Codebook-Based Uplink Transmission Phase Coherence
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Solution Overview
Problem
In 5G and NR mobile networks, maintaining phase coherence in uplink transmissions from multiple antennas is challenging due to relative phase discontinuity and phase noise, which complicates the use of sounding reference signals and affects transmission efficiency.
Innovation Solution
Implementing codebook-based uplink transmission with UL codebook subset restriction, allowing network nodes to signal precoders for full or partial coherence, and using cyclic-prefix orthogonal frequency-division multiplexing (CP-OFDM) and discrete Fourier transform OFDM (DFT-OFDM) waveforms to support diverse transmission scenarios, thereby reducing transmission overhead and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If codebook-based uplink transmission is implemented to support multiple antennas, then transmission efficiency is improved, but maintaining phase coherence becomes difficult due to relative phase discontinuity and phase noise
Solution Approach 1:
The patent changes the parameter of phase reference from a fixed time point or power level to a dynamic reference that adapts to actual transmission conditions. By allowing flexible selection of phase reference points and adjusting phase compensation parameters based on channel conditions, the system maintains phase coherence while supporting efficient multi-antenna transmissions
Solution Approach 2:
The patent introduces dynamic phase compensation mechanisms that continuously adapt to changing phase conditions. The system dynamically adjusts phase references and compensation parameters based on real-time channel state information, transforming the static phase coherence problem into a dynamically manageable parameter
2Productivity
If UL codebook subset restriction is applied to accommodate coherence transmission capabilities, then system performance is optimized, but control signaling overhead increases
Solution Approach 1:
The patent segments the codebook into multiple subsets based on coherence transmission capabilities. By dividing the full codebook into smaller, capability-specific subsets, the system enables more precise matching between UE capabilities and codebook selections, reducing the need for extensive signaling while optimizing performance for each subset
Solution Approach 2:
The patent applies partial codebook restriction by signaling only the necessary subset indicators rather than complete codebook definitions. This partial action approach provides sufficient information for the UE to select appropriate precoders without transmitting excessive control signaling
3Adaptability or versatility
If precoders designed for full coherence are signaled for UEs with non-coherence capability, then transmission flexibility is improved, but transmission overhead increases
Solution Approach 1:
The patent creates a universal codebook framework that serves multiple coherence capabilities. By designing codebooks that can be appropriately selected and restricted based on UE capability, the same signaling mechanism achieves both full-coherence and non-coherence transmission scenarios, providing universality without requiring separate signaling schemes
Data Source
AI summary
Various solutions with respect to codebook-based uplink transmission in wireless communications are described. A user equipment (UE) receives a first signal from a network node of a wireless network, with the first signal selecting one or more codewords or a codebook from a plurality of different codebooks within a master codebook as allowed precoders at transmission ranks. The UE also receives a second signal from the network node, with the second signal selecting a precoder among the allowed precoders for uplink (UL) transmission. The UE then processes data using the selected precoder and performs an UL transmission of the processed data to the network node.