Resolving Paging Collisions in Multi-SIM C-RAT Operations
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Solution Overview
Problem
In wireless communication systems, particularly in multi-SIM and C-RAT operations, paging collisions occur when a UE is camped on multiple cells, leading to conflicts in configured paging occasions, which can result in the UE being able to receive paging signals from only one cell at a time.
Innovation Solution
The proposed solution involves detecting paging collisions by a UE or network entity, signaling the conflict to relevant cells, and receiving or broadcasting new paging configurations to resolve the conflicts. This includes the UE signaling an indication of the conflict, receiving information for a new paging configuration, and potentially camping on a different cell to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE is camped on multiple cells to improve service coverage and connectivity, then the UE can maintain communication with multiple networks, but paging collisions occur between cells causing the UE to miss paging signals
Solution Approach 1:
The network performs preliminary actions by calculating and determining non-conflicting paging occasions for each cell before the UE actually camps on them. The network identifies suitable paging frames and occasions that avoid collisions, and prepares paging configuration information in advance so that when the UE camps on multiple cells, paging signals can be reliably delivered without conflict.
Solution Approach 2:
The system implements feedback mechanisms where the network monitors paging collision situations and adjusts paging configurations accordingly. When collisions are detected or predicted, the network can modify paging occasions and frames to eliminate conflicts, ensuring continuous reliable paging delivery across multiple cells the UE is camped on.
2Ease of manufacture
If paging occasions are configured for each cell independently to simplify network configuration, then each cell can manage its own paging resources, but conflicts arise when multiple cells have paging occasions at the same time
Solution Approach 1:
The network acts as an intermediary that coordinates paging configurations across multiple cells. Rather than allowing completely independent cell-level configuration, the network maintains overall control to allocate paging resources in a way that prevents collisions, balancing configuration simplicity with conflict avoidance.
Solution Approach 2:
The system dynamically changes paging parameters such as paging frames, paging occasions, and periodicity to resolve conflicts. When collisions are detected, the network adjusts these parameters for specific cells or UEs to eliminate overlapping paging occasions while maintaining efficient paging delivery.
3Reliability
If the UE monitors paging on all camped cells simultaneously to ensure no paging is missed, then complete paging coverage is achieved, but the UE cannot receive paging from multiple cells at the same time due to hardware limitations
Solution Approach 1:
The network performs preliminary calculation of non-conflicting paging occasions before the UE needs to receive paging. By determining in advance which paging frames and occasions will not collide for each cell, the network ensures that the UE can successfully receive paging signals on all camped cells using its limited reception capability, achieving complete paging coverage without requiring the UE to simultaneously receive overlapping paging signals.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for resolving paging collisions, for example, for a UE camped on multiple cells. In some cases, a UE detects, based on paging configurations, a conflict between configured paging occasions of at least two cells on which the UE is camped, signals an indication of the conflict to at least one of the cells, and receives information regarding a new paging configuration designed to resolve the conflict. In some cases, a UE identifies a different cell to camp on that is not subject to the conflict, wherein the different cell is not as good a candidate for cell selection as one of the conflicting cells in terms of cell selection criteria, and camps on the identified cell.