Conditional Carrier Aggregation for Reduced Interruption in Moving Networks
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Solution Overview
Problem
Current mobile communication systems face challenges in minimizing service interruption time during handovers between cells, particularly in non-terrestrial networks where timing advance pre-compensation and location-based triggers are crucial due to larger propagation delays and satellite movement.
Innovation Solution
Implementing conditional carrier aggregation (CA) with triggering conditions based on time, timing advance, location, and signal level thresholds to facilitate faster activation and seamless handover between cells, while maintaining connections and optimizing channel quality indicator (CQI) reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional handover procedures are used in non-terrestrial networks, then connection switching between cells is performed, but service interruption time increases due to larger propagation delays and satellite movement
Solution Approach 1:
The patent applies preliminary action by establishing a connection with the target cell before releasing the source cell connection. The WTRU is configured to start a connection towards a target cell based on triggering conditions (time, location, timing advance, signal level) before the handover is complete, ensuring seamless transition and minimizing service interruption time in non-terrestrial networks with large propagation delays
Solution Approach 2:
The patent implements dynamics by making the handover process adaptive through monitoring multiple triggering conditions (time conditions, location conditions, timing advance conditions, signal level thresholds). The connection transition is dynamically controlled based on real-time evaluation of these conditions, allowing flexible optimization of handover timing to minimize interruption while maintaining reliability
2Speed
If faster activation of target cell is implemented with frequent CQI reporting, then handover speed increases, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting CQI reporting frequency based on handover phase and triggering conditions. During target cell activation, the WTRU is configured to report CQI more frequently to enable faster path selection and optimization, but this increased reporting burden is temporary and condition-based, reducing overall device complexity compared to continuous high-frequency reporting
Solution Approach 2:
The patent implements self-service by enabling the WTRU to autonomously monitor triggering conditions and initiate faster CQI reporting towards the target cell when conditions are met. The device automatically manages the increased signaling load only when necessary for handover activation, without requiring continuous network control, thereby balancing speed improvement with acceptable complexity
Data Source
AI summary
Systems, methods, and instrumentalities are disclosed herein associated with receiving a triggering configuration for starting and/or stopping a dual connection with a cell (e.g., second cell), where the triggering configuration may be the same or different for the uplink (UL) and downlink (DL). A configuration may be received regarding the WTRU UL behavior for faster activation of the target cell (e.g. faster channel quality indicator (CQI) reporting prior to starting the connection towards the second cell), which may include triggering conditions for starting the UL signaling. The triggering conditions may be monitored for starting the UL signaling towards/regarding the second cell for faster activation. In examples the triggering conditions may be monitored for starting the connection towards the second cell.