CN111436161B - Session management method and SMF entity - Google Patents

Session management method and SMF entity Download PDF

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Publication number
CN111436161B
CN111436161B CN201910028652.9A CN201910028652A CN111436161B CN 111436161 B CN111436161 B CN 111436161B CN 201910028652 A CN201910028652 A CN 201910028652A CN 111436161 B CN111436161 B CN 111436161B
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pdu session
smf entity
entity
terminal equipment
activated
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CN111436161A (en
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王胡成
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections

Abstract

The invention discloses a session management method and an SMF entity, which are used for reducing system overhead. The session management method comprises the following steps: a Session Management Function (SMF) entity receives a notification message from a Radio Access Network (RAN), wherein the notification message carries indication information of whether a second Protocol Data Unit (PDU) session can be activated for a terminal device or capability information of a base station; the SMF entity determines that the second PDU session can be activated for the terminal equipment according to the notification message, and then notifies the terminal equipment to create or activate the second PDU session, wherein the SMF entity serves the first PDU session; or; and the SMF entity determines that the second PDU session can not be activated for the terminal equipment according to the notification message, and notifies the terminal equipment to delete or deactivate the second PDU session, wherein the SMF entity serves the second PDU session.

Description

Session management method and SMF entity
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a session management method and an SMF entity.
Background
The third Generation Partnership Project (3 GPP) has studied a related technology for providing ultra-low latency and ultra-high reliability communication in the fifth Generation mobile communication (5G) Network, and proposes that two Protocol Data Unit (PDU) sessions are established by the Network for high reliability service, and the two PDU sessions respectively use different Radio Access Network (RAN) and User Plane Function (UPF) entities.
In the prior art, a User Equipment (UE) uses a specific indication to request a network to create two PDU sessions that are backup to each other, but the method makes a requirement for the UE, that is, the UE needs to determine whether to establish a backup path. However, the UE does not know whether the network supports establishing the backup path, and thus creating two PDU sessions may not result in an improvement in reliability, but rather increases system overhead.
Disclosure of Invention
The embodiment of the invention provides a session management method and an SMF entity, which are used for reducing system overhead.
In a first aspect, a session management method is provided, where the method includes:
a Session Management Function (SMF) entity receives a notification message from a Radio Access Network (RAN), wherein the notification message carries indication information of whether a second Protocol Data Unit (PDU) session can be activated for a terminal device or capability information of a base station;
the SMF entity establishes or activates the second PDU session if determining that the second PDU session can be activated for the terminal equipment according to the notification message, wherein the SMF entity serves the first PDU session; or;
and the SMF entity deletes or deactivates the second PDU session if determining that the second PDU session cannot be activated for the terminal equipment according to the notification message, wherein the SMF entity serves the second PDU session.
In the embodiment of the present invention, the RAN may notify a Session Management Function (SMF) entity whether or not the SMF entity itself can activate the second PDU Session for the terminal device, so that the SMF entity notifies the terminal device to activate the second PDU Session when determining that the RAN can activate the second PDU Session for the terminal device, so as to improve the reliability of data transmission as effectively as possible. And if the RAN is determined not to be capable of activating the second PDU session for the terminal equipment, notifying the terminal equipment to delete or deactivate the second PDU session so as to reduce system overhead.
Optionally, the capability information of the base station is information that the RAN supports dual connectivity or does not support dual connectivity.
In the embodiment of the invention, the RAN can inform the SMF entity whether to activate the second PDU session for the terminal equipment or not by informing the SMF entity whether to support the dual connectivity or not.
Optionally, the method further includes:
and the SMF entity sends an indication message to the RAN in the process of creating the first PDU session, wherein the indication message is used for indicating whether the RAN can activate a second PDU session for the terminal equipment or not.
Optionally, the method further includes:
and if the SMF entity determines that a second PDU session can be activated for the terminal equipment, sending information carrying the identification ID of the second SMF entity of the second PDU session to an access and mobility management function (AMF) entity so that the AMF entity selects the second SMF entity for the second PDU session.
Optionally, the method further includes:
and establishing the second PDU session for the terminal equipment through the SMF entity stored by the AMF entity.
Optionally, after the SMF entity determines that the second PDU session can be activated for the terminal device according to the notification message, and then creates or activates the second PDU session, the method further includes:
and if the SMF entity determines that the second PDU session cannot be activated for the terminal equipment according to the re-received notification, the SMF entity refuses the request of the terminal equipment for creating the second PDU session.
In a second aspect, there is provided a session management function, SMF, entity, the SMF entity comprising:
a memory to store instructions;
a processor for reading the instructions in the memory, performing the following processes:
receiving a notification message from a Radio Access Network (RAN), wherein the notification message carries indication information of whether a second Protocol Data Unit (PDU) session can be activated for a terminal device or capability information of a base station;
if the fact that the second PDU session can be activated for the terminal equipment is determined according to the notification message, the second PDU session is created or activated, wherein the SMF entity serves the first PDU session; or;
determining that the second PDU session cannot be activated for the terminal equipment according to the notification message, and deleting or deactivating the second PDU session, wherein the SMF entity serves the second PDU session;
the transceiver is used for transmitting information under the control of the processor.
Optionally, the capability information of the base station is information that the RAN supports dual connectivity or does not support dual connectivity.
Optionally, the processor is further configured to:
and in the process of creating the first PDU session, sending an indication message to the RAN, wherein the indication message is used for indicating whether the RAN can activate a second PDU session for the terminal equipment or not.
Optionally, the processor is further configured to:
and if the fact that the second PDU session can be activated for the terminal equipment is determined, sending information carrying the identification ID of a second SMF entity of the second PDU session to an access and mobility management function (AMF) entity, so that the AMF entity selects the second SMF entity for the second PDU session.
Optionally, the processor is further configured to:
and establishing the second PDU session for the terminal equipment through the SMF entity stored by the AMF entity.
Optionally, the processor is further configured to:
and if the second PDU session cannot be activated for the terminal equipment according to the re-received notification, rejecting the request of the terminal equipment for creating the second PDU session.
In a third aspect, a session management function, SMF, entity is provided, the SMF entity comprising:
a receiving unit, configured to receive a notification message from a radio access network RAN, where the notification message carries indication information indicating whether a second protocol data unit PDU session can be activated for a terminal device or capability information of a base station;
a first notification unit, configured to establish or activate the second PDU session if it is determined that the second PDU session can be activated for the terminal device according to the notification message, where the SMF entity serves the first PDU session; or;
and a second notification unit, configured to delete or deactivate the second PDU session if it is determined that the second PDU session cannot be activated for the terminal device according to the notification message, where the SMF entity serves the second PDU session.
Optionally, the capability information of the base station is information that the RAN supports dual connectivity or does not support dual connectivity.
Optionally, the first notification unit is further configured to:
and in the process of creating the first PDU session, sending an indication message to the RAN, wherein the indication message is used for indicating whether the RAN can activate a second PDU session for the terminal equipment or not.
Optionally, the first notification unit is further configured to:
and if the fact that the second PDU session can be activated for the terminal equipment is determined, sending information carrying the identification ID of a second SMF entity of the second PDU session to an access and mobility management function (AMF) entity, so that the AMF entity selects the second SMF entity for the second PDU session.
Optionally, the first notification unit is further configured to:
and establishing the second PDU session for the terminal equipment through the SMF entity stored by the AMF entity.
Optionally, the receiving unit is further configured to:
and if the second PDU session cannot be activated for the terminal equipment according to the re-received notification, rejecting the request of the terminal equipment for creating the second PDU session.
In a fourth aspect, there is provided a computer readable storage medium having stored thereon computer instructions which, when run on a computer, cause the computer to perform the method according to the first aspect.
In the embodiment of the invention, the RAN can inform the SMF entity whether to activate the second PDU session for the terminal equipment, so that the SMF entity creates or activates the second PDU session when determining that the RAN can activate the second PDU session for the terminal equipment, thereby effectively improving the reliability of data transmission as much as possible. And if the SMF entity determines that the RAN can not activate the second PDU session for the terminal equipment, deleting or deactivating the second PDU session so as to reduce the system overhead.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a session management method according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a session management method according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a session management method according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a session management method according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a session management method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an SMF entity according to an embodiment of the present invention;
fig. 7 is another schematic structural diagram of an SMF entity according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Currently, a UE uses a specific indication to request a network to create two PDU sessions that are backup to each other, but the UE needs to determine whether to establish a backup path, and the UE does not know whether the network supports the establishment of the backup path, so that creating two PDU sessions may not bring reliability improvement, but increase system overhead.
In view of this, an embodiment of the present invention provides a session management method, in which a RAN may notify an SMF entity whether the SMF entity itself can activate a second PDU session for a terminal device, so that the SMF entity creates or activates the second PDU session when determining that the RAN can activate the second PDU session for the terminal device, so as to improve reliability of data transmission as effectively as possible. And if the SMF entity determines that the RAN can not activate the second PDU session for the terminal equipment, deleting or deactivating the second PDU session so as to reduce the system overhead.
The technical scheme provided by the embodiment of the invention is described below by combining the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a session management method, which can be executed by an SMF entity provided in the embodiment of the present invention, and a flow of the session management method is described as follows.
S101, an SMF entity receives a notification message from RAN, wherein the notification message carries indication information of whether a second PDU session can be activated for terminal equipment or capability information of a base station;
s102, the SMF entity determines that a second PDU session can be activated for the terminal equipment according to the notification message, and then the second PDU session is created or activated, and the SMF entity serves the first PDU session;
s103, the SMF entity determines that the second PDU session can not be activated for the terminal equipment according to the notification message, and then deletes or deactivates the second PDU session, and the SMF entity serves the second PDU session.
In the embodiment of the present invention, a terminal device may request to establish a PDU session according to an existing flow, specifically, please refer to the flow shown in fig. 2:
s201, a terminal device, for example, a UE, sends a PDU Session Establishment Request (PDU Session Establishment Request) to an Access and Mobility Management Function (AMF) entity.
S202, after receiving the PDU session establishment Request, the AMF entity sends a PDU session SM context creation Request message (Nsmf _ PDU _ creation _ Request) to the SMF entity 1.
S203, after receiving the PDU Session establishment SM context request message, the SMF entity 1 or the UPF entity 1 obtains a Session Management (SM) subscription.
S204, SMF entity 1 or UPF entity 1 sends a PDU session creation SM context Response message (Nsmf _ PDU _ creation _ SMs _ Response) to the AMF entity according to the SM subscription.
S205, after receiving the PDU session establishment request, the SMF entity invokes an N1N2message passing (Namf _ Communication _ N1N2message transfer) service passing N2message of the AMF.
S206, the AMF entity sends an N2PDU Session Request (N2PDU Session Request) to the RAN to Request the establishment of an air interface bearer for the PDU Session. In a possible embodiment, the over-the-air transmission of the PDU session is provided by the primary base station.
S207, the RAN creates an air interface bearer for the PDU Session and sends an N2PDU Session Response (N2PDU Session Response) to the AMF entity.
S208, the AMF entity sends a PDU session creation SM context message (Nsmf _ PDU _ creation _ SM _ context) to the SMF entity 1 or the UPF entity 1, and the SMF entity 1 or the UPF entity 1 creates a first PDU session for the terminal device.
Considering that, for a high-reliability service, a terminal device may request a network to create two PDU sessions that are backup to each other, in the embodiment of the present invention, an SMF entity 1 may send an indication message to a RAN during creating a first PDU session, where the indication message requests the RAN to report whether a second PDU session can be activated for the terminal device. The RAN receives the indication message and reports to the SMF entity 1 whether the second PDU session can be activated for the terminal device. In a possible embodiment, the RAN reports a notification message to the SMF entity 1 or the UPF entity 1, where the notification message carries indication information of whether the second PDU session can be activated for the terminal device or capability information of the base station, where the capability information of the base station is, for example, information that the RAN supports dual connectivity or does not support dual connectivity, and if the RAN supports dual connectivity, it indicates that the RAN can activate the second PDU session for the terminal device, and if the RAN does not support dual connectivity, it indicates that the RAN cannot activate the second PDU session for the terminal device.
The RAN may also be caused to switch from dual connectivity supported to dual connectivity unsupported, or vice versa, due to terminal device movement or network device configuration changes. At this time, if the terminal device establishes two mutually backup PDU sessions, for the PDU session served by the slave network device, that is, the second PDU session, a notification1 is sent to the SMF entity 2 or the UPF entity 2 serving the second PDU session to notify that the RAN does not support dual connectivity, and the notification1 is forwarded by the AMF entity, for example, please continue to refer to the flow shown in fig. 2.
S209, the RAN sends a first notice to the AMF entity, wherein the first notice carries the identification of the second PDU session.
S210, the AMF entity sends the second PDU session setup SM context to the SMF entity 2 or the UPF entity 2.
Wherein the SMF entity 2 or the UPF entity 2 serving the second PDU session receives the notification message from the slave network device.
Likewise, the RAN may also be caused to switch from dual connectivity not supported to dual connectivity supported due to terminal device movement or network device configuration changes, etc. At this time, if the terminal device establishes two mutually backup PDU sessions, a second notification (notification2) is sent to the SMF entity 1 or the UPF entity 1 serving the first PDU session for the PDU session served by the primary network device, i.e. the first PDU session, to inform the RAN that dual connectivity is supported, which notification2 is forwarded by the AMF entity. For example, please continue to refer to the flow shown in fig. 2.
S211, the RAN sends a second notice to the AMF entity, and the second notice carries the identification of the first PDU session.
S212, the AMF entity sends the first PDU session setup SM context to the SMF entity 1 or the UPF entity 1.
If the terminal device has established the first PDU session according to the procedure shown in fig. 2, and then if the SMF entity 1 or the UPF entity 1 serving the first PDU session determines that the second PDU session can be activated for the terminal device according to the report of the RAN, the terminal device is notified to create or activate the second PDU session. Specifically, the SMF entity 1 or the UPF entity 1 serving the first PDU session may determine the SMF entity 2 or the UPF entity 2 serving the second PDU session according to the subscription information of the terminal device and/or the configuration of the operator, and notify the AMF entity of the SMF entity 2 or the UPF entity 2 serving the second PDU session, where the specific flow is shown in fig. 3.
S301, the SMF entity 2 or the UPF entity 2 sends information carrying the identification ID of the second SMF entity of the second PDU session to the AMF entity, for example, the SMF entity sends an N1N2 messaging (Namf _ Communication _ N1N2message transfer) service transfer N2message to the AMF entity, so that the AMF entity selects the SMF entity 2 or the UPF entity 2 for the second PDU session.
S302, the AMF entity saves the ID of the SMF entity 2 or the UPF entity 2 serving the second PDU session, and saves the ID to the second PDU session context. Thus, in the embodiment of the present invention, when the terminal device creates the second PDU session, the SMF entity stored in the AMF entity may be used to create the second PDU session for the terminal device. Specifically, please continue to refer to the flow shown in fig. 3.
S303, the AMF entity responds to the PDU Session Establishment request sent by the terminal device, and sends a PDU Session Establishment Accept message (PDU Session Establishment Accept) to the terminal device.
S304, the terminal device requests to create a second PDU Session, and may send a PDU Session Establishment Request (PDU Session Establishment Request) to the AMF entity, where the PDU Session Establishment Request carries a second PDU Session identifier, or carries a first PDU Session identifier and a second PDU Session identifier (old and new PDU Session ID).
S305, the AMF entity receives the PDU session establishment request, finds the correspondingly stored SMF entity 2 or UPF entity 2 according to the second PDU session identification, and sends the PDU session establishment SM context request to the SMF entity 2 or UPF entity 2 to inform the SMF entity 2 or UPF entity 2 of establishing the second PDU session. Of course, the SMF entities of the first PDU session and the second PDU session may be the same or different.
In a possible implementation manner, please refer to fig. 4, the embodiment of the present invention may also trigger the establishment of the second PDU session through signaling. The procedure for establishing the first PDU session is consistent with that shown in fig. 3, and is not described herein again. In fig. 4, after the AMF entity stores the SMF entity 2 serving for the second PDU session, step S401 is executed, and the AMF entity sends a PDU session modification request (PDU session modification request) to the terminal device to trigger the terminal device to create the second PDU session.
S402, the terminal device sends a second PDU session creation request to the AMF to request for creating a second PDU session, and a process of creating the second PDU session is consistent with that shown in fig. 3, which is not described herein again.
In the embodiment of the present invention, if the SMF entity 1 serving the first PDU session determines that the RAN cannot activate the second PDU session for the terminal device according to the received notification, the terminal device is not allowed to establish the second PDU session.
Due to the fact that the RAN can activate the second PDU session for the terminal device or the RAN cannot activate the second PDU session for the terminal device due to the reason that the terminal device moves or the network device configuration changes, that is, the RAN does not support dual connectivity from dual connectivity supported, so that the SMF entity serving the first PDU session determines that the second PDU session cannot be activated for the terminal device according to the notification received again, and the SMF entity rejects the request for the terminal device to create the second PDU session.
The terminal device establishes two PDU sessions that are backup to each other, and due to reasons such as terminal device movement or network device configuration change, the RAN supports dual connectivity from dual connectivity to non-dual connectivity, and the SMF entity serving the second PDU session deletes or deactivates the second PDU session, specifically, please refer to the flow shown in fig. 5.
S501, the RAN sends a first notification (notification1) to the AMF entity to indicate that the RAN does not support dual connectivity, wherein the notification1 carries an identifier of a second PDU session.
S502, the AMF entity sends a PDU session update SM context (Nsmf _ PDU _ update _ UpdateSMContext) to the SMF entity 2 serving the second PDU session according to the notification 1.
S503, the SMF entity 2 of the second PDU session served by the slave network device decides to initiate a release procedure or a user plane connection deactivation procedure of the second PDU session based on a local configuration or a policy.
Subsequently, when the RAN supports dual connectivity from non-dual connectivity to dual connectivity due to terminal movement or base station configuration change, the execution flow for all the first PDU sessions is as follows:
s504, the RAN sends a second notification (notification2) to the AMF entity.
S505, the AMF entity sends a PDU session update SM context (Nsmf _ PDU _ update _ UpdateSMContext) to the SMF entity 1 serving the first PDU session according to the notification 2.
S506, SMF entity 1 receives the PDU session update SM context, and sends N1N2message delivery to the AMF entity.
S507, the SMF entity 1 receives the second notification, and if the Context of the second PDU session is found to be absent, initiates a PDU session modification request (PDU session modification request) to the terminal device, and notifies the terminal device to establish the second PDU session.
S508, after receiving the PDU conversation modification request, the terminal equipment initiates a PDU conversation establishing process according to the cause value indication in the prior art.
S509, if the terminal device is able to discover that the second PDU session has been created, for example, the terminal device discovers that the second PDU session has been created according to a Redundancy Sequence Number (RSN) provided by the network device, the terminal device may initiate a service request procedure to activate the second PDU session.
And S510, if the SMF entity 1 receives the second notification and finds that the SMF entity 1 stores the Context of the second PDU session, the SMF entity 1 initiates a PDU session user plane activation process aiming at the second PDU session.
In summary, in the embodiment of the present invention, the RAN may notify a Session Management Function (SMF) entity whether the SMF entity can activate the second PDU Session for the terminal device, so that the SMF entity creates or activates the second PDU Session when determining that the RAN can activate the second PDU Session for the terminal device, so as to improve the reliability of data transmission as effectively as possible. And deleting or deactivating the second PDU session to reduce system overhead if it is determined that the RAN cannot activate the second PDU session for the terminal device. The specific implementation of the SMF creating or activating the second PDU session includes: SMF informs the terminal to initiate a second PDU session creating process or a service request process; or the SMF initiates an activation procedure for the second PDU session. The specific implementation manner of the SMF deleting or deactivating the second PDU session includes: SMF informs the terminal equipment to initiate a second PDU session deletion process; or the SMF initiates a deactivation procedure for the second PDU session.
Referring to fig. 6, based on the same inventive concept, an embodiment of the present invention further provides an SMF entity, which includes a memory 601, a processor 602, and a transceiver 603. The memory 601 and the transceiver 603 may be connected to the processor 602 through a bus interface (fig. 6 is taken as an example), or may be connected to the processor 602 through a dedicated connection line.
The memory 601 may be used to store programs, among other things. The processor 602 may be configured to read the program in the memory 601 and execute the following processes:
receiving a notification message from the RAN, wherein the notification message carries indication information of whether the PDU session can be activated for the terminal equipment or capability information of the base station;
determining that a second PDU session can be activated for the terminal equipment according to the notification message, and creating or activating the second PDU session, wherein the SMF entity serves the first PDU session; or;
and deleting or deactivating the second PDU session according to the notification message when determining that the second PDU session can not be activated for the terminal equipment, wherein the SMF entity serves the second PDU session.
Optionally, the capability information of the base station is information that the RAN supports dual connectivity or does not support dual connectivity.
Optionally, the processor 602 is further configured to:
and in the process of creating the first PDU session, sending an indication message to the RAN, wherein the indication message is used for indicating whether the RAN can activate a second PDU session for the terminal equipment or not.
Optionally, the processor 602 is further configured to:
and if the fact that the second PDU session can be activated for the terminal equipment is determined, sending information carrying the identification ID of the second SMF entity of the second PDU session to an access and mobility management function (AMF) entity, so that the AMF entity selects the second SMF entity for the second PDU session.
Optionally, the processor 602 is further configured to:
and creating a second PDU session for the terminal equipment through the SMF entity stored by the AMF entity.
Optionally, the processor 602 is further configured to:
and if the second PDU session cannot be activated for the terminal equipment according to the re-received notification, rejecting the request of the terminal equipment for creating the second PDU session.
Wherein in fig. 6 the bus architecture may comprise any number of interconnected buses and bridges, with one or more processors, represented in particular by processor 602, and various circuits of memory, represented by memory 601, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 603 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 602 is responsible for managing the bus architecture and general processing, and the memory 601 may store data used by the processor 602 in performing operations.
Alternatively, the Memory 601 may include a Read Only Memory (ROM), a Random Access Memory (RAM), and a disk Memory. The memory 601 is used for storing data required by the processor 602 during operation, that is, storing instructions executable by the at least one processor 602, and the at least one processor 602 executes the method provided by the above-described embodiment of the present invention by executing the instructions stored in the memory 601. The number of the memory 601 is one or more. The memory 601 is also shown in fig. 6, but it should be noted that the memory 601 is not an optional functional module and is therefore shown in fig. 6 by a dotted line.
Referring to fig. 7, based on the same inventive concept, an embodiment of the present invention provides an SMF entity, which includes a receiving unit 701, a first notification unit 702, and a second notification unit 703. The receiving unit 701 is configured to receive a notification message from a radio access network RAN, where the notification message carries indication information indicating whether a second protocol data unit PDU session can be activated for a terminal device or capability information of a base station; the first notification unit 702 is configured to determine, according to the notification message, that a second PDU session can be activated for the terminal device, and then create or activate the second PDU session, where the SMF entity serves the first PDU session; or; the second notification unit 703 is configured to delete or deactivate the second PDU session if it is determined that the second PDU session cannot be activated for the terminal device according to the notification message, where the SMF entity serves the second PDU session.
Optionally, the capability information of the base station is information that the RAN supports dual connectivity or does not support dual connectivity.
Optionally, the first notification unit 702 is further configured to:
and in the process of creating the first PDU session, sending an indication message to the RAN, wherein the indication message is used for indicating whether the RAN can activate a second PDU session for the terminal equipment or not.
Optionally, the first notification unit 702 is further configured to:
and if the fact that the second PDU session can be activated for the terminal equipment is determined, sending information carrying the identification ID of the second SMF entity of the second PDU session to an access and mobility management function (AMF) entity, so that the AMF entity selects the second SMF entity for the second PDU session.
Optionally, the first notification unit 702 is further configured to:
and creating a second PDU session for the terminal equipment through the SMF entity stored by the AMF entity.
Optionally, the receiving unit 701 is further configured to:
and if the second PDU session cannot be activated for the terminal equipment according to the re-received notification, rejecting the request of the terminal equipment for creating the second PDU session.
Therefore, for functions and the like that can be realized by each functional module of the device, reference may be made to the description of the embodiment shown in the present invention, and details are not repeated.
Based on the same inventive concept, an embodiment of the present invention provides a computer-readable storage medium, which stores computer instructions and when the computer instructions are executed on a computer, causes the computer to execute the method shown in the above-mentioned embodiment of the present invention.
The session management method and the SMF entity provided by the embodiment of the invention can be applied to a wireless communication system, such as a 5G system. However, suitable communication systems include, but are not limited to, a 5G system or an Evolved system thereof, other Orthogonal Frequency Division Multiplexing (OFDM) based systems, DFT-S-OFDM (DFT-Spread OFDM) based systems, Evolved Long Term Evolution (lte) based systems, new network equipment systems, and the like. In practical applications, the connection between the above devices may be a wireless connection or a wired connection.
It should be noted that the communication system may include a plurality of terminal devices, and the network device may communicate (transmit signaling or transmit data) with the plurality of terminal devices. The terminal device according to the embodiments of the present invention may be a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. Wireless user equipment, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, for example, portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), a User Device (User Device), and a wireless Device (wireless Device).
The network device provided by the embodiments of the present invention may be a base station or may be configured to interconvert received air frames and IP packets as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include Internet Protocol (IP) network devices. The network device may also be a device that coordinates management of attributes for the air interface. For example, the network device may be a network device in a 5G System, such as a Next generation Base Station (Next generation Node B, gNB), a Base Transceiver Station (BTS) in a Global System for Mobile Communication (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB) in a Wideband Code Division Multiple Access (WCDMA), or an evolved Node B (eNB or e-NodeB) in LTE, which is not limited in the embodiments of the present invention.
It is to be understood that the terms first, second, and the like in the description of the embodiments of the invention are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order. "plurality" in the description of the embodiments of the present invention means two or more.
In some possible embodiments, the session management method and the SMF entity provided by the present invention may also be implemented in the form of a program product, which includes program code for causing a computer device to execute the steps in the session management method according to various exemplary embodiments of the present invention described above in this specification when the program product runs on the computer device, for example, the computer device may execute the session management method provided by the embodiment shown in the embodiment of the present invention.
A program product of a signal processing method for a wireless communication system of an embodiment of the present invention may employ a portable compact disc read only memory (CD-ROM) and include program codes, and may be run on a computing device. However, the program product of the present invention is not limited in this regard and, in the present document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more of the units described above may be embodied in one unit, according to embodiments of the invention. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Moreover, while the operations of the method of the invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
The above embodiments are only used to describe the technical solutions of the present application in detail, but the above embodiments are only used to help understanding the method of the embodiments of the present invention, and should not be construed as limiting the embodiments of the present invention. Variations or substitutions that may be readily apparent to one skilled in the art are intended to be included within the scope of the embodiments of the present invention.

Claims (14)

1. A session management method, comprising:
a Session Management Function (SMF) entity receives a notification message from a Radio Access Network (RAN), wherein the notification message carries indication information of whether a second Protocol Data Unit (PDU) session can be activated for terminal equipment or capability information of a base station, and the capability information of the base station is information that the RAN supports dual connection or does not support dual connection;
the SMF entity establishes or activates the second PDU session if determining that the second PDU session can be activated for the terminal equipment according to the notification message, wherein the SMF entity serves the first PDU session; or;
and the SMF entity deletes or deactivates the second PDU session if determining that the second PDU session cannot be activated for the terminal equipment according to the notification message, wherein the SMF entity serves the second PDU session.
2. The method of claim 1, further comprising:
and the SMF entity sends an indication message to the RAN in the process of creating the first PDU session, wherein the indication message is used for indicating whether the RAN can activate a second PDU session for the terminal equipment or not.
3. The method of claim 1, further comprising:
and if the SMF entity determines that a second PDU session can be activated for the terminal equipment, sending information carrying the identification ID of the second SMF entity of the second PDU session to an access and mobility management function (AMF) entity so that the AMF entity selects the second SMF entity for the second PDU session.
4. The method of claim 3, further comprising:
and establishing the second PDU session for the terminal equipment through the SMF entity stored by the AMF entity.
5. The method of claim 1, wherein after the SMF entity determines that the second PDU session can be activated for the terminal device based on the notification message, and creates or activates the second PDU session, further comprising:
and if the SMF entity determines that the second PDU session cannot be activated for the terminal equipment according to the re-received notification, the SMF entity refuses the request of the terminal equipment for creating the second PDU session.
6. A session management function, SMF, entity, comprising:
a memory to store instructions;
a processor for reading the instructions in the memory, performing the following processes:
receiving a notification message from a Radio Access Network (RAN), wherein the notification message carries indication information of whether a second Protocol Data Unit (PDU) session can be activated for terminal equipment or capability information of a base station, and the capability information of the base station is information that the RAN supports dual connection or does not support dual connection;
if the fact that the second PDU session can be activated for the terminal equipment is determined according to the notification message, the second PDU session is created or activated, wherein the SMF entity serves the first PDU session; or;
determining that the second PDU session cannot be activated for the terminal equipment according to the notification message, and deleting or deactivating the second PDU session, wherein the SMF entity serves the second PDU session;
a transceiver for transmitting information under control of the processor.
7. The SMF entity of claim 6, wherein the processor is further configured to:
and in the process of creating the first PDU session, sending an indication message to the RAN, wherein the indication message is used for indicating whether the RAN can activate a second PDU session for the terminal equipment or not.
8. The SMF entity of claim 6, wherein the processor is further configured to:
and if the fact that the second PDU session can be activated for the terminal equipment is determined, sending information carrying the identification ID of a second SMF entity of the second PDU session to an access and mobility management function (AMF) entity, so that the AMF entity selects the second SMF entity for the second PDU session.
9. The SMF entity of claim 8, wherein the processor is further configured to:
and establishing the second PDU session for the terminal equipment through the SMF entity stored by the AMF entity.
10. The SMF entity of claim 6, wherein the processor is further configured to:
and if the second PDU session cannot be activated for the terminal equipment according to the re-received notification, rejecting the request of the terminal equipment for creating the second PDU session.
11. The SMF entity of claim 7, wherein the SMF entities of the first PDU session and the second PDU session may be the same or different.
12. The SMF entity of claim 7, wherein the transceiver is further configured to:
receiving the notification message from a primary network device if the first PDU session is serviced by a primary RAN node.
13. A session management function, SMF, entity, comprising:
a receiving unit, configured to receive a notification message from a radio access network RAN, where the notification message carries indication information of whether a second protocol data unit PDU session can be activated for a terminal device or capability information of a base station, and the capability information of the base station is information that the RAN supports dual connectivity or does not support dual connectivity;
a first notification unit, configured to establish or activate the second PDU session if it is determined that the second PDU session can be activated for the terminal device according to the notification message, where the SMF entity serves the first PDU session; or;
and a second notification unit, configured to delete or deactivate the second PDU session if it is determined that the second PDU session cannot be activated for the terminal device according to the notification message, where the SMF entity serves the second PDU session.
14. A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-5.
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