PDU Session Establishment via Access Type Indication
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Solution Overview
Problem
Current methods for switching from an EPS to a 5GS network result in increased latency due to the lack of registration and PDU session establishment via non-3GPP access networks, leading to access failures and inefficient switching between 3GPP and non-3GPP access types.
Innovation Solution
A method and apparatus for PDU session establishment that determines and utilizes the access type supported by the PDN connection to register and establish PDU sessions in the 5GS network, allowing seamless switching between 3GPP and non-3GPP access networks, reducing latency and access failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs registration and PDU session establishment procedures after moving to a 3GPP access network, then the access failure probability is reduced, but the latency for UE to access the 5GS increases
Solution Approach 1:
The patent applies preliminary action by having the UE perform registration and PDU session establishment procedures in advance via non-3GPP access networks before actually needing to access the 5GS. The UE stores the access type information (3GPP or non-3GPP) during the PDN connection establishment phase, so when switching to 5GS, the UE can immediately use the pre-stored access type to complete registration and session establishment without delay, thus reducing latency while maintaining access success probability.
2Device complexity
If the UE does not initiate registration or PDU session establishment via non-3GPP access network, then the procedure complexity is reduced, but the access failure probability increases when switching from EPS to 5GS
Solution Approach 1:
The patent applies self-service by having the UE automatically determine and use the appropriate access type (3GPP or non-3GPP) based on pre-stored information during PDN connection establishment. The UE autonomously selects the correct access network type without requiring complex manual configuration or network intervention, simplifying the procedure while ensuring reliable access to 5GS by matching the stored access type with the current network conditions.
3Adaptability or versatility
If the UE switches from PDN connection in EPS to PDU session in 5GS without utilizing access type information, then the switching flexibility is reduced, but the access failure probability increases
Solution Approach 1:
The patent applies parameter changes by utilizing the access type parameter (3GPP or non-3GPP) as a key identifier to determine the appropriate access network for 5GS registration and PDU session establishment. The UE stores this access type parameter during PDN connection establishment and uses it to select the matching access network when switching to 5GS, enabling flexible adaptation to different network conditions while ensuring access success by matching parameters between EPS and 5GS environments.
Data Source
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AI summary
This application discloses a PDU session establishment method and apparatus. The method includes: receiving, by a terminal device in a process of establishing a PDN connection in a first system, an access type that is sent by a core network device and that corresponds to the PDN connection in a second system; and when the terminal device moves to the second system, establishing, by the terminal device, a PDU session in the second system via an access network indicated by the access type, where the PDU session is associated with the PDN connection. Implementation of the present invention can increase a success rate of establishing a PDU session.