Uplink Codeword Layer Mapping and Phase Tracking Signaling
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Solution Overview
Problem
Current wireless network standards, such as those defined by 3GPP TSs, face challenges in efficiently managing uplink transmissions in NR networks, particularly in handling multiple codewords and varying signal-to-noise-and-interference ratios (SINR) across different UE panels.
Innovation Solution
The proposed solution involves advanced codeword-to-layer mapping schemes and PTRS transmission concepts that allow for the efficient use of multiple codewords in NR networks. This includes configuring codewords to be transmitted on different layers with specific modulation and coding schemes (MCS), and determining PTRS time domain density based on the associated MCS or common MCS across layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple codewords are transmitted on different layers with specific MCS, then link adaptation is improved, but device complexity increases
Solution Approach 1:
The patent segments the uplink transmission by dividing codewords into different layers (first codeword on first layer, second codeword on second layer) with different MCS configurations. This segmentation allows independent optimization of each layer's transmission parameters, improving link adaptation while managing complexity through structured division.
Solution Approach 2:
The patent implements dynamic MCS selection for different codewords and layers based on channel conditions. The gNB can independently configure MCS for each codeword-layer pair, allowing adaptive adjustment of transmission parameters to match varying channel quality, thereby improving reliability without requiring complete reconfiguration of the entire transmission system.
2Measurement precision
If PTRS time domain density is determined based on associated MCS, then phase tracking precision is improved, but processing complexity increases
Solution Approach 1:
The patent changes the parameter of PTRS time domain density based on the associated MCS. When a codeword is associated with a higher MCS, the PTRS time domain density is increased to provide more phase tracking reference signals, thereby improving phase tracking precision. This parameter adaptation is performed only for PTRS configuration, not for the entire transmission system, managing complexity effectively.
3Productivity
If multiple codewords are enabled for uplink transmissions, then resource utilization is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements a universal codeword-to-layer mapping framework that can handle both single-codeword and multi-codeword transmissions through the same basic structure. The gNB configures multiple codewords with different MCS, and the UE maps them to different layers using a standardized procedure, making the system multi-functional without requiring separate operational modes for different transmission scenarios.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods for mapping codewords to transmission layers and transmitting phase tracking reference signals in wireless networks.