Uplink Sub-band Precoding Using Downlink Channel Information
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Solution Overview
Problem
Uplink transmission channels in wireless communication systems typically have lower throughput and coverage due to limitations in terminal space, hardware cost, and complexity, with wideband precoding providing limited performance improvement.
Innovation Solution
The method involves using downlink channel information to estimate precoding for uplink transmission, with sub-band granularity, to enhance channel estimation accuracy and improve uplink transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wideband precoding is used for uplink transmission, then the terminal can achieve some performance improvement, but the channel estimation accuracy remains insufficient
Solution Approach 1:
The patent segments the uplink transmission channel into multiple sub-bands in the frequency domain, with each sub-band having its own precoding parameters. This segmentation allows for more precise channel estimation and independent optimization of precoding for each sub-band, resolving the contradiction between wideband precoding performance and sub-band level estimation accuracy.
Solution Approach 2:
The patent applies local quality by enabling different precoding configurations for different sub-bands based on their specific channel characteristics. Each sub-band can have tailored precoding parameters that optimize performance for that particular frequency range, rather than using a uniform wideband approach.
2Measurement precision
If sub-band precoding with downlink channel information is used, then channel estimation accuracy is improved, but terminal hardware complexity increases
Solution Approach 1:
The patent uses copying by leveraging the downlink channel information as a reference to derive uplink precoding parameters. Instead of requiring the terminal to perform complex channel estimation and processing for uplink transmission, the system copies the downlink channel characteristics to inform the uplink precoding, significantly reducing terminal hardware complexity while maintaining high estimation accuracy.
Solution Approach 2:
The patent applies preliminary action by performing channel estimation and precoding parameter derivation in advance using downlink reference signals before the actual uplink transmission occurs. This preliminary processing reduces the computational burden during uplink transmission and simplifies terminal hardware requirements.
3Area of stationary object
If downlink channel information is used for uplink precoding, then uplink transmission coverage is enhanced, but the requirement for downlink reference signal reception increases
Solution Approach 1:
The patent applies universality by making the downlink reference signal serve dual purposes: both for downlink transmission and for deriving uplink precoding information. This multi-functionality enhances uplink transmission coverage while avoiding the need for separate uplink reference signals, thereby reducing the overall system requirement complexity.
Data Source
AI summary
Provided are an uplink transmission method and device. The uplink transmission method is applied to a first communication node and includes: receiving a downlink reference signal sent by a second communication node and acquiring downlink channel information; sending an uplink reference signal by using the downlink channel information; monitoring downlink control signaling sent by the second communication node, where the downlink control signaling includes a sub-band SRS resource indication; and sending an uplink transmission channel according to scheduling of the downlink control signaling.