Multi-USIM UE Paging Collision Avoidance via Segmented Monitoring
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Solution Overview
Problem
Multi-USIM UEs face collisions during simultaneous AS procedures due to overlapping monitoring occasions and transmission opportunities, leading to delayed or failed SI Acquisition and Paging procedures, which can result in increased latency, selection of suboptimal cells, and missed Mobile Terminated calls.
Innovation Solution
The UE adapts its configuration to avoid collisions by using methods such as PO skipping, extended PDCCH monitoring occasions, and dynamic RRC connection management, allowing it to alternate or suspend monitoring occasions and transmission opportunities between USIMs, and requests network modifications to optimize paging configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors paging occasions for multiple USIMs simultaneously, then the UE can receive paging messages from both networks, but monitoring occasions and transmission opportunities overlap causing collisions
Solution Approach 1:
The UE segments the monitoring occasions for different USIMs into separate time resources. The patent implements this by determining collision patterns between paging occasions of multiple USIMs and selectively monitoring only non-colliding occasions, thereby dividing the monitoring task across distinct time segments to avoid interference.
Solution Approach 2:
The UE dynamically adjusts its monitoring behavior based on detected collision patterns. The patent employs dynamic switching between monitoring and skipping paging occasions depending on whether collisions are detected, allowing the system to adapt its resource allocation in real-time to avoid harmful interactions.
2Object-generated harmful factors
If the UE skips paging occasions to avoid collisions, then collision-free monitoring is achieved, but paging message reception may be missed
Solution Approach 1:
The UE implements feedback mechanisms by monitoring for collision patterns and adjusting its paging occasion selection accordingly. The system uses feedback from detected collisions to dynamically modify which paging occasions are monitored, ensuring that reliable paging reception occurs only in collision-free time slots while maintaining overall reception reliability.
3Loss of information
If the UE acquires system information for multiple USIMs simultaneously, then complete network information is obtained, but acquisition time increases due to collisions
Solution Approach 1:
The UE segments the system information acquisition process for multiple USIMs into separate time intervals. By identifying and avoiding time slots where SI acquisition occasions collide between USIMs, the UE sequentially acquires system information without interference, ensuring completeness while minimizing total acquisition time through optimized scheduling.
Data Source
AI summary
A radio apparatus communicating with a first and a second network, and having a first connection to the first network, may receive a page from the second network and determine to form a second connection with the second network, and notify the first network of the selection. The first network may then notify the apparatus to release or suspend the first connection. The apparatus may send release and/or suspension preferences to the first network, such as a preference to be treated in an idle or inactive mode, paging preferences, and a preferred identifier of the apparatus. The apparatus may then form the second connection, and monitor for paging from the first network, e.g., during a given paging occasion and paging frame.