Paging Early Indication Handling for Emergency Session Handovers
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing paging indications, particularly during emergency PDU session handovers and transfers between different access technologies in 5G systems.
Innovation Solution
The proposed solution involves disabling Paging Early Indication Paging Subgroup (PEIPS) assistance information during emergency PDU sessions handover to 3GPPA and enabling it during handovers to N3GPPA or after the emergency PDU session is released or successfully transferred to an Evolved Packet Core (EPC) or an evolved packet data gateway (ePDG).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PEIPS assistance information is continuously used during emergency PDU session handovers, then paging indication efficiency is maintained, but compatibility and reliability deteriorate when handovering between different access technologies (3GPPA and N3GPPA)
Solution Approach 1:
The patent implements dynamic switching of PEIPS assistance information usage based on access technology type and session state. The system transitions from static continuous usage to dynamic conditional usage, enabling adaptability across different access technologies while maintaining reliability when appropriate. This resolves the contradiction by making the system flexible rather than rigid.
Solution Approach 2:
The patent changes the operational parameters of PEIPS assistance information based on handover conditions. When handovering to 3GPPA during emergency sessions, the system disables PEIPS usage, while enabling it for N3GPPA handovers or after session release/transfer. This parameter switching resolves the contradiction by adapting the system behavior to specific technical contexts.
2Adaptability or versatility
If PEIPS assistance information is disabled during emergency PDU session handover to 3GPPA, then access technology adaptability is improved, but paging indication efficiency deteriorates
Solution Approach 1:
The patent applies local quality by treating different access technologies and session states differently regarding PEIPS usage. Instead of a uniform approach, the system selectively enables or disables PEIPS based on the specific handover context (3GPPA vs. N3GPPA, emergency session state), optimizing both adaptability and efficiency locally for each scenario.
Solution Approach 2:
The system dynamically adjusts PEIPS usage based on real-time conditions. When handovering to 3GPPA during emergency sessions, PEIPS is disabled to ensure compatibility, but can be re-enabled after session release or transfer to EPC/ePDG. This dynamic adaptation resolves the contradiction by balancing adaptability requirements with efficiency optimization.
3Productivity
If PEIPS assistance information is enabled after emergency PDU session release or transfer to EPC/ePDG, then paging indication efficiency is improved, but system complexity increases due to multiple state management conditions
Solution Approach 1:
The patent implements feedback mechanisms where the system monitors session state changes (release, transfer to EPC/ePDG) and automatically adjusts PEIPS usage accordingly. This feedback-driven approach manages the complexity by using clear state transitions as triggers, making the control logic more systematic and manageable despite multiple conditions.
Solution Approach 2:
The system performs preliminary actions by pre-defining the PEIPS usage state based on anticipated session outcomes. When an emergency PDU session is released or transferred, the system proactively enables PEIPS assistance information in preparation for subsequent paging operations, rather than waiting for paging events to occur. This reduces operational complexity by establishing the correct state in advance.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a UE in a wireless network, comprising performing a registration procedure indicating support of a first paging subgrouping; receiving, from an AMF, a negotiated PEIPS assistance information in a registration accept message during registration procedure; using a PEIPS assistance information; establishing an emergency PDU session over a first access network; stopping to use PEIPS assistance information; performing handover procedure of the emergency PDU session from first access network to a second access network; and in case that emergency PDU session is handed over from first access network to second access network, using PEIPS assistance information.