UE MPR Reporting for Simultaneous Uplink Beam-Pair Selection
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Solution Overview
Problem
In cellular communication, the network is unaware of the power backoff values applied by user equipment (UE) due to overlapping beams during simultaneous transmission across multiple panels, leading to suboptimal beam selection and reduced uplink performance.
Innovation Solution
The UE reports power backoff values to the network, providing indications of a range of power backoff values associated with pairs of transmission configuration indicator states, enabling the network to optimize beam selection and avoid overlapping beam combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE applies power backoff due to overlapping beams during simultaneous transmission, then regulatory power limits are complied with, but the network is unaware of the power backoff values leading to suboptimal beam selection
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports power backoff values to the network through uplink signaling. The network node receives the reported power backoff value and uses this information to make informed beam selection decisions, thereby resolving the information asymmetry while maintaining regulatory compliance.
Solution Approach 2:
The patent enables the network to proactively select beam pairs that minimize power backoff by receiving advance reports from the UE about potential power backoff values. This allows the network to make preliminary beam selection decisions that avoid excessive power reduction, optimizing uplink performance before transmission occurs.
2Productivity
If the network selects beam combinations without knowledge of power backoff, then beam selection simplicity is maintained, but uplink performance is reduced due to suboptimal beam selection
Solution Approach 1:
The network receives feedback information from the UE regarding power backoff values for different beam pairs. This feedback enables the network to optimize beam selection for uplink performance while the reporting mechanism follows standardized protocols that manage the complexity of the selection process.
Solution Approach 2:
The patent changes the parameter set used for beam selection by incorporating power backoff values as an additional criterion. The network node selects beam pairs based on both channel quality and reported power backoff characteristics, optimizing the balance between transmission performance and power efficiency.
3Productivity
If the UE reports detailed power backoff information, then beam selection optimization is enabled, but signaling overhead increases
Solution Approach 1:
The patent transforms detailed power backoff information into a compact representation by mapping power backoff values to discrete power management maximum power reduction (P-MPR) levels. This parameter transformation enables beam selection optimization while significantly reducing the signaling overhead compared to reporting raw power backoff values.
Solution Approach 2:
The patent discards excessive detail in power backoff reporting by quantizing continuous power backoff values into discrete P-MPR levels. This selective discarding of fine-grained information maintains the essential optimization capability while reducing signaling burden, recovering only the most critical power level information needed for beam selection.
Data Source
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AI summary
An apparatus may be configured to: receive, from a first network node, a first indication to activate a first set of transmission configuration indicator states associated with the first network node; receive, from the first network node, a second indication of a second network node, wherein the apparatus is configured to perform simultaneous transmission, with the first network node and the second network node; and transmit, to the first network node, a first report, wherein the first report comprises at least one indication of a presence of a power backoff value associated with a pair of transmission configuration indicator states.