Codebook-Based Uplink Multi-Antenna Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink multi-antenna transmission, particularly in large-scale or ultra-large-scale MIMO environments, where energy-efficient and high-frequency-efficiency precoding schemes are required.
Innovation Solution
The method involves a terminal receiving configuration information for a sounding reference signal (SRS) resource set from a base station, obtaining downlink channel values, determining SRS and PUSCH precoding matrices, and transmitting these signals with applied precoding, thereby optimizing uplink multi-antenna transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If codebook-based PUSCH transmission is implemented in large-scale MIMO environments, then frequency efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the codebook into multiple codebook groups, each associated with different SRS resource sets. This segmentation allows the system to manage complexity by organizing precoding information in a structured manner while maintaining high frequency efficiency through selective codebook group indication via SRI fields.
Solution Approach 2:
The patent performs preliminary actions by pre-configuring multiple codebook groups and their associated SRS resource sets before actual PUSCH transmission. The base station prepares the codebook group information and SRI mappings in advance, enabling efficient uplink transmission without real-time complex calculations.
2Adaptability or versatility
If multiple codebook groups are configured for different SRS resource sets, then adaptability to frequency-selective channels is improved, but signaling overhead increases
Solution Approach 1:
The patent creates a universal mapping relationship between SRI fields and codebook groups that can handle multiple SRS resource sets and codebook groups simultaneously. The same SRI field structure is used to indicate different codebook groups based on the activated SRS resource set, reducing the need for separate signaling mechanisms.
Solution Approach 2:
The patent changes the interpretation of SRI field parameters based on the activated SRS resource set. When different SRS resource sets are activated, the SRI field maps to different codebook groups, allowing the system to adapt to frequency-selective channels without increasing signaling overhead.
3Use of energy by moving object
If downlink channel values are used to determine uplink precoding matrices, then energy efficiency is improved, but accuracy in uplink channel estimation may deteriorate
Solution Approach 1:
The patent uses downlink channel values as an intermediary to determine uplink precoding matrices. Instead of directly measuring uplink channels, the system uses downlink reference signals and channel reciprocity to derive precoding information, reducing uplink measurement requirements while maintaining acceptable accuracy through the intermediary downlink channel measurements.
Data Source
AI summary
A method of a terminal performing codebook-based PUSCH transmission may comprise: receiving, from a base station, configuration information of an SRS resource set; receiving downlink reference signals from the base station through a spatial filter corresponding to the SRS resource set, and obtaining downlink channel values based on the received downlink reference signal; determining an SRS precoding matrix based on the downlink channel values, and transmitting, to the base station, an SRS to which the SRS precoding matrix is applied; receiving, from the base station, an SRI and precoding information determined based on the SRS; and determining a PUSCH precoding matrix based on SRS resource(s) indicated by the SRI and the precoding information, and transmitting, to the base station, a PUSCH to which the PUSCH precoding matrix is applied.