PDU Session Deregistration With Automatic Reactivation Signaling
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Solution Overview
Problem
Existing systems lack a method for the Unified Data Management (UDM) or Unified Data Repository (UDR) to initiate the reactivation of a Protocol Data Unit (PDU) session following deregistration due to administrative changes in a wireless device's subscription, such as a change in payment plans, without triggering the Session Management Function (SMF) to perform the necessary deregistration and reactivation.
Innovation Solution
A method and apparatus are provided to enable the UDM and UDR to trigger the deregistration of a PDU session with a reactivation requirement, using commands and flag changes to indicate the need for reactivation, ensuring that the Session Management Function (SMF) is informed to perform the necessary deregistration and subsequent reactivation of the PDU session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UDM or UDR initiates deregistration of a PDU session due to administrative reasons (e.g., subscription change), then the deregistration is performed, but the PDU session cannot be reactivated because there is no procedure for reactivation
Solution Approach 1:
The patent applies preliminary action by including a reactivation indication flag in the deregistration notification message sent from UDM to SMF. This flag is set in advance to trigger automatic reactivation procedures. When the SMF receives the deregistration notification with the reactivation indication, it automatically initiates reactivation of the PDU session without requiring a separate manual procedure, thus enabling reactivation capability while maintaining procedural simplicity.
2Adaptability or versatility
If a separate reactivation procedure is implemented, then PDU session reactivation is enabled, but the system complexity increases
Solution Approach 1:
The patent merges the reactivation indication with the existing deregistration notification message. Instead of creating a separate reactivation procedure or message, the reactivation indication is combined into the deregistration notification that is already being sent from UDM to SMF. This approach enables reactivation capability while avoiding additional operational steps, maintaining ease of operation by utilizing the existing message flow.
3Adaptability or versatility
If the UDR is configured to indicate reactivation need, then reactivation can be triggered, but the existing UDR structure must be modified
Solution Approach 1:
The patent applies parameter changes by introducing a reactivation indication flag as a new parameter in the deregistration notification message. This flag can be set by the UDM based on subscription change information received from UDR. The existing UDR structure is utilized without major modifications, and the reactivation indication is conveyed through the existing Nudm_UECM_DeregistrationNotification message interface, thus enabling reactivation indication while minimizing configuration complexity.
Data Source
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AI summary
Disclosed herein is a method 300 performed by an UDM 104. The method comprises: obtaining s302 a command for triggering deregistration of a network session associated with a SMF, and a UE, wherein the command indicates that reactivation of the network session is required; and after obtaining the command, transmitting s304 towards the SMF a deregistration notification request for triggering the SMF to perform the deregistration of the network session, wherein the deregistration notification request indicates that the network session being deregistered is requested to be reactivated.