SCell Activation Delay Reduction in High-Speed UE Carrier Aggregation
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Solution Overview
Problem
In high-speed mode, the activation delay of serving cells in 5G user equipment (UE) impacts mobility performance due to the need for extensive measurements and signaling, which can be prolonged, especially when traveling at speeds exceeding 50 Kph.
Innovation Solution
The solution involves reducing the number of component carriers, reusing measurements for intra-band and collocated serving cells, and implementing direct activation through RRC configuration or handover, allowing for quicker SCell activation by leveraging existing measurements and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive measurements and signaling are performed for SCell activation, then measurement precision and reliability are improved, but activation delay increases
Solution Approach 1:
The UE performs measurements on candidate SCells in advance and reports measurement results to the network before actual activation is needed. This preliminary measurement action allows the network to have measurement results ready when activation is commanded, eliminating the need for time-consuming measurements during the activation process itself.
Solution Approach 2:
The patent implements a mechanism where measurement results are buffered and prepared beforehand. The UE maintains measurement information for candidate cells in advance, cushioning against the time delay that would otherwise occur during activation by having measurement data readily available when needed.
2Productivity
If the number of component carriers is increased for carrier aggregation, then data transmission speed is improved, but activation delay and complexity increase
Solution Approach 1:
The UE performs measurements on multiple candidate SCells across different component carriers in advance and reports these measurements to the network. This allows the network to quickly select and activate appropriate SCells from the pre-measured candidates without requiring time-consuming measurements at activation time, thus enabling multi-carrier aggregation with reduced delay.
Solution Approach 2:
The UE performs measurements on a larger set of candidate SCells than immediately needed for activation. By measuring more cells in advance than the minimum required, the system ensures that when activation is commanded, suitable SCells are already measured and ready, reducing activation delay while supporting multiple component carriers for high data transmission speed.
3Reliability
If extensive signaling is performed for SCell activation, then reliability is improved, but activation delay increases
Solution Approach 1:
The UE reports measurement results to the network in advance before activation is commanded. This preliminary signaling of measurement information allows the network to have all necessary information ready for rapid activation decision-making, maintaining reliable activation while reducing the signaling time required at the moment of activation.
4Measurement precision
If measurements are performed for each serving cell independently, then measurement precision is improved, but device complexity and activation delay increase
Solution Approach 1:
The patent merges the measurement process across multiple serving cells. The UE performs measurements on candidate SCells and reports these measurements to the network, allowing the network to make activation decisions based on consolidated measurement data. This merging approach maintains measurement precision while reducing the complexity of independent per-cell measurement management and reducing overall activation delay.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide SCell activation. In one example, a UE may support carrier aggregation in a high speed mode, such FR1 CA in HST. Serving cells can be particularly configured for the carrier aggregation based on the UE's capability to support carrier aggregation in the high speed mode. Additionally or alternatively, an SCell activation procedure can be performed based on this capability.