UE Bulk PDU Session Release via Single NAS Message
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G network technologies lack an efficient mechanism for bulk release of Packet Data Unit (PDU) sessions across multiple Data Network Names (DNNs) or Single Network Slice Assisted Information (S-NSSAI), requiring individual session releases which can lead to unsynchronized PDU states and increased signaling complexity.
Innovation Solution
Implementing a mechanism that allows a User Equipment (UE) to send a single Non-Access-Stratum (NAS) message for bulk PDU session release across multiple DNNs or S-NSSAIs, enabling simultaneous termination of multiple PDU sessions associated with a DNN or S-NSSAI, and supporting this capability through negotiation with the control entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual PDU session release messages are sent for each session, then each session can be released independently, but the number of messages increases and signaling complexity increases
Solution Approach 1:
The patent combines multiple individual PDU session release messages into a single bulk release message. The UE sends one NAS message containing a list of PDU session IDs to be released, and the network responds with a single acknowledgment. This merging approach reduces signaling complexity while maintaining reliable release of all specified sessions through atomic transaction handling.
Solution Approach 2:
The bulk PDU session release message serves multiple functions simultaneously: it releases multiple PDU sessions, provides atomic transaction control, and reduces signaling overhead. The single message structure can handle any number of PDU session releases in one operation, making the mechanism universally applicable regardless of the number of sessions to be released.
2Reliability
If individual PDU session release messages are sent for each session, then each session can be released independently, but the number of messages required increases
Solution Approach 1:
Multiple individual release messages are merged into a single bulk release message. Instead of sending N separate messages for N PDU sessions, the UE sends one consolidated message containing all PDU session IDs to be released, reducing the message quantity from N to 1.
Solution Approach 2:
The UE prepares a comprehensive list of all PDU session IDs to be released in advance and includes them in a single message. This preliminary organization of release targets allows the network to process all releases in one atomic operation, eliminating the need for multiple sequential message exchanges.
3Ease of operation
If individual PDU session release messages are sent for each session, then session-specific control is maintained, but unsynchronized PDU states may occur
Solution Approach 1:
The UE determines in advance which PDU sessions should be released and includes all selected session IDs in the bulk release message. This preliminary selection ensures that all sessions are released together in a synchronized manner, preventing intermediate states where some sessions are released while others remain active.
Solution Approach 2:
The network provides feedback through a single acknowledgment message confirming the bulk release operation. This feedback mechanism ensures that the UE receives unified confirmation that all specified PDU sessions have been released, maintaining state synchronization between the UE and network.
Data Source
AI summary
Methods and apparatus for bulk PDU session release between a wireless device and a control plane entity in a wireless system such as for example a 5G core network or similar is provided. The method comprises the wireless device determines that two or more Packet Data Unit, PDU, sessions established within the wireless system that are associated to at least one Data network identified by a Data Network Name, DNN, or to at least one Single Network Slice Assisted Information, S-NSSAI, should be released and transmits to a control entity of a core network, a Non-Access-Stratum, NAS, message indicating one of the at least one DNN or the at least one S-NSSAI for which the corresponding PDU sessions should be released all at once with a single message.