UE Subband Precoding TPMI Reinterpretation for Full Power
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Solution Overview
Problem
User Equipment (UE) with non-coherent or partially coherent antennas in wireless communication systems cannot transmit with full power due to power control mechanisms that scale and split transmission power across antenna ports, leading to reduced overall transmission power.
Innovation Solution
The UE reinterprets the Transmitted Precoding Matrix Indicator (TPMI) to transmit on multiple subbands, allowing for full power transmission by assigning different TPMIs to each subband, thereby enabling simultaneous transmission from non-coherent antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power control scales transmission power by the ratio of antenna ports with non-zero PUSCH to configured antenna ports, then power is distributed across transmitting antennas, but overall transmission power is reduced
Solution Approach 1:
The patent divides the frequency band into multiple subbands and applies different TPMIs to each subband. This segmentation allows different antenna ports to transmit simultaneously on different subbands, effectively utilizing all configured antenna ports and achieving full transmission power without power scaling reduction
Solution Approach 2:
The patent dynamically selects and applies different TPMIs from a codebook to different subbands based on channel conditions. This dynamic adaptation enables the system to optimize power utilization across antenna ports while maintaining transmission quality, resolving the contradiction between power distribution and overall power reduction
2Power
If non-coherent antennas include zero precoders in MIMO codebooks, then antenna isolation is maintained, but transmission power is lost on those antennas
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands and assigns different TPMIs to each subband. This allows non-coherent antennas to transmit on different subbands with non-zero precoders, eliminating power loss while maintaining antenna isolation through frequency-domain separation
Solution Approach 2:
The patent transitions from time-domain or spatial-domain antenna isolation to frequency-domain isolation by applying subband-specific TPMIs. This dimensional change allows non-coherent antennas to coexist and transmit simultaneously by separating their operations in the frequency dimension
3Power
If a single TPMI is used for all subbands, then control overhead is minimized, but power transmission efficiency is reduced
Solution Approach 1:
The patent segments the overall TPMI indication into subband-specific TPMIs, where a single DCI message contains a master TPMI that maps to multiple subband-specific TPMIs through codebook indexing. This segmentation enables efficient power utilization across subbands while minimizing DCI overhead through compact representation
Solution Approach 2:
The patent uses a master TPMI indication in DCI that effectively copies or maps to multiple subband-specific TPMIs through codebook relationships. This copying mechanism allows the system to convey multiple precoding configurations using a single TPMI field, reducing control overhead while maintaining power transmission efficiency
Data Source
AI summary
Aspects are provided allowing UEs with non-coherent or partially coherent antennas to re-interpret TPMI received in DCI into a set of TPMIs corresponding to different subbands. The UE receives a TPMI associated with at least one first antenna and at least one second antenna which are non-coherent with each other, and the UE determines a set of TPMIs including a first and second TPMI based on the received TPMI. The set of TPMIs include at least one TPMI different from the received TPMI. The UE transmits, based on the first TPMI, from the at least one first antenna within at least one first subband. The UE also transmits, based on the second TPMI, from the at least one second antenna within at least one second subband different from the at least one first subband. Thus, full power transmission based on re-interpreted TPMI with reduced DCI overhead may result.