CN114095984A - Session management method, OAM and AMF - Google Patents

Session management method, OAM and AMF Download PDF

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Publication number
CN114095984A
CN114095984A CN202111288696.9A CN202111288696A CN114095984A CN 114095984 A CN114095984 A CN 114095984A CN 202111288696 A CN202111288696 A CN 202111288696A CN 114095984 A CN114095984 A CN 114095984A
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amf
session
user equipment
oam
network
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CN202111288696.9A
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CN114095984B (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 performing network resource configuration for user equipment according to session slice information carried in the session management request; the session management request is sent by a first AMF when detecting that a connected user equipment is 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 bears a public network-based non-public network PNI-NPN where the second AMF is located; 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, so that the third AMF maintains 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 conversation is not forced to be interrupted when the user equipment leaves the coverage range of the PNI-NPN wireless network and enters the coverage range of the wireless network 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 present invention relates to the field of communications technologies, and in particular, to a session management method, an OAM, a third AMF, and a first AMF.
Background
NPN (Non-public networks) is defined in a 5G (5th Generation Mobile Communication Technology, fifth Generation Mobile Communication Technology) network. NPN is used in private entities (e.g., businesses) that can be deployed using both 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 the PLMN or provided as a part of the PLMN is called a Public Network Integrated NPN (Public Network based NPN), and the PNI-NPN may be implemented by partitioning an independent Network resource for the NPN on the PLMN in a fragmentation manner, in which case, after a User on the PNI-NPN Network leaves a coverage of the PNI-NPN Network, an ongoing session connection on a UE (User Equipment) may be interrupted.
Therefore, a solution is needed to solve the above-mentioned deficiencies.
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 deficiencies in the prior art.
In order to achieve the above object, a first aspect of the present invention provides a session management method, including:
responding to a session management request sent by a first access and mobile management function entity (AMF), and performing network resource configuration for user equipment according to 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;
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 for the third AMF to maintain the session of the user equipment according to the network resource configuration and the context parameters.
Optionally, the network resource configuration includes dividing wireless 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:
responsive to the session ending, revoking the partitioning of the wireless network resources and the allocating of the core network resources.
Optionally, the session slice information at least includes a single network slice selection auxiliary information S-NSSAI parameter corresponding to the session, and the performing, according to the session slice information carried in the session management request, network resource configuration for the user equipment includes:
determining the wireless network resource requirement and the core network resource of the session according to the S-NSSAI parameter corresponding to the session;
allocating the core network resources for the user equipment, and marking the wireless network resources meeting the wireless network resource requirements in the PLMN as the wireless network resources available to the PNI-NPN.
In another aspect, the present invention provides a session management method, including:
in response to a context parameter of a user equipment sent by a second access and mobility management function entity (AMF) and an indication sent by an operation administration and maintenance function entity (OAM) for maintaining a session of the user equipment, maintaining the session of the user equipment according to a network resource configuration made by the OAM and the context parameter; the indication for maintaining the session of the user equipment 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 wireless network resources, and the maintaining a session of the user equipment according to the network resource configuration made by the OAM and the context parameter includes:
allocating wireless network resources to the user equipment according to the wireless network resources divided by the OAM and the context parameters, so that the user equipment can perform a 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 maintaining the session of the user equipment according to the network resource configuration made by the OAM and the context parameter, the method further includes:
disconnecting the connection between the user equipment and the PNI-NPN in response to the session ending.
In another aspect, the present invention provides a session management method, including:
in response to detecting that a user equipment connected with a current access and mobility management function (AMF) is switched to a second AMF and the user equipment has an unfinished session, sending a session management request to an Operation Administration and Maintenance (OAM) function entity, 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; and the public land mobile network PLMN where the first AMF is located bears a public network-based non-public network PNI-NPN where the second AMF is located.
In another aspect, the present invention provides an OAM, which includes:
the receiving module is used for receiving a session management request sent by a 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 ue sent by a second access and mobility management functional entity AMF and an indication sent by an operation, administration and maintenance functional entity OAM for maintaining a session of the ue;
a processing module, configured to respond to a context parameter of a user equipment sent by a second AMF and an indication sent by an operation, administration and maintenance functional entity, OAM, to maintain a session of the user equipment according to a network resource configuration made by the OAM and the context parameter; the indication for maintaining the session of the user equipment 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 a further aspect, the present invention provides 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 a second AMF and whether the user equipment has an unfinished session;
a sending module, configured to send, 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, a session management request to an operation, administration and maintenance entity, OAM, 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; and the public land mobile network PLMN where the first AMF is located bears a public network-based non-public network PNI-NPN where the second AMF is located.
The invention has the following advantages:
through the session management method provided by the invention, the first AMF sends the session management request to the OAM when detecting that the connected user equipment is switched to the second AMF and the user equipment has an unfinished session, 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 parameter of the user equipment to the third AMF, and instructs the third AMF to maintain the session of the user equipment, so that the third AMF can maintain the session of the user equipment according to the network resource configuration and the context parameter. When the user equipment leaves the PNI-NPN wireless network coverage range and enters the wireless network coverage range of the PNI-NPN bearing PLMN, the third AMF can keep the session which is not ended yet 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 session which is in progress by the user equipment cannot be interrupted forcibly, and the user experience is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit 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 schematic flowchart of a session management method on an OAM side according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a third AMF-side session management method according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a first AMF-side session management method according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of OAM provided in this embodiment of the present invention;
FIG. 6 is a 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 present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
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 embodiments and features of the embodiments can be combined with each other without conflict.
It is to be understood that, for the convenience of description, only parts related to the present invention are shown in the drawings of the present invention, and parts not related to the present invention are not shown in the drawings.
It should be understood that each unit and module related in the embodiments of the present invention may correspond to only one physical structure, may also be composed of multiple physical structures, or multiple units and modules may also be integrated into one physical structure.
It will be understood that, without conflict, the functions, steps, etc. noted in the flowchart and block diagrams of the present invention may occur in an order different from that noted in the figures.
It is to be understood that the flowchart and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatus, devices and methods according to various embodiments of the present invention. Each block in the flowchart or block diagrams may represent a unit, module, segment, code, which comprises executable instructions for implementing the specified function(s). Furthermore, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by a hardware-based system that performs the specified functions or by a combination of hardware and computer instructions.
It is to be understood that the units and modules involved in the embodiments of the present invention may be implemented by software, and may also be implemented by hardware, for example, the units and modules may be located in a processor.
The session Management method provided in the embodiment of the present invention, as shown in fig. 1, may be applied to a PNI-NPN, a PLMN, an Access and Mobility Management Function (AMF) in the PNI-NPN, an AMF in the PLMN, and an OAM (Operation Administration and Ma) in the PLMN, and may be applied to a PNI-NPN, a PLMN, and an OAM (Access and Mobility Management Function) in the PNI-NPNThe session management system includes an enterprise, an operation management and maintenance functional entity, a UE (User Equipment), and the like, where a PLMN carries PNI-NPN, and the PNI-NPN is an NPN network constructed based on network fragmentation on the PLMN. The solid oval represents the core network range, the dashed oval represents the radio network coverage, AMF1(i.e., the first AMF), AMF3(i.e., the third AMF) represents AMF in PNI-NPN, AMF2(i.e., the second AMF) represents the AMF in the PLMN, OAM is responsible for completing parameter management and configuration for the PLMN, and UE (i.e., user equipment) may be in the wireless network coverage of PNI-NPN and/or PLMN.
As shown in fig. 2, an embodiment of the present invention provides a session management method, which when applied to OAM, may include the following steps:
in step S11, in response to the session management request sent by the first AMF, network resource configuration 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 the connected user equipment is detected to be switched to the second AMF and the user equipment 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 the 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 may be an AMF temporarily created in the PLMN by OAM.
Initially, the UE is connected to the PNI-NPN, in the PNI-NPN wireless network coverage, and AMF1And (4) connecting. When AMF1Detecting a handover of a UE to an AMF2And when the UE has an unfinished session, the UE leaves the wireless network coverage of the PNI-NPN and enters the wireless network coverage of the PLMN to be connected to the AMF along with the change of the user position2At this point, the session that the UE has not finished is about to be interrupted. Thus, AMF1Sending a session management request carrying session slice information to the OAM, theThe session slice information is associated with the session which is not finished by the UE, the OAM performs network resource configuration for the user equipment according to the session slice information and selects the AMF3Taking over the session of UE which is not finished, after the configuration is finished, OAM indicates AMF2Will be derived from AMF1Transfer of obtained context parameters of UE to AMF3While OAM indicates AMF3Maintaining sessions, AMF, of UEs3Network resource allocation and AMF according to OAM2The context parameters of the handed-over UE keep the not yet ended session of the UE.
As can be seen from the foregoing steps S11-S12, in the session management method provided in the embodiment of the present invention, when it is detected 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 performs network resource configuration for the ue according to the session slice information carried in the session management request, instructs the second AMF to send the context parameter 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 parameter. When the user equipment leaves the PNI-NPN wireless network coverage range and enters the wireless network coverage range of the PNI-NPN bearing PLMN, the third AMF can keep the session which is not ended yet 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 session which is in progress by the user equipment cannot be interrupted forcibly, and the user experience is improved.
It should be noted that the third AMF may be an AMF in a PLMN, and in the embodiment of the present invention, the third AMF is not specifically limited, and the third AMF and the second AMF may also be the same AMF, at this time, the OAM may only indicate that the second AMF (and the third AMF) maintains the session of the UE, because the second AMF has already obtained the context parameter of the UE from the first AMF in the process of switching the UE from the first AMF to the second AMF, the second AMF may directly maintain the session of the UE according to the network resource configuration and the context parameter that the OAM does.
In some embodiments, the network resource configuration includes dividing wireless 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 include the steps of: responsive to the session ending, wireless network resources are de-partitioned and core network resources are allocated.
The radio network resource may be a time slice, a frequency point, a frequency band, a radio signal (including a code, a frequency, etc.), a microwave, etc., and the core network resource may be a network element such as a User Plane Function (UPF), a Session Management Function (SMF), etc., which manages a Session of the User equipment, and the allocating the core network resource may also be creating a network slice. AMF3Mainly based on wireless network resources and AMF divided by OAM2The context parameters of the handed-over UE keep the not yet ended session of the UE.
When the session of the UE is over, the OAM needs to restore the network configuration for keeping the UE session uninterrupted, specifically, canceling the division of the wireless network resources for the UE, that is, restoring the configuration performed when the wireless network resources are divided for the UE; and canceling the allocation of the core network resources for the UE, namely recovering the configuration performed when the core network resources are allocated for the UE.
In some embodiments, the session Slice Information at least includes an S-NSSAI (Single Network Slice Selection Assistance Information) parameter corresponding to a session, and performing Network resource configuration 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 parameter 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 the wireless network resources available for PNI-NPN.
Wherein, the S-NSSAI parameter is an S-NSSAI value used by the session, and the S-NSSAI values have a one-to-one correspondence relationship with the session, that is, if the UE has a plurality of sessions that are not ended, the S-NSSAI parameter includes a plurality of S-NSSAI values, which respectively correspond to the plurality of sessions that are not ended by the UE one-to-one。AMF3OAM may be 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 types of network elements such as UPF and SMF required by the session, the service quality parameters and other information can be determined, OAM can allocate core network resources for UE and determine the wireless network resource requirements of the UE on the current routing tracking area of the UE according to the S-NSSAI parameter in the session slice information, and the wireless network resources meeting the wireless network resource requirements of the UE in PLMN are marked as PNI-NPN available wireless network resources so as to facilitate the follow-up AMF3Marking that can be done according to OAM and AMF2The context parameters of the handed-over UE keep the session that the UE has not ended.
It should be noted that the session slice information may include an S-NSSAI value used by a session that is not ended by the ue, and may also include an identifier of a handover target AMF of the ue, that is, an identifier of a second AMF, and a route tracking area where the ue is currently located, that is, a coverage area of a wireless network.
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 user equipment sent by the second AMF and the indication of maintaining the session of the user equipment sent by the OAM, the session of the user equipment is maintained according to the network resource configuration and the context parameter made by the OAM.
The indication for 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 AMF3Receiving AMF2When the UE context parameter and the indication of keeping the session of the user equipment are sent by the OAM, the UE leaves the wireless network coverage of the PNI-NPN and enters the wireless network coverage of the PLMN to be connected to the AMF2At this point, the session that the UE has not finished is about to be interrupted. Thus, AMF3Network resource allocation and AMF according to OAM2The transmitted context parameters maintain the session of the terminal so that it will notDue to the change of the position, the ongoing conversation of the user equipment is forced to be interrupted, and the user experience is improved.
In some embodiments, the network resource configuration includes partitioning wireless network resources, and the maintaining a session of the user equipment according to the network resource configuration and the context parameters made by the OAM may include the following steps: allocating wireless network resources to the user equipment according to the wireless network resources divided by the OAM and the context parameters so that the user equipment can perform conversation through the allocated wireless network resources; forwarding NAS (Non-access Stratum) signaling sent by the user equipment to the first AMF, and forwarding NAS signaling sent by the first AMF to the user equipment.
The OAM marks the wireless network resources meeting the wireless network resource requirements of the UE in the PLMN as PNI-NPN available wireless network resources, AMF3Receiving AMF2The sent context parameters and the OAM sent indication of keeping the session of the user equipment, the PNI-NPN available wireless network resources and AMF can be marked according to the OAM2The sent context parameters allocate wireless network resources for the UE so that the UE can pass through the AMF3The allocated wireless network resources are used for carrying out conversation; AMF3It can also be used as relay AMF in UE and AMF1Forwarding NAS signaling of the UE to maintain session connectivity of the UE. Corresponding to the UE being in the wireless network coverage of the PLMN at this time, but still accessing the PNI-NPN.
It should be noted that AMF3It can also be through other AMFs at UE and AMF1Between NAS signaling of the UE, i.e. UE and AMF1The NAS signaling is transmitted between the two devices not only through the AMF3Other AMFs are needed to pass through, but only have forwarding function at the moment, and the AMFs still pass through3And allocating wireless network resources for the UE and indicating other AMFs for forwarding according to the network resource configuration and the context parameters made by the OAM.
In some embodiments, after maintaining the session of the user equipment according to the network resource configuration and the context parameter made by 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 over3The connection between the user equipment and the PNI-NPN can be forcibly disconnected.
It is emphasized that the CAG (Closed Access Group) is used for connection Access control of the PNI-NPN connected UEs, and if one UE is marked as "CAG cell only connected", the UE can only Access the PNI-NPN by connecting the cells marked as CAG in the PNI-NPN and cannot connect the cells not marked as CAG. Therefore, in the embodiment of the present invention, the UE must not be marked as "connected to only the CAG cell" to enable the UE 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 the ue has an unfinished session, send a session management request to the OAM, so that the OAM configures network resources for the ue according to the 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.
And 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, in the PNI-NPN wireless network coverage, and AMF1And (4) connecting. When AMF1Detecting a handover of a UE to an AMF2And when the UE has an unfinished session, the UE leaves the wireless network coverage of the PNI-NPN and enters the wireless network coverage of the PLMN to be connected to the AMF along with the change of the user position2At this point, the session that the UE has not finished is about to be interrupted. Thus, AMF1Sending 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 can carry out network resource configuration for the user equipment according to the session slice information and select the AMF3Taking over the session of UE which is not finished, and indicating AMF after configuration is finished2Will be derived from AMF1Obtained UE's upper partContext parameters are handed over to AMF3While indicating AMF3Maintaining an as yet unfinished session, AMF, of a UE3Network resource allocation and AMF according to OAM2The context parameters of the handed-over UE keep the not yet ended session of the UE. Therefore, ongoing conversation of the user equipment is not forced to be interrupted due to the change of the position, and the user experience is improved.
The following briefly describes the session management method provided by the present invention with reference to fig. 1 and a specific embodiment:
step 1, AMF1Detecting a handover of a UE to an AMF2And 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, AMF, used by UE-not-ended sessions2And the route tracking area where the UE is currently located.
And 2, OAM allocates core network resources for the UE in a current routing 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 which meet 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 user location changes, the routing tracking area where the UE is located in step 2 may be different from the routing tracking area where the UE is located in step 1.
Step 3, OAM indication AMF2To AMF3Sending context parameters of the UE, and indicating AMF3The session of the UE is maintained.
Step 4, AMF3Receiving an indication of maintaining a session of a UE and an AMF sent by OAM2Context parameters of the transmitted UE.
Step 5, AMF3And 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, AMF3At UE and AMF1Forwarding NAS signaling of the UE.
And 7, ending the session of the UE.
Step 8, AMF3Disconnecting the UE from the PNI in response to the end of the session for the UE-a connection between NPN.
And 9, responding to the session end of the UE, the OAM cancels the mark in the step 2, and cancels the core network resource distributed for the UE.
The process ends.
Based on the same technical concept, as shown in fig. 5, an embodiment of the present invention further provides an OAM, which may include:
a receiving module 101, configured to receive a session management request sent by a first access and mobility management function entity AMF.
The configuration module 102 is 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 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 the non-public network PNI-NPN based on the public network where the second AMF is located.
An instructing 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 wireless network resources and allocating core network resources, and the configuration module 102 is further configured to, in response to the session ending, un-partition wireless network resources and allocating core network resources.
In some embodiments, the session slice information at least includes a single network slice selection assistance information S-NSSAI 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 parameter 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 the wireless network resources available for PNI-NPN.
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 ue sent by a second access and mobility management functional entity AMF and an indication of maintaining a session of the ue sent by an operation, administration and maintenance functional entity OAM;
a processing module 202, configured to respond to the context parameter of the user equipment sent by the second AMF and an indication of maintaining the session of the user equipment sent by the operation, administration and maintenance functional 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 indication for maintaining the session of the user equipment is sent by the OAM after receiving a session management request sent by the first AMF, 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.
In some embodiments, the network resource configuration includes partitioning wireless network resources, and the processing module 202 is configured to:
allocating wireless network resources to the user equipment according to the wireless network resources divided by the OAM and the context parameters so that the user equipment can perform conversation through the allocated wireless network resources;
and forwarding the non-access stratum NAS signaling 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 configured 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 detecting module 301, configured to detect whether a ue connected to a current AMF is handed over to a second AMF and whether the ue has an unfinished session;
a sending module 302, configured to send, 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, a session management request to an operation, administration and maintenance entity, OAM, to perform network resource configuration for the user equipment according to session slice information carried in the session management request, 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; and the public land mobile network PLMN where the first AMF is located bears a public network-based non-public network PNI-NPN where the second AMF is located.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (10)

1. A method for session management, the method comprising:
responding to a session management request sent by a first access and mobile management function entity (AMF), and performing network resource configuration for user equipment according to 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;
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 for the third AMF to maintain the session of the user equipment according to the network resource configuration and the context parameters.
2. The method of claim 1, wherein the network resource configuration comprises partitioning wireless network resources and allocating core network resources, and wherein after the instructing the second AMF to send context parameters for the user equipment to a third AMF, and instructing the third AMF to maintain the session for the user equipment, the method further comprises:
responsive to the session ending, revoking the partitioning of the wireless network resources and the allocating of the core network resources.
3. The method according to claim 2, wherein the session slice information at least includes a single network slice selection assistance information S-NSSAI parameter corresponding to the session, and the performing network resource configuration for the ue 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 parameter corresponding to the session;
allocating the core network resources for the user equipment, and marking the wireless network resources meeting the wireless network resource requirements in the PLMN as the wireless network resources available to the PNI-NPN.
4. A method for session management, the method comprising:
in response to a context parameter of a user equipment sent by a second access and mobility management function entity (AMF) and an indication sent by an operation administration and maintenance function entity (OAM) for maintaining a session of the user equipment, maintaining the session of the user equipment according to a network resource configuration made by the OAM and the context parameter; the indication for maintaining the session of the user equipment 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.
5. The method of claim 4, wherein the network resource configuration comprises partitioning wireless network resources, and wherein maintaining the session for the user equipment according to the network resource configuration made by the OAM and the context parameters comprises:
allocating wireless network resources to the user equipment according to the wireless network resources divided by the OAM and the context parameters, so that the user equipment can perform a 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.
6. The method according to claim 5, wherein after the network resource configuration made according to the OAM and the context parameter maintain the session of the user equipment, the method further comprises:
disconnecting the connection between the user equipment and the PNI-NPN in response to the session ending.
7. A method for session management, the method comprising:
in response to detecting that a user equipment connected with a current access and mobility management function (AMF) is switched to a second AMF and the user equipment has an unfinished session, sending a session management request to an Operation Administration and Maintenance (OAM) function entity, 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; and the public land mobile network PLMN where the first AMF is located bears a public network-based non-public network PNI-NPN where the second AMF is located.
8. An operation, administration and maintenance function, OAM, entity, comprising:
the receiving module is used for receiving a session management request sent by a 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.
9. A third access and mobility management function, AMF, comprising:
a receiving module, configured to receive a context parameter of a ue sent by a second access and mobility management functional entity AMF and an indication sent by an operation, administration and maintenance functional entity OAM for maintaining a session of the ue;
a processing module, configured to respond to a context parameter of a user equipment sent by a second AMF and an indication sent by an operation, administration and maintenance functional entity, OAM, to maintain a session of the user equipment according to a network resource configuration made by the OAM and the context parameter; the indication for maintaining the session of the user equipment 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.
10. 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 a second AMF and whether the user equipment has an unfinished session;
a sending module, configured to send, 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, a session management request to an operation, administration and maintenance entity, OAM, 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; and the public land mobile network PLMN where the first AMF is located bears a public network-based non-public network PNI-NPN where the second AMF is located.
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