and a Handover Confirm message (switching Confirm information) is sent to the T-TWIF through the IP address and the equipment identifier.
And step ten, after the T-TWIF receives the success of the N5CW switching, the T-TWIF transmits a Handover Notify message (switching notification information) to the T-AMF to Notify the T-AMF of the success of the switching.
Step eleven, after receiving the handover success message, the T-AMF sends a namf_communication_n2 infofotify message (resource release notification message) to the S-AMF, notifying the S-AMF to release the resources of the S-TWIF related to the N5CW device.
Step twelve, the S-AMF replies Namf_communication_N2InfoNotif_Ack message (resource release confirmation message) to the T-AMF.
Step thirteen, the S-AMF sends UE Context Release Command a message (UE release order) informing the S-TWIF to release the radio side resources.
Step fourteen, S-TWIF replies UE Context Release Complete message (resource release complete message) to S-AMF.
It can be seen that in this embodiment, a plurality of TNANs are mainly provided in the WLAN, and the N5CW devices can be connected to the TNAN through the Yt interface, but the network signal strength between the TNANs is not constant, the N5CW devices need to be switched to a suitable stable 5G core network, and the TWIF can communicate with each other according to the IP address and the device identifier to switch the context and configuration of the N5CW devices to the T-TWIF, so as to implement the switching under the WLAN. After the embodiment of the application is used, the AMF finds the NAS codec of the opening account of the UDM through the IMEI of the terminal, and the NAS codec is directly used, so that a set of core network can dynamically support a plurality of customized NAS protocols, various terminal online and service processing in various different scenes are supported, and the compatibility of the core network to terminal diversification is improved.
In addition, the embodiment can also notify the 5G core network in other characteristic modes; or other characteristic modes are used, the SSID of the TWIF and the TWAP are set to be consistent, and the user is switched to the new TWIF under the condition of notifying the 5G core network, so that different TWIF is selected according to the strength of a signal connected with the user, and the user is accessed to the 5G core network.
The embodiment of the invention provides a system for switching a core network by N5CW equipment, which comprises:
at least one memory for storing a program;
at least one processor for loading the program to perform the method of switching the core network for the N5CW device shown in fig. 3.
The content of the method embodiment of the invention is suitable for the system embodiment, the specific function of the system embodiment is the same as that of the method embodiment, and the achieved beneficial effects are the same as those of the method.
The embodiment of the invention provides a computer storage medium in which a computer executable program is stored, which when executed by a processor is used to implement the method for switching the core network of the N5CW device shown in fig. 3.
The content of the method embodiment of the invention is applicable to the storage medium embodiment, the specific function of the storage medium embodiment is the same as that of the method embodiment, and the achieved beneficial effects are the same as those of the method.
Furthermore, embodiments of the present invention provide a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device may read the computer instructions from the computer-readable storage medium, and execute the computer instructions to cause the computer device to perform the method of switching the core network for the N5CW device shown in fig. 3.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A method for an N5CW device to switch core networks, wherein the N5CW device interacts with a TNAN through a non-3GPP reference point, the TNAN interacting with an AMF and a UPF, respectively; the TNAN comprises TWAP and TWIF, and the TWIF comprises source TWIF and target TWIF; the AMF comprises a source AMF and a target AMF; the method comprises the following steps:
acquiring the position information of N5CW equipment;
determining that a signal connected with the N5CW device is weakened according to the position information, and acquiring a target AMF capable of serving the N5CW device;
after exchanging interaction between the target AMF and the target TWIF, sending context interaction response information to the source AMF;
the source AMF informs the source TWIF that the preparation for switching is completed;
the source TWIF forwards the information of the N5CW device to the target TWIF;
when the N5CW device is successfully handed over, the source AMF releases the resources related to the N5CW device from the source TWIF and the source TWIF releases radio side resources.
2. The method for switching a core network of an N5CW device according to claim 1, wherein determining that a signal connected to the N5CW device is weakened according to the location information and acquiring a target AMF that can serve the N5CW device includes:
the source TWIF determines that a signal connected with the N5CW device is weakened according to the position information, and sends first switching request information to the source AMF, wherein the first switching request information comprises a device identifier of the source TWIF and an IP address of the source TWIF;
when the source AMF is no longer serving the N5CW device, the source AMF determines an AMF that can serve the N5CW device as a target AMF.
3. The method for switching a core network of an N5CW device according to claim 1, wherein after the target AMF exchanges with the target TWIF, sending context exchange response information to the source AMF includes:
the source AMF sends context interaction request information to the target AMF, wherein the context interaction request information comprises N2 context information of the N5CW device;
after the target AMF interacts with the SMF, the target AMF sends second switching request information to the target TWIF, wherein the second switching request information is used for requesting to establish wireless side network resources;
the target TWIF returns a switching request confirmation message to the target AMF according to the second switching request message, wherein the switching request confirmation message comprises an SM message of N2, an N3 address and tunnel information;
and the target AMF sends context interaction response information to the source AMF according to the switching request confirmation information.
4. The method for switching a core network of an N5CW device according to claim 1, wherein the source AMF notifies a source TWIF of completion of a handover preparation, including:
the source AMF sends a handover command to the source TWIF, wherein the handover command comprises an SM message and N3 address and tunnel information of N2 of the target TWIF, and an IP address and equipment identifier of the target TWIF;
and after receiving the switching preparation completion message, the source TWIF forwards the switching preparation completion message to the N5CW device.
5. The method for switching a core network for an N5CW device according to claim 4, wherein the forwarding of information of the N5CW device by the source TWIF to the target TWIF includes:
and the source TWIF forwards the information of the N5CW device to the target TWIF according to the N3 address and the tunnel information.
6. The method for switching a core network for an N5CW device according to claim 5, wherein after the source TWIF forwards information for the N5CW device to a target TWIF, the method further includes the steps of:
after the N5CW device receives the handover preparation completion message, the N5CW device obtains the IP address and the device identifier of the target TWIF and sends a handover confirmation message to the target TWIF according to the IP address and the device identifier of the target TWIF.
7. The method for switching a core network of an N5CW device according to claim 1, wherein the source AMF releases the source TWIF related resources of the N5CW device, including:
the target TWIF sends switching notification information to the target AMF, wherein the switching notification information is used for notifying that the target AMF is successfully switched;
and the target AMF sends resource release notification information to the source AMF according to the switching notification information, wherein the resource release notification information is used for notifying the source AMF to release the resources of the source TWIF related to the N5CW device.
8. The method for switching a core network of an N5CW device according to claim 1, wherein the source TWIF releases radio side resources, including:
after the source AMF replies a resource release confirmation message to the target AMF, a UE release command is sent to the source TWIF, and the UE release command is used for indicating the source TWIF to release wireless side resources;
the source TWIF replies a resource release complete message to the source AMF.
9. A system for switching a core network for an N5CW device, comprising:
at least one memory for storing a program;
at least one processor configured to load the program to perform the method of switching a core network for an N5CW device according to any of claims 1 to 8.
10. A computer storage medium having stored therein a computer executable program for implementing the method of switching a core network for an N5CW device according to any of claims 1 to 8 when executed by a processor.
CN202310494696.7A 2023-05-04 2023-05-04 Method, system and storage medium for switching core network of N5CW device Pending CN116546571A (en)

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