Monitoring CORESETs During Make-Before-Break Handover
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Solution Overview
Problem
Current wireless communication systems, particularly in multi-cell scenarios, face challenges in efficiently monitoring downlink control information (DCI) during make-before-break handover procedures, where user equipment (UE) needs to maintain connectivity with both source and target cells, leading to overlapping PDCCH occasions and limitations in monitoring multiple control resource sets (CORESETs).
Innovation Solution
The system configures the UE to determine and monitor a specific number of CORESETs in both the source and target cells, using priority rules and dropping rules to manage overlapping monitoring occasions, ensuring effective monitoring of PDCCH transmissions while adhering to the UE's capabilities, such as supporting only three active CORESETs per BWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors multiple CORESETs in both source and target cells during handover, then the reliability of connection maintenance is improved, but the device complexity increases due to overlapping PDCCH occasions and monitoring limitations
Solution Approach 1:
The patent segments the monitoring task by dividing CORESETs into different groups (first set and second set) with different monitoring priorities. The UE monitors a first number of CORESETs in the source cell and a second number of CORESETs in the target cell simultaneously, with each set having specific monitoring occasions. This segmentation allows the UE to manage multiple CORESETs without overwhelming complexity by organizing them into structured groups with defined monitoring rules.
Solution Approach 2:
The patent applies partial action by limiting the number of CORESETs to be monitored in each cell during handover. Instead of monitoring all possible CORESETs, the UE monitors a first number of CORESETs in the source cell and a second number of CORESETs in the target cell, where these numbers are constrained by UE capabilities and configuration. This partial monitoring approach maintains reliability for critical handover functions while reducing overall monitoring complexity.
2Loss of information
If the UE monitors overlapping PDCCH occasions in different CORESETs, then the completeness of control information reception is improved, but the loss of time increases due to beam switching requirements
Solution Approach 1:
The patent implements preliminary action by pre-configuring the UE with information about which CORESETs to monitor and their respective monitoring occasions before handover occurs. The network entity provides configuration indicating a first number of CORESETs in the source cell and a second number of CORESETs in the target cell to monitor during handover. This advance configuration allows the UE to prepare monitoring resources in advance, reducing the need for rapid beam switching during actual PDCCH reception and minimizing time loss.
Solution Approach 2:
The patent applies local quality by assigning different monitoring characteristics to different CORESETs based on their specific requirements. Each CORESET can have its own monitoring occasion, periodicity, and beam configuration tailored to its function. This allows the UE to optimize monitoring for each individual CORESET rather than using a uniform approach, thereby reducing unnecessary beam switching while ensuring complete control information reception.
3Productivity
If the UE is configured to support multiple beams simultaneously, then the productivity of handover execution is improved, but the device complexity increases due to additional hardware requirements
Solution Approach 1:
The patent implements dynamics by making beam configuration adaptive rather than static. The UE is configured to support a first number of beams for monitoring the first set of CORESETs in the source cell and a second number of beams for monitoring the second set of CORESETs in the target cell. The beam configuration can be dynamically adjusted based on handover progress and UE capability, allowing efficient handover execution without requiring the UE to permanently support a large number of simultaneous beams, thus avoiding excessive device complexity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for configuring monitoring of downlink control information (DCI) for a source cell and a target cell during make-before-break (MBB) handover.