Conditional TRS/CSI-RS Indication for Idle UE Power Saving
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Solution Overview
Problem
Existing 3GPP technologies face challenges in optimizing power saving enhancements for user equipment (UEs) in idle and inactive modes, particularly in managing tracking reference signals (TRS/CSI-RS) to balance power consumption and synchronization accuracy.
Innovation Solution
The solution involves signaling the conditional availability of TRS/CSI-RS occasions based on paging messages, using explicit or implicit indications in System Information Blocks (SIBs), paging PDCCH/PDSCH, or paging early indications, and defining transmission criteria such as predetermined numbers, time windows, or beam-based operations to reduce unnecessary UE power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TRS/CSI-RS is transmitted at all configured occasions, then synchronization accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic TRS/CSI-RS transmission by introducing a flag field that enables the network to flexibly indicate whether TRS/CSI-RS should be transmitted at configured occasions. This allows the system to adapt transmission behavior based on actual synchronization needs, transitioning between continuous transmission (high accuracy) and selective transmission (low power consumption) modes.
Solution Approach 2:
The patent changes the transmission parameter state by using a flag field to switch between different transmission configurations. When the flag indicates conditional availability, the system transitions from always transmitting TRS/CSI-RS to only transmitting when paging messages are present, effectively changing the transmission density parameter to balance accuracy and power consumption.
2Measurement precision
If TRS/CSI-RS is transmitted frequently, then synchronization accuracy is improved, but unnecessary power consumption occurs
Solution Approach 1:
The patent extracts the essential function of TRS/CSI-RS transmission (providing synchronization when needed) while removing the unnecessary continuous transmission component. By using the flag field to indicate conditional availability, the system keeps only the useful transmissions (when paging messages exist) and eliminates wasteful transmissions (when no paging messages are present).
Solution Approach 2:
Instead of continuous full transmission, the patent implements partial transmission by only sending TRS/CSI-RS when paging messages are present. This partial action approach provides sufficient synchronization accuracy for the actual needs while avoiding excessive energy loss from unnecessary transmissions during periods when no paging traffic exists.
3Use of energy by moving object
If TRS/CSI-RS transmission is optimized for power saving, then battery life is improved, but synchronization accuracy may deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the network side decides whether to transmit TRS/CSI-RS based on the presence of paging messages, and this decision is communicated to the UE through the flag field. This feedback loop ensures that synchronization signals are transmitted only when actually needed for maintaining connection, preventing both unnecessary power consumption and potential synchronization degradation.
Solution Approach 2:
The patent uses preliminary action by having the network pre-configure the UE with the flag field indication about conditional TRS/CSI-RS availability. This allows the UE to anticipate whether synchronization signals will be present and adjust its power consumption accordingly, ensuring synchronization accuracy is maintained when needed while saving power when not needed.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods for reference signal indication for idle or inactive user equipments.