UE Access Identity Handling Across 3GPP and Non-3GPP Networks
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Solution Overview
Problem
Existing systems fail to appropriately handle UE access identity when registered to both 3GPP and non-3GPP networks, leading to inappropriate application of Multimedia Priority Service (MPS) and Mission Critical Service (MCS) indicators across different access types.
Innovation Solution
A method is proposed where UE determines access identity as one common parameter when registered to the same network over 3GPP and non-3GPP access, and as two independent parameters when registered to different networks, using indicators like 'Access Identity 1 valid' or 'Access Identity 2 valid' for MPS and MCS, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE applies MPS/MCS indicators from the latest registration procedure over the first access to the second access, then the system maintains simple indicator management, but the priority access assignment becomes incorrect when the UE is registered to different PLMN networks
Solution Approach 1:
The patent segments the access identity management by introducing a new parameter 'lastNon3GPPAccessIdentity' separate from 'last3GPPAccessIdentity'. This segmentation allows independent tracking of access identities for 3GPP and non-3GPP accesses, ensuring that indicators from one access type do not incorrectly apply to another access type when the UE is registered to different PLMN networks.
2Reliability
If the UE handles access identity as independent parameters for different accesses, then the priority access assignment becomes accurate, but the system complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism by adding the 'lastNon3GPPAccessIdentity' parameter as a mediator between the 3GPP and non-3GPP access identity management systems. This intermediary parameter enables the UE to correctly determine which access identity to apply when transitioning between different access types, reducing the need for complex conditional logic while maintaining accuracy.
3Reliability
If the system reserves network capacity for MPS usage, then priority access is guaranteed for MPS users, but service availability for regular users decreases
Solution Approach 1:
The patent implements dynamic access identity management where the UE can switch between different access identities (last3GPPAccessIdentity and lastNon3GPPAccessIdentity) based on the current access type and PLMN registration status. This dynamic approach allows the system to flexibly allocate priority access resources, ensuring that MPS users receive guaranteed priority access when needed while minimizing the impact on regular users by only reserving capacity when actually required.
Data Source
AI summary
A method of determining UE access identity for a UE that is registered to the same or different PLMN networks over 3GPP and non-3GPP accesses is proposed. The UE registers to one or more Public Land Mobile Network (PLMN) or Standalone Non-Public Network (SNPN) over 3GPP access and non-3GPP access. If the UE registers to the same PLMN/SNPN over 3GPP and non-3GPP access, then the UE handles the UE access identity as one common parameters. On the other hand, if the UE registers to different PLMN/SNPN over 3GPP and non-3GPP, then the UE handles the UE access identity as two independent parameters. The access identity may comprise a priority indicator IE that is set to “Access Identity 1 valid” for MPS or “Access Identity 2 valid” for MCS.