CN114095984B - Session management method, OAM and AMF - Google Patents

Session management method, OAM and AMF Download PDF

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Publication number
CN114095984B
CN114095984B CN202111288696.9A CN202111288696A CN114095984B CN 114095984 B CN114095984 B CN 114095984B CN 202111288696 A CN202111288696 A CN 202111288696A CN 114095984 B CN114095984 B CN 114095984B
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amf
user equipment
session
oam
network
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CN114095984A (en
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张伦泳
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Abstract

The invention discloses a session management method, which comprises the following steps: responding to a session management request sent by a first access and mobile management function entity AMF, and carrying out network resource allocation for user equipment according to the session slice information carried in the session management request; the session management request is sent by the first AMF when the connected user equipment is detected to be switched to the second AMF and the user equipment has an unfinished session, and the public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located; and instructing the second AMF to send the context parameters of the user equipment to the third AMF, and instructing the third AMF to maintain the session of the user equipment for the third AMF to maintain the session of the user equipment according to the network resource configuration and the context parameters. The method and the device can ensure that the ongoing session of the user equipment is not forced to be interrupted when the user equipment leaves the PNI-NPN wireless network coverage area and enters the wireless network coverage area of the PLMN bearing the PNI-NPN, thereby improving the user experience. The invention also discloses OAM and AMF.

Description

Session management method, OAM and AMF
Technical Field
The invention relates to the technical field of communication, in particular to a session management method, an OAM, a third AMF and a first AMF.
Background
An NPN (Non-public networks) is defined in a 5G (5 th Generation Mobile Communication Technology, fifth generation mobile communication technology) network. NPN is used for private entities (e.g., enterprises) that can be deployed using virtual and physical devices. The NPN may be hosted by or provided as part of a PLMN (Public Land Mobile Network ). The NPN hosted by or provided as part of the PLMN is referred to as a PNI-NPN (Public Network Integrated NPN, public network based NPN) which may be implemented by partitioning individual network resources for the NPN on the PLMN in a sliced manner, in which case an ongoing session connection on the UE (User Equipment) may be interrupted after leaving the coverage area of the PNI-NPN network for a User on the PNI-NPN network.
Thus, a method is needed to solve the above-mentioned drawbacks.
Disclosure of Invention
Therefore, the present invention provides a session management method, an OAM, a third AMF and a first AMF to solve the above-mentioned drawbacks of the prior art.
To achieve the above object, a first aspect of the present invention provides a session management method, the method including:
responding to a session management request sent by a first access and mobile management function entity AMF, and carrying out network resource allocation for user equipment according to the session slice information carried in the session management request; the session management request is sent by the first AMF when the connected user equipment is detected to be switched to a second AMF and the user equipment has an unfinished session, and a public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located;
and instructing the second AMF to send a context parameter of the user equipment to a third AMF, and instructing the third AMF to maintain the session of the user equipment, so that the third AMF maintains the session of the user equipment according to the network resource configuration and the context parameter.
Optionally, the network resource configuration includes dividing radio network resources and allocating core network resources, and after the instructing the second AMF to send context parameters of the user equipment to a third AMF and instructing the third AMF to maintain the session of the user equipment, the method further includes:
in response to the session ending, the partitioning of wireless network resources and the allocating of core network resources are cancelled.
Optionally, the session slice information at least includes a single network slice selection auxiliary information S-nsai parameter corresponding to the session, and the configuring network resources for the user equipment according to the session slice information carried in the session management request includes:
determining the wireless network resource requirement and the core network resource of the session according to the S-NSSAI parameters corresponding to the session;
and allocating the core network resource for the user equipment, and marking the wireless network resource meeting the wireless network resource requirement in the PLMN as the wireless network resource available by the PNI-NPN.
In yet another aspect, the present invention provides a session management method, the method including:
responding to the context parameters of the user equipment sent by the second access and mobile management function entity AMF and the instruction of maintaining the session of the user equipment sent by the operation management and maintenance function entity OAM, and maintaining the session of the user equipment according to the network resource configuration made by the OAM and the context parameters; the instruction for maintaining the session of the ue is sent by the OAM after receiving a session management request sent by a first AMF, where a public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located.
Optionally, the network resource configuration includes dividing a wireless network resource, and the maintaining the session of the user equipment according to the network resource configuration made by the OAM and the context parameter includes:
allocating wireless network resources for the user equipment according to the OAM divided wireless network resources and the context parameters so as to enable the user equipment to carry out session through the allocated wireless network resources;
forwarding non-access stratum (NAS) signaling sent by the user equipment to the first AMF, and forwarding NAS signaling sent by the first AMF to the user equipment.
Optionally, after the session of the user equipment is maintained according to the network resource configuration and the context parameters by the OAM, the method further includes:
and in response to the session ending, disconnecting the connection between the user equipment and the PNI-NPN.
In yet another aspect, the present invention provides a session management method, the method including:
in response to detecting that a user equipment connected with a current access and mobility management function entity (AMF) is switched to a second AMF and the user equipment has an unfinished session, sending a session management request to an operation management and maintenance function entity (OAM) so that the OAM can perform network resource configuration for the user equipment according to session slice information carried in the session management request, instructing the second AMF to send context parameters of the user equipment to a third AMF and instructing the third AMF to maintain the session of the user equipment; the public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located.
In yet another aspect, the present invention provides an operation administration and maintenance function entity OAM, including:
the receiving module is used for receiving a session management request sent by the first access and mobile management function entity AMF;
the configuration module is used for responding to the session management request sent by the first AMF and carrying out network resource configuration for the user equipment according to the session slice information carried in the session management request; the session management request is sent by the first AMF when the connected user equipment is detected to be switched to a second AMF and the user equipment has an unfinished session, and a public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located;
an indication module, configured to instruct the second AMF to send a context parameter of the user equipment to a third AMF, and instruct the third AMF to maintain the session of the user equipment, so that the third AMF maintains the session of the user equipment according to the network resource configuration and the context parameter.
In yet another aspect, the present invention provides a third access and mobility management function entity AMF, comprising:
a receiving module, configured to receive a context parameter of a user equipment sent by a second access and mobility management function entity AMF and an indication of maintaining a session of the user equipment sent by an operation management and maintenance function entity OAM;
a processing module, configured to respond to a context parameter of a user equipment sent by a second AMF and an instruction for maintaining a session of the user equipment sent by an operation management and maintenance function entity OAM, and maintain the session of the user equipment according to a network resource configuration made by the OAM and the context parameter; the instruction for maintaining the session of the ue is sent by the OAM after receiving a session management request sent by a first AMF, where a public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located.
In yet another aspect, the present invention provides a first access and mobility management function entity AMF, comprising:
the detection module is used for detecting whether the user equipment connected with the current AMF is switched to the second AMF and whether the user equipment has an unfinished session;
a sending module, configured to send a session management request to an operation management and maintenance function entity OAM in response to detecting that a user equipment connected to a current AMF is switched to a second AMF and the user equipment has an unfinished session, so that the OAM performs network resource configuration for the user equipment according to session slice information carried in the session management request, instructs the second AMF to send a context parameter of the user equipment to a third AMF, and instructs the third AMF to maintain the session of the user equipment; the public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located.
The invention has the following advantages:
according to the session management method provided by the invention, when the first AMF detects that the connected user equipment is switched to the second AMF and the user equipment has an unfinished session, the first AMF sends a session management request to the OAM, the OAM carries out network resource configuration for the user equipment according to the session slice information carried in the session management request, instructs the second AMF to send the context parameters of the user equipment to the third AMF, and instructs the third AMF to keep the session of the user equipment so that the third AMF can keep the session of the user equipment according to the network resource configuration and the context parameters. When the user equipment leaves the PNI-NPN wireless network coverage area and enters the wireless network coverage area of the PLMN bearing the PNI-NPN, the third AMF can keep the session which is not finished by the user equipment according to the network resource configuration made by the OAM and the context parameters of the user equipment forwarded by the second AMF, so that the ongoing session of the user equipment cannot be forced to be interrupted, and the user experience is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention.
Fig. 1 is a schematic diagram of a session management system according to an embodiment of the present invention;
fig. 2 is a flow chart of an OAM side session management method according to an embodiment of the present invention;
fig. 3 is a flow chart of a third AMF side session management method according to an embodiment of the invention;
fig. 4 is a flow chart of a first AMF side session management method according to an embodiment of the invention;
fig. 5 is a schematic diagram of an OAM module according to an embodiment of the present invention;
FIG. 6 is a schematic block diagram of a third AMF according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of a first AMF according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of better understanding of the technical solution of the present invention to those skilled in the art.
It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention, and are not limiting of the invention.
It is to be understood that the various embodiments of the invention and the features of the embodiments may be combined with each other without conflict.
It is to be understood that only the portions relevant to the present invention are shown in the drawings for convenience of description, and the portions irrelevant to the present invention are not shown in the drawings.
It should be understood that each unit and module in the embodiments of the present invention may correspond to only one physical structure, may be formed by a plurality of physical structures, or may be integrated into one physical structure.
It will be appreciated that, without conflict, the functions and steps noted in the flowcharts and block diagrams of the present invention may occur out of the order noted in the figures.
It is to be understood that the flowcharts and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatuses, devices, methods according to various embodiments of the present invention. Where each block in the flowchart or block diagrams may represent a unit, module, segment, code, or the like, which comprises executable instructions for implementing the specified functions. Moreover, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by hardware-based systems that perform the specified functions, or by combinations of hardware and computer instructions.
It should be understood that the units and modules related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.
The session management method provided by the embodiment of the invention, as shown in fig. 1, may be applied to a session management system including an AMF (Access and Mobility Management Function, access and mobility management function entity) in PNI-NPN, PLMN, PNI-NPN, an AMF in PLMN, an OAM (Operation Administration and Maintenance, operation management and maintenance function entity) in PLMN, UE (User Equipment), and the like, where the PLMN carries PNI-NPN, and the PNI-NPN is an NPN network constructed based on network fragmentation on the PLMN. In the figure, the solid ellipse represents the range of the core network, the dotted ellipse represents the coverage of the wireless network, and the AMF 1 (i.e., first AMF), AMF 3 (i.e., the third AMF) represents the AMF in PNI-NPN 2 (i.e., the second AMF) represents AMF, OA in PLMNM is responsible for completing parameter management and configuration of the PLMN, and the UE (i.e. user equipment) may be in the wireless network coverage of the PNI-NPN and/or PLMN.
As shown in fig. 2, an embodiment of the present invention provides a session management method, when applied to OAM, the method may include the following steps:
in step S11, in response to the session management request sent by the first AMF, network resource allocation is performed for the user equipment according to the session slice information carried in the session management request.
The session management request is sent by the first AMF when detecting that the connected ue is switched to the second AMF and the ue has an unfinished session, and the PLMN where the first AMF is located carries the PNI-NPN where the second AMF is located.
In step S12, the second AMF is instructed to send context parameters of the user equipment to the third AMF, and the third AMF is instructed to maintain the session of the user equipment, for the third AMF to maintain the session of the user equipment according to the network resource configuration and the context parameters.
The third AMF may be an existing AMF in the PLMN, or an AMF temporarily created in the PLMN by the OAM.
Initially, the UE is connected to the PNI-NPN, is in wireless network coverage of the PNI-NPN, and is AMF 1 And (5) connection. When AMF 1 Detecting a handover of a UE to AMF 2 And when the UE has an unfinished session, the UE leaves the wireless network coverage of PNI-NPN, enters the wireless network coverage of PLMN and is connected to the AMF along with the change of the user position 2 At this point the session that the UE has not yet ended is about to be interrupted. Thus, AMF 1 Transmitting a session management request carrying session slice information to OAM, wherein the session slice information is associated with a session which is not finished by the UE, and the OAM performs network resource configuration for user equipment according to the session slice information and selects AMF 3 Taking over the session that the UE has not ended, after the configuration is completed, the OAM indicates the AMF 2 Will be from AMF 1 The obtained context parameters of the UE are handed over to the AMF 3 At the same time OAM indicates AMF 3 Maintaining session of UE, AMF 3 Network resource allocation and AMF (advanced mechanical systems function) which can be made according to OAM (operation, administration and maintenance) 2 Care ofThe context parameters of the UE keep the session of the UE that has not yet ended.
As can be seen from the foregoing steps S11 to S12, in the session management method provided by the embodiment of the present invention, when the first AMF detects that the connected ue is switched to the second AMF and the ue has an unfinished session, the first AMF sends a session management request to the OAM, the OAM configures network resources for the ue according to session slice information carried in the session management request, instructs the second AMF to send context parameters of the ue to the third AMF, and instructs the third AMF to maintain the session of the ue, so that the third AMF maintains the session of the ue according to the network resource configuration and the context parameters. When the user equipment leaves the PNI-NPN wireless network coverage area and enters the wireless network coverage area of the PLMN bearing the PNI-NPN, the third AMF can keep the session which is not finished by the user equipment according to the network resource configuration made by the OAM and the context parameters of the user equipment forwarded by the second AMF, so that the ongoing session of the user equipment cannot be forced to be interrupted, and the user experience is improved.
It should be noted that, the third AMF may be an AMF in the PLMN, and the embodiment of the present invention does not specifically limit the third AMF, and the third AMF and the second AMF may also be the same AMF, where the OAM may only instruct the second AMF (and at the same time the third AMF) to keep the session of the UE, and since the second AMF has acquired the context parameter of the UE from the first AMF during the process of switching the UE from the first AMF to the second AMF, the second AMF may directly keep the session of the UE according to the network resource configuration and the context parameter made by the OAM.
In some embodiments, the network resource configuration includes partitioning radio network resources and allocating core network resources, and after instructing the second AMF to send context parameters of the user equipment to the third AMF and instructing the third AMF to maintain the session of the user equipment, the method may further comprise the steps of: responsive to the session ending, the partitioning of the radio network resources and the allocation of the core network resources are cancelled.
Wherein the wireless network resource can be time slice, frequency point, frequency band, wireless signal (including code, frequency, etc.), microwave, etc., and core networkThe resources may be network elements such as UPF (User Plane Function ) and SMF (Session Management Function, session management entity) for managing the user equipment session, or the core network resources may be allocated to create a network partition. AMF (advanced mechanical systems) 3 Mainly based on OAM divided wireless network resources and AMF 2 The context parameters of the handed-over UE keep the session of the UE that has not yet ended.
When the session of the UE is ended, the OAM needs to restore the network configuration made to keep the UE session uninterrupted, specifically, cancel dividing the radio network resources for the UE, that is, restore the configuration made when dividing the radio network resources for the UE; and canceling the allocation of the core network resources to the UE, i.e., restoring the configuration performed when the core network resources are allocated to the UE.
In some embodiments, the session slice information includes at least S-nsai (Single Network Slice Selection Assistance Information ) parameters corresponding to the session, and the configuring network resources for the user equipment according to the session slice information carried in the session management request may include the following steps: determining the wireless network resource requirement and the core network resource of the session according to the S-NSSAI parameters corresponding to the session; and allocating core network resources for the user equipment, and marking the wireless network resources meeting the wireless network resource requirements in the PLMN as PNI-NPN available wireless network resources.
The S-nsai parameter is an S-nsai value used by the session, and the S-nsai value has a one-to-one correspondence with the session, that is, if the UE has a plurality of sessions that are not ended, the S-nsai parameter includes a plurality of S-nsai values that respectively correspond to a plurality of sessions that are not ended by the UE one-to-one. AMF (advanced mechanical systems) 3 It may be that the OAM is created in the PLMN according to the core network resources allocated for the UE. According to the S-NSSAI value used by the session, the type of network elements such as UPF and SMF required by the session and the information such as service quality parameters can be determined, OAM can allocate core network resources for UE on the current route tracking area of the UE according to the S-NSSAI parameter in the session slice information, and determine the wireless network resource requirement of the UE, so that the PLMN is free of the wireless network resource requirement of the UEThe network resources are marked as PNI-NPN available wireless network resources for subsequent AMF 3 Can be marked according to OAM and AMF 2 The context parameters of the handed-over UE keep the session that the UE has not yet ended.
It should be noted that the session slice information may include an S-nsai value used by a session that is not ended by the ue, and may further include an identifier of a handover target AMF of the ue, that is, an identifier of the second AMF, and a route tracking area where the ue is currently located, that is, a wireless network coverage.
As shown in fig. 3, an embodiment of the present invention provides a session management method, which when applied to a third AMF, may include the following steps:
in step S21, in response to the context parameter of the ue sent by the second AMF and the instruction sent by the OAM to maintain the session of the ue, the session of the ue is maintained according to the network resource configuration and the context parameter made by the OAM.
The instruction of maintaining the session of the user equipment is sent by the OAM after receiving the session management request sent by the first AMF, and the PLMN where the first AMF is located carries the PNI-NPN where the second AMF is located.
When AMF 3 Receipt of AMF 2 When the transmitted UE context parameters and the OAM transmitted instruction for maintaining the session of the user equipment, the UE is out of the wireless network coverage of PNI-NPN, enters the wireless network coverage of PLMN and is connected to the AMF 2 At this point the session that the UE has not yet ended is about to be interrupted. Thus, AMF 3 Network resource allocation and AMF (advanced mechanical systems function) which can be made according to OAM (operation, administration and maintenance) 2 The sent context parameters keep the session of the terminal, so that the ongoing session of the user equipment is not forced to be interrupted due to the change of the position, and the user experience is improved.
In some embodiments, the network resource configuration includes dividing wireless network resources, and the maintaining the session of the user equipment according to the network resource configuration and the context parameters by the OAM may include the steps of: allocating wireless network resources for the user equipment according to the OAM divided wireless network resources and the context parameters so that the user equipment can perform session through the allocated wireless network resources; and forwarding NAS (Non-access Stratum) signaling sent by the user equipment to the first AMF, and forwarding the NAS signaling sent by the first AMF to the user equipment.
OAM marks wireless network resources meeting the wireless network resource requirements of UE in PLMN as PNI-NPN available wireless network resources, AMF 3 Receipt of AMF 2 After the transmitted context parameters and the instruction of maintaining the session of the ue transmitted by the OAM, the available radio network resources and AMF of the PNI-NPN marked by the OAM may be used 2 The transmitted context parameters allocate radio network resources for the UE so that the UE can pass through the AMF 3 The allocated wireless network resources are used for conversation; AMF (advanced mechanical systems) 3 Can also be used as relay AMF in UE and AMF 1 And forwarding NAS signaling of the UE to maintain the session connection of the UE. Equivalent to when the UE is in wireless network coverage of the PLMN, but still has access to the PNI-NPN.
Incidentally, AMF 3 Also can be used in UE and AMF by other AMFs 1 NAS signaling for forwarding UE between, i.e. UE and AMF 1 Not only does the transmission of NAS signaling between them need to be through AMF 3 The other AMFs also need to pass through, but at the moment, the other AMFs only play a role in forwarding and are still used by the AMFs 3 And allocating wireless network resources for the UE according to the network resource configuration and the context parameters made by the OAM, and indicating other AMFs to forward.
In some embodiments, after the session of the user equipment is maintained according to the network resource configuration and the context parameters by the OAM, the method may further include the steps of: in response to the session ending, the connection between the user equipment and the PNI-NPN is disconnected.
AMF when the session of UE is ended 3 The connection between the user equipment and the PNI-NPN may be forced to be broken.
It is emphasized that CAG (Closed Access Group ) is used for connection access control for UEs connected to PNI-NPN, and if one UE is marked as "connected only CAG cell", the UE can only access to PNI-NPN by connecting to the cell marked as CAG in PNI-NPN and cannot connect to the cell not marked as CAG. Thus, in embodiments of the present invention, the UE must not be marked as "connect CAG cell only" in order for the UE to be able to access the PNI-NPN by connecting to the cell not marked as CAG.
As shown in fig. 4, an embodiment of the present invention provides a session management method, which when applied to a first AMF, may include the following steps:
in step S31, in response to detecting that the ue connected to the current AMF is switched to the second AMF and that the ue has an unfinished session, a session management request is sent to the OAM, so that the OAM performs network resource configuration for the ue according to session slice information carried in the session management request, instructs the second AMF to send context parameters of the ue to the third AMF, and instructs the third AMF to maintain the session of the ue.
Wherein, the PLMN where the first AMF is located carries the PNI-NPN where the second AMF is located.
Initially, the UE is connected to the PNI-NPN, is in wireless network coverage of the PNI-NPN, and is AMF 1 And (5) connection. When AMF 1 Detecting a handover of a UE to AMF 2 And when the UE has an unfinished session, the UE leaves the wireless network coverage of PNI-NPN, enters the wireless network coverage of PLMN and is connected to the AMF along with the change of the user position 2 At this point the session that the UE has not yet ended is about to be interrupted. Thus, AMF 1 Transmitting a session management request carrying session slice information of a session which is not finished by the UE to the OAM, so that the OAM performs network resource configuration for the user equipment according to the session slice information and selects an AMF 3 Taking over the session that the UE has not ended, and after configuration is completed, indicating AMF 2 Will be from AMF 1 The obtained context parameters of the UE are handed over to the AMF 3 At the same time indicate AMF 3 Maintaining an as yet not-ended session for a UE, AMF 3 Network resource allocation and AMF (advanced mechanical systems function) which can be made according to OAM (operation, administration and maintenance) 2 The context parameters of the handed-over UE keep the session of the UE that has not yet ended. The method and the device can prevent the ongoing session of the user equipment from being forcedly interrupted due to the change of the position, and improve the user experience.
The session management method provided by the present invention is briefly described below with reference to fig. 1 in conjunction with a specific embodiment:
step 1, AMF 1 Detecting a handover of a UE to AMF 2 And the UE has an unfinished session, and sends a session management request to the OAM, wherein the session management request carries the following information: S-NSSAI value and AMF used by session not ended by UE 2 Is the identity of the route tracking area where the UE is currently located.
Step 2, OAM allocates core network resources for the UE in the current route tracking area of the UE according to the S-NSSAI value used by the session which is not ended by the UE, and marks the wireless network resources meeting the wireless network resource requirements of the UE in the PLMN as PNI-NPN available wireless network resources.
It should be noted that, as the location of the user changes, the route tracking area where the UE is located in step 2 may be different from the route tracking area where the UE is located in step 1.
Step 3, OAM indicates AMF 2 To AMF 3 Transmitting context parameters of a UE and indicating AMF 3 The session of the UE is maintained.
Step 4, AMF 3 Receiving an instruction sent by OAM to maintain a session of a UE and AMF 2 And the transmitted context parameters of the UE.
Step 5, AMF 3 And allocating wireless network resources for the UE according to the PNI-NPN available wireless network resources marked by the OAM and the context parameters.
Step 6, AMF 3 At UE and AMF 1 And forward NAS signaling of the UE.
And 7, ending the session of the UE.
Step 8, AMF 3 In response to the end of the session of the UE, the connection between the UE and the PNI-NPN is disconnected.
And 9, the OAM responds to the end of the session of the UE, the mark in the step 2 is canceled, and the core network resource allocated for the UE is canceled.
The flow ends up here.
Based on the same technical concept, as shown in fig. 5, an embodiment of the present invention further provides an operation administration and maintenance functional entity OAM, which may include:
a receiving module 101, configured to receive a session management request sent by the first access and mobility management function entity AMF.
A configuration module 102, configured to respond to a session management request sent by the first AMF, and perform network resource configuration for the user equipment according to session slice information carried in the session management request; the session management request is sent by the first AMF when detecting that the connected ue is switched to the second AMF and the ue has an unfinished session, and the public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located.
An indication module 103, configured to instruct the second AMF to send the context parameter of the user equipment to the third AMF, and instruct the third AMF to maintain the session of the user equipment, so that the third AMF maintains the session of the user equipment according to the network resource configuration and the context parameter.
In some embodiments, the network resource configuration includes partitioning the radio network resources and allocating the core network resources, and the configuration module 102 is further configured to cancel the partitioning of the radio network resources and allocating the core network resources in response to the session ending.
In some embodiments, the session slice information includes at least a single network slice selection assistance information S-nsai parameter corresponding to the session, and the configuration module 102 is configured to:
determining the wireless network resource requirement and the core network resource of the session according to the S-NSSAI parameters corresponding to the session;
and allocating core network resources for the user equipment, and marking the wireless network resources meeting the wireless network resource requirements in the PLMN as PNI-NPN available wireless network resources.
Based on the same technical concept, as shown in fig. 6, an embodiment of the present invention further provides a third access and mobility management function entity AMF, which may include:
a receiving module 201, configured to receive a context parameter of a user equipment sent by the second access and mobility management function entity AMF and an instruction for maintaining a session of the user equipment sent by the operation management and maintenance function entity OAM;
a processing module 202, configured to respond to the context parameter of the user equipment sent by the second AMF and an instruction for running the session of the user equipment to be maintained sent by the management and maintenance function entity OAM, and maintain the session of the user equipment according to the network resource configuration and the context parameter made by the OAM; the instruction of maintaining the session of the user equipment is sent by the OAM after receiving the session management request sent by the first AMF, where the public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located.
In some embodiments, the network resource configuration includes partitioning wireless network resources, and the processing module 202 is configured to:
allocating wireless network resources for the user equipment according to the OAM divided wireless network resources and the context parameters so that the user equipment can perform session through the allocated wireless network resources;
forwarding the NAS signaling of the non-access stratum sent by the user equipment to the first AMF, and forwarding the NAS signaling sent by the first AMF to the user equipment.
In some embodiments, the processing module 202 is further to: in response to the session ending, the connection between the user equipment and the PNI-NPN is disconnected.
Based on the same technical concept, as shown in fig. 7, an embodiment of the present invention further provides a first access and mobility management function entity AMF, which may include:
a detection module 301, configured to detect whether a user equipment connected to a current AMF is switched to a second AMF and whether the user equipment has an unfinished session;
a sending module 302, configured to send a session management request to an operation management and maintenance function entity OAM in response to detecting that a user equipment connected to a current AMF is switched to a second AMF and that the user equipment has an unfinished session, so that the OAM performs network resource configuration for the user equipment according to session slice information carried in the session management request, instructs the second AMF to send context parameters of the user equipment to a third AMF, and instructs the third AMF to maintain the session of the user equipment; the public land mobile network PLMN where the first AMF is located carries a public network-based non-public network PNI-NPN where the second AMF is located.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.

Claims (9)

1. A method of session management, the method comprising:
responding to a session management request sent by a first access and mobile management function entity AMF, and carrying out network resource allocation for user equipment according to the session slice information carried in the session management request; the session management request is sent by the first AMF when the connected user equipment is detected to be switched to a second AMF and the user equipment has an unfinished session, and a public land mobile network PLMN where the second AMF is located carries a public network-based non-public network PNI-NPN where the first AMF is located;
instruct the second AMF to send context parameters of the user equipment to a third AMF, and instruct the third AMF to maintain the session of the user equipment; for the third AMF to maintain the session of the user equipment according to the network resource configuration and the context parameters, comprising: and the third AMF allocates wireless network resources for the user equipment according to the network resource configuration and the context parameters, and forwards non-access stratum (NAS) signaling of the user equipment between the user equipment and the first AMF.
2. The method of claim 1, wherein the network resource configuration comprises partitioning radio network resources and allocating core network resources, and wherein after the instructing the second AMF to send context parameters for the user device to a third AMF, and instructing the third AMF to maintain the session for the user device, the method further comprises:
in response to the session ending, the partitioning of wireless network resources and the allocating of core network resources are cancelled.
3. The method of claim 2, wherein the session slice information at least includes a single network slice selection assistance information S-nsai parameter corresponding to the session, and the configuring network resources for the user equipment according to the session slice information carried in the session management request includes:
determining the wireless network resource requirement and the core network resource of the session according to the S-NSSAI parameters corresponding to the session;
and allocating the core network resource for the user equipment, and marking the wireless network resource meeting the wireless network resource requirement in the PLMN as the wireless network resource available by the PNI-NPN.
4. A method of session management, the method comprising:
responding to the context parameters of the user equipment sent by the second access and mobile management function entity AMF and the instruction of maintaining the session of the user equipment sent by the operation management and maintenance function entity OAM, and maintaining the session of the user equipment according to the network resource configuration made by the OAM and the context parameters; the instruction of maintaining the session of the user equipment is sent by the OAM after receiving a session management request sent by a first AMF, where the session management request is sent by the first AMF when detecting that the connected user equipment is switched to the second AMF and the user equipment has an unfinished session, so that the OAM configures network resources for the user equipment according to session slice information carried in the session management request; the public land mobile network PLMN where the second AMF is located carries a public network-based non-public network PNI-NPN where the first AMF is located;
wherein the network resource configuration includes dividing wireless network resources, and the maintaining the session of the ue according to the network resource configuration made by the OAM and the context parameter includes:
allocating wireless network resources for the user equipment according to the OAM divided wireless network resources and the context parameters so as to enable the user equipment to carry out session through the allocated wireless network resources;
forwarding non-access stratum (NAS) signaling sent by the user equipment to the first AMF, and forwarding NAS signaling sent by the first AMF to the user equipment.
5. The method of claim 4, wherein after maintaining the session of the user device according to the OAM network resource configuration and the context parameters, the method further comprises:
and in response to the session ending, disconnecting the connection between the user equipment and the PNI-NPN.
6. A method of session management, the method comprising:
in response to detecting that a user equipment connected with a current access and mobility management function entity (AMF) is switched to a second AMF and the user equipment has an unfinished session, sending a session management request to an operation management and maintenance function entity (OAM) so that the OAM can perform network resource configuration for the user equipment according to session slice information carried in the session management request, instructing the second AMF to send context parameters of the user equipment to a third AMF and instructing the third AMF to maintain the session of the user equipment; wherein, the public land mobile network PLMN where the second AMF is located carries a public network-based non-public network PNI-NPN where the first AMF is located;
the instructing a third AMF to maintain the session of the user equipment includes: and indicating the third AMF to allocate wireless network resources for the user equipment according to the network resource configuration and the context parameters, and forwarding non-access stratum (NAS) signaling of the user equipment between the user equipment and the first AMF.
7. An operation administration and maintenance function entity OAM, comprising:
the receiving module is used for receiving a session management request sent by the first access and mobile management function entity AMF;
the configuration module is used for responding to the session management request sent by the first AMF and carrying out network resource configuration for the user equipment according to the session slice information carried in the session management request; the session management request is sent by the first AMF when the connected user equipment is detected to be switched to a second AMF and the user equipment has an unfinished session, and a public land mobile network PLMN where the second AMF is located carries a public network-based non-public network PNI-NPN where the first AMF is located;
an indication module, configured to instruct the second AMF to send a context parameter of the user equipment to a third AMF, and instruct the third AMF to maintain the session of the user equipment; for the third AMF to maintain the session of the user equipment according to the network resource configuration and the context parameters, comprising: and the third AMF allocates wireless network resources for the user equipment according to the network resource configuration and the context parameters, and forwards non-access stratum (NAS) signaling of the user equipment between the user equipment and the first AMF.
8. A third access and mobility management function, AMF, comprising:
a receiving module, configured to receive a context parameter of a user equipment sent by a second access and mobility management function entity AMF and an indication of maintaining a session of the user equipment sent by an operation management and maintenance function entity OAM;
a processing module, configured to respond to a context parameter of a user equipment sent by a second AMF and an instruction for maintaining a session of the user equipment sent by an operation management and maintenance function entity OAM, and maintain the session of the user equipment according to a network resource configuration made by the OAM and the context parameter; the instruction of maintaining the session of the user equipment is sent by the OAM after receiving a session management request sent by a first AMF, where the session management request is sent by the first AMF when detecting that the connected user equipment is switched to the second AMF and the user equipment has an unfinished session, so that the OAM configures network resources for the user equipment according to session slice information carried in the session management request; the public land mobile network PLMN where the second AMF is located carries a public network-based non-public network PNI-NPN where the first AMF is located;
wherein, the processing module is used for: and allocating wireless network resources for the user equipment according to the network resource configuration and the context parameters, and forwarding non-access stratum (NAS) signaling of the user equipment between the user equipment and the first AMF.
9. A first access and mobility management function, AMF, comprising:
the detection module is used for detecting whether the user equipment connected with the current AMF is switched to the second AMF and whether the user equipment has an unfinished session;
a sending module, configured to send a session management request to an operation management and maintenance function entity OAM in response to detecting that a user equipment connected to a current AMF is switched to a second AMF and the user equipment has an unfinished session, so that the OAM performs network resource configuration for the user equipment according to session slice information carried in the session management request, instructs the second AMF to send a context parameter of the user equipment to a third AMF, and instructs the third AMF to maintain the session of the user equipment; wherein, the public land mobile network PLMN where the second AMF is located carries a public network-based non-public network PNI-NPN where the first AMF is located;
the instructing a third AMF to maintain the session of the user equipment includes: and indicating the third AMF to allocate wireless network resources for the user equipment according to the network resource configuration and the context parameters, and forwarding non-access stratum (NAS) signaling of the user equipment between the user equipment and the first AMF.
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