UE EMM Parameter Handling for 3GPP Non-3GPP Access Types
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Solution Overview
Problem
Current systems fail to properly handle EPS mobility management parameters when a UE receives a de-registration request message via non-3GPP access, leading to incomplete or incorrect handling of EMM parameters, especially when the message is received over non-3GPP access.
Innovation Solution
A method where the UE determines the access type in the de-registration request message and handles EMM parameters accordingly, performing local releases of PDU sessions and managing EMM parameters based on the access type and 5GMM cause value, ensuring correct de-registration procedures for 3GPP and non-3GPP access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE handles EMM parameters based on the access type in the de-registration request message, then the handling accuracy of EMM parameters is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by making the EMM parameter handling specific to the access type. The UE checks the access type field in the de-registration request message and applies different handling rules for 3GPP access versus non-3GPP access. This ensures that EMM parameters are handled with the appropriate precision for each access type without unnecessarily complicating the handling for all cases.
Solution Approach 2:
The patent uses preliminary action by having the UE examine the access type field in the de-registration request message before proceeding with EMM parameter handling. This preliminary check allows the UE to determine the appropriate handling path in advance, improving accuracy while avoiding the complexity of multiple simultaneous handling mechanisms.
2Stability of the object's composition
If the UE releases PDU sessions over both 3GPP and non-3GPP access when receiving de-registration request via non-3GPP access, then the consistency of de-registration procedure is improved, but the loss of information increases
Solution Approach 1:
The patent applies local quality by making the PDU session release specific to the access type indicated in the de-registration request message. When the access type indicates 3GPP access, only PDU sessions over 3GPP access are released. When it indicates non-3GPP access, only PDU sessions over non-3GPP access are released. This prevents unnecessary release of sessions on the other access type, maintaining consistency while avoiding information loss.
Solution Approach 2:
The patent uses partial action by releasing only the necessary PDU sessions based on the access type in the de-registration request message, rather than releasing all PDU sessions regardless of access type. This partial release approach maintains procedural consistency for the indicated access while preserving sessions on other accesses, thereby preventing unnecessary information loss.
3Reliability
If the UE handles EMM parameters when receiving de-registration request over 3GPP access for non-3GPP access, then the completeness of parameter handling is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by making the EMM parameter handling specific to the match between the received access type and the indicated access type. The UE checks whether the access type in the de-registration request message matches the access type over which the message was received. EMM parameters are handled only when there is a match, ensuring completeness without unnecessary complexity for mismatched cases.
Data Source
AI summary
A method of handling de-registration and EPS mobility management (EMM) parameter for 3GPP when UE receives a de-registration request message via non-3GPP is proposed. There is an access type in the de-registration type IE in the de-registration request message. In one novel aspect, a UE handles EMM parameters of the de-registration procedure depending on the received access type in the de-registration type IE. Upon receiving a DEREGISTRATION REQUEST message, if the de-registration request is for 3GPP access or for 3GPP access and non-3GPP access, the UE performs a local release of the PDU sessions over 3GPP access and non-3GPP access, if any. Based on the 5GMM cause, UE also handles the corresponding EMM parameters including EMM state, EPS update status, 4G-GUTI, last visited registered TAI, TAI list, eKSI and attach attempt counter.