Dynamic TxRU Power Indication Using DCI Power Offsets
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Solution Overview
Problem
Conventional methods for indicating transmission power updates in network power saving techniques, such as TxRU adaptation, result in significant signaling overhead and are inefficient for the dynamic nature of these adaptations, affecting uplink power control and random access channel procedures.
Innovation Solution
Implementing a fast transmission power indication mechanism using DCI format 2_X, which includes power offset values and scaling indications, to efficiently communicate transmission power changes to user equipment, minimizing signaling overhead and ensuring accurate power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SIB or RRC signaling is used to indicate transmission power updates, then the UE can determine the updated transmission power, but the signaling overhead becomes significant and the update speed is insufficient for dynamic TxRU adaptation
Solution Approach 1:
The patent extracts the essential transmission power indication function from the conventional SIB/RRC signaling framework and implements it through a dedicated DCI format 2_X mechanism. This separates the power indication function from general system information broadcasting, allowing faster, more efficient updates without the overhead of conventional per-UE signaling procedures.
Solution Approach 2:
The patent introduces dynamic transmission power indication through DCI format 2_X that can be quickly updated and applied in real-time. The mechanism allows the base station to dynamically adjust power parameters based on current TxRU adaptation needs, enabling fast response to changing network conditions without the delays inherent in conventional SIB/RRC updates.
2Reliability
If conventional per-UE signaling procedures are used for transmission power updates, then power control can be maintained, but the update speed is too slow for the dynamic nature of TxRU adaptation
Solution Approach 1:
The patent employs preliminary action by pre-configuring the UE with a set of possible power offset values through RRC signaling. When dynamic power adjustment is needed, the base station simply needs to indicate which pre-configured value to apply through DCI format 2_X, eliminating the need for full power parameter renegotiation and enabling rapid updates.
Solution Approach 2:
The DCI format 2_X mechanism provides immediate feedback to the UE about the current transmission power settings used by the base station. This feedback loop allows the UE to quickly adapt its reception parameters to match the dynamically adjusted downlink power, maintaining synchronization in real-time with TxRU adaptation changes.
3Loss of energy
If dynamic TxRU adaptation is implemented to save network power, then network power consumption is reduced, but the complexity of coordinating power updates with UE increases
Solution Approach 1:
The patent makes DCI format 2_X multi-functional by using it for both downlink control information and transmission power indication. This consolidates multiple functions into a single efficient signaling mechanism, reducing the overall coordination complexity between base station and UE during dynamic power adaptation.
Solution Approach 2:
The patent simplifies the coordination complexity by changing the parameter representation from absolute power values to relative power offsets. The base station transmits power offset values that are applied to a reference power level, reducing the amount of information that needs to be coordinated and transmitted while maintaining accurate power control.
Data Source
AI summary
A user equipment (UE) configured to decode, based on signals received from a base station, a set of power offset values, decode, based on signals received from the base station, a downlink control information (DCI), the DCI indicating a power offset value from the set of power offset values and determine a transmission power for a downlink signal to be transmitted by the base station based on at least the power offset value indicated by the DCI.