Closed-Loop Power Control Reset for NR Beam Switching Stability
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Solution Overview
Problem
In the context of New Radio (NR) technology, the sudden drop in transmission power due to the accumulation of large negative values in closed-loop power control when a new beam takes effect while the old beam's path loss is still used is not effectively addressed by existing solutions.
Innovation Solution
A method and device for resetting relevant parameters of closed-loop power control after the updated PL-RS parameter or beam state information takes effect, utilizing RRC, MAC CE, or physical layer signaling to determine the closed-loop power control index based on the activated PL-RS or beam state parameters, and replacing old PL-RS parameters with new ones to prevent power drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the PL of the old beam is used during the process where a new beam takes effect, then the beam switching is smooth and continuous, but the closed-loop power control accumulates a large negative value causing transmission power to drop suddenly
Solution Approach 1:
The patent applies preliminary action by resetting the closed-loop power control parameters in advance when PL-RS parameter updates are triggered, before the actual beam switching completes. This proactive reset prevents the accumulation of negative values that would otherwise occur during the beam transition period, ensuring power stability without disrupting beam switching continuity.
2Adaptability or versatility
If the PL-RS parameter is updated through MAC CE signaling, then the update is flexible and fast, but the delay for PL to take effect is larger than the delay for new beam to take effect
Solution Approach 1:
The patent applies preliminary action by performing the closed-loop power control parameter reset immediately when the PL-RS update is triggered via MAC CE, rather than waiting for the PL to fully take effect. This preliminary reset prevents power accumulation issues during the delay period, maintaining the flexibility of MAC CE-based updates while mitigating the time loss.
Solution Approach 2:
The patent uses the closed-loop power control parameter reset as an intermediary mechanism that bridges the gap between the fast beam switching and the slower PL update process. This intermediary action ensures power stability during the transition period when the PL has not yet taken effect, reconciling the speed mismatch between beam switching and parameter updates.
3Reliability
If the closed-loop power control parameters are reset when PL-RS parameter is updated, then the transmission power stability is improved, but the parameter update complexity increases
Solution Approach 1:
The patent merges the closed-loop power control parameter reset operation with the existing PL-RS parameter update process. By combining these two operations into a single coordinated action triggered by the same event (PL-RS update), the patent improves power stability without significantly increasing system complexity, as the reset operation is integrated into the existing parameter update workflow.
Data Source
AI summary
Provided are a parameter resetting method and device, and a parameter information receiving method and device. The parameter resetting method includes that: after a PL corresponding to updated PL-RS parameter information takes effect, or after a beam state corresponding to updated beam state information takes effect, relevant parameters of closed-loop power control are reset. The described technical solution solves problems in the related art, such as a problem that in a process where a new beam takes effect and the PL of an old beam is still used, the closed-loop power control is likely to accumulate a large negative value, causing the transmission power to drop suddenly after the PL of the new beam takes effect.