UE Receive Timing Difference Reporting for FR2 Carrier Aggregation
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Solution Overview
Problem
Current technologies face challenges in mitigating performance degradation in User Equipment (UE) due to large Receive Timing Differences (RTD) in Frequency Range 2 (FR2) inter-band Carrier Aggregation, leading to potential throughput losses and increased network complexity.
Innovation Solution
The UE determines the receive timing difference between a serving cell and a target cell and reports an indication to the network, allowing the network to assess the target cell's availability and adjust configurations to prevent performance degradation, thereby improving throughput and reducing network complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network configures FR2 inter-band CA with large RTD, then carrier aggregation capability is improved, but performance degradation occurs due to timing synchronization issues
Solution Approach 1:
The UE measures and reports the receive timing difference before the network configures the target cell. This preliminary measurement allows the network to anticipate timing issues and configure appropriate timing advance values or adjust scheduling parameters in advance, preventing performance degradation before it occurs.
Solution Approach 2:
The UE provides feedback about the measured receive timing difference to the network. This feedback mechanism enables the network to make informed decisions about cell configuration, timing advance adjustments, and resource allocation, ensuring optimal performance for inter-band CA with large RTD.
2Reliability
If the network implements complex RTD measurement and reporting mechanisms, then performance degradation is mitigated, but network complexity increases
Solution Approach 1:
The UE autonomously measures the receive timing difference between serving and target cells and determines whether reporting is needed based on predefined thresholds. This self-service approach reduces network complexity by eliminating the need for centralized timing measurement and decision-making, while still achieving performance degradation mitigation.
Solution Approach 2:
The system changes the parameter being monitored from complex signal quality metrics to a simpler timing difference parameter. This parameter change simplifies the measurement and reporting process while effectively identifying cells that may cause performance degradation due to large RTD.
3Device complexity
If the UE operates with common beam management in FR2 inter-band CA, then beam management complexity is reduced, but receive timing difference tolerance is limited to 3 μs
Solution Approach 1:
The UE performs preliminary timing difference measurements and reports them to the network before cell configuration. This allows the network to configure timing advance values that compensate for large RTD, enabling common beam management to work effectively with timing differences exceeding the 3 μs limit.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of mitigation of performance degradation for improved system performance. The method comprises determining receive timing difference between a serving cell of the first device and a target cell, the serving cell being located on a first carrier, the target cell being located in a second carrier; and determining to report an indication associated with the receive timing difference to the second device. In this way, the network may be aware of experience performance degradation of the UE due to a large RTD without increasing the network complexity. Meanwhile, the TP performance of the UE may be improved.