CSI-RS L1 Measurement for Low-Latency Triggered Mobility
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Solution Overview
Problem
Existing wireless communication systems face challenges in handover procedures due to high latency and low reliability caused by relying on SSB-based measurements, which do not utilize refined CSI-RS beams, leading to longer RRC reconfigurations and increased interruption times.
Innovation Solution
Implementing CSI-RS-based L1 measurement for L1/L2 triggered mobility (LTM) to enable the use of refined beams during handovers, reducing the need for additional RRC reconfigurations and enhancing beam refinement post-switch, thereby improving reliability and lowering latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSB-based measurements are used for handover procedures, then measurement coverage is provided, but handover latency is high and reliability is low
Solution Approach 1:
The patent changes the measurement parameter from SSB (Synchronization Signal Block) to CSI-RS (Channel State Information Reference Signal). This parameter change enables refined beam measurements with better resolution and accuracy, directly improving handover reliability while reducing latency through more precise channel state information.
Solution Approach 2:
The patent implements preliminary CSI-RS beam measurements and reporting configurations before handover is triggered. By pre-configuring measurement resources and criteria, the system prepares measurement data in advance, reducing the time required during actual handover execution and improving overall reliability.
2Manufacturing precision
If SSB-based measurements are used, then basic handover functionality is maintained, but refined beam adaptation is not achieved
Solution Approach 1:
The patent transitions from SSB to CSI-RS measurements, enabling refined beam adaptation. CSI-RS provides more granular channel state information that allows precise beamforming adjustments, achieving higher manufacturing precision in beam alignment while managing complexity through standardized procedures.
Solution Approach 2:
The patent introduces CSI-RS as an intermediary measurement signal between the physical layer synchronization signals and the higher-layer handover decisions. This intermediary provides detailed channel state information that enables refined beam adaptation without directly increasing end-to-end system complexity.
3Measurement precision
If additional RRC reconfigurations are performed for beam refinement, then measurement accuracy improves, but handover interruption time increases
Solution Approach 1:
The patent performs preliminary CSI-RS measurements and configurations before handover execution. By preparing measurement data and beam refinement parameters in advance, the system achieves high measurement precision without requiring additional RRC reconfigurations during the handover process, thus reducing interruption time.
Solution Approach 2:
The patent maintains continuous CSI-RS measurement processes throughout the handover procedure. Instead of interrupting measurements for RRC reconfigurations, the system continuously monitors channel state information, ensuring measurement precision is maintained while minimizing handover interruption duration.
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AI summary
Systems (100), methods, and apparatuses (105) are disclosed for channel state information reference signal, CSI-RS,-based L1 measurement for L1/L2 triggered mobility, LTM. In one or more examples, the systems (100), apparatuses (105), and methods include receiving, from a candidate cell by a user equipment, UE,, a CSI-RS; implementing LTM based on identifying a trigger condition, the trigger condition being based on a message received from a serving cell; performing a CSI measurement for the candidate cell; switching to the candidate cell based on the CSI measurement and on receiving a cell switch command from the serving cell; and transmitting a measurement report to the candidate cell based on the CSI measurement and based on switching to the candidate cell.