Uplink Precoding Matrix Selection for Subband Coding Accuracy
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Solution Overview
Problem
The Rel-15 protocol's limited support for indicating Transmitted Precoding Matrix Indicator (TPMI) per subband results in low reliability of uplink data transmission due to poor coding accuracy and low signal-to-noise ratio.
Innovation Solution
The method involves receiving uplink scheduling information with TPMI indication for each subband, determining a precoding matrix for each subband based on the TPMI, and precoding the uplink data accordingly, allowing for improved accuracy and reliability by using distinct TPMIs for each subband.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wideband TPMI indication is used for uplink scheduling, then device complexity is reduced, but manufacturing precision (coding accuracy) deteriorates
Solution Approach 1:
The patent divides the frequency band into multiple subbands and provides separate TPMI indication for each subband. This segmentation allows the system to maintain simple wideband scheduling while achieving precise per-subband precoding, resolving the contradiction between scheduling complexity and coding accuracy.
Solution Approach 2:
The patent applies different precoding matrix indicators to different subbands based on local channel conditions. Each subband can use the most appropriate precoding matrix for its specific characteristics, improving overall coding accuracy without requiring complete redesign of the scheduling system.
2Loss of information
If wideband TPMI indication is used for uplink scheduling, then signaling overhead is reduced, but reliability deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into subbands and provides TPMI indication for each segment. This approach increases reliability by adapting to local channel variations while keeping signaling overhead manageable through efficient indication mechanisms.
Solution Approach 2:
The patent enables dynamic adaptation of precoding matrices to changing channel conditions in different subbands. This dynamic approach improves transmission reliability by ensuring that each subband uses the optimal precoding matrix for its current state.
3Device complexity
If wideband TPMI indication is used for uplink scheduling, then system simplicity is maintained, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent optimizes signal-to-noise ratio by applying locally adapted precoding matrices to each subband based on its specific channel characteristics. This local optimization improves signal quality without requiring complete system redesign.
Solution Approach 2:
The patent changes the precoding matrix parameters independently for each subband to match local channel conditions. This parameter adaptation maximizes signal-to-noise ratio while maintaining overall system simplicity through the existing TPMI indication framework.
Data Source
AI summary
An uplink data transmission method, a user equipment and a readable storage medium are provided. The method includes: receiving uplink scheduling information, wherein the uplink scheduling information comprises indication information of a Transmitted Precoding Matrix Indicator (TPMI) corresponding to each subband used for transmitting the uplink data, and the indication information of the TPMI corresponding to each subband corresponds to a same Rank Indicator (RI) information; determining a precoding matrix corresponding to each subband based on the indication information of the TPMI corresponding to each subband, respectively; and precoding the uplink data to be transmitted on each subband based on the precoding matrix corresponding to each subband, respectively, and transmitting the uplink data.