Uplink MIMO SRS PRG Selection and Precoder Allocation
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Solution Overview
Problem
In 5G wireless communication systems, selecting the appropriate precoding resource block group (PRG) size and precoders for sounding reference signal (SRS) transmissions is challenging due to differences in OFDM and DFT-s-OFDM waveforms, which affects transmission efficiency and compatibility across subbands.
Innovation Solution
The method involves determining the PRG size for SRS transmission based on the number of ports and power headroom, allowing for the same precoder to be used within each PRG, and distinguishing between OFDM and DFT-s-OFDM by using different ports, thereby enabling efficient PRG selection and precoder allocation for improved communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different precoders are used for different subbands in SRS transmission, then transmission efficiency is improved, but device complexity and precoder selection difficulty increase
Solution Approach 1:
The patent divides the frequency bandwidth into multiple subbands, with each subband assigned a specific precoder. This segmentation allows different precoders to be applied to different subbands, improving transmission efficiency by matching channel conditions locally while keeping the precoder selection manageable through structured codebook designs and association rules between SRS resources and precoders
Solution Approach 2:
The patent applies the principle of local quality by allowing different precoders to be used for different subbands based on local channel conditions. Each subband can have optimized precoding parameters tailored to its specific characteristics, while the overall system maintains coordination through the defined association between SRS resources and precoders
2Adaptability or versatility
If OFDM and DFT-s-OFDM waveforms are supported in uplink, then system versatility is improved, but differences in precoder matrix and Tx power scaling complicate transmission schemes
Solution Approach 1:
The patent implements a unified SRS transmission framework that supports both OFDM and DFT-s-OFDM waveforms through common resource allocation and precoding mechanisms. By defining universal association rules between SRS resources and precoders that work across different waveform types, the system achieves versatility while managing complexity through standardized procedures
Solution Approach 2:
The patent handles waveform-specific differences by dynamically adjusting parameters such as precoder matrix selection and transmit power scaling factors based on the detected waveform type. The base station identifies whether OFDM or DFT-s-OFDM is used and applies appropriate parameter configurations, allowing flexible adaptation without requiring fundamentally different transmission schemes
Data Source
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AI summary
Certain aspects of the present disclosure relate to methods and apparatus for Uplink MIMO reference signals and data transmission schemes communications systems operating according to 5G technologies. For example, one or more techniques for enabling PRG selection and conveying that selection are provided. In some cases, precoder selection techniques may be provided. Further, in some cases, techniques may be provided to distinguish OFDM and DFT-s-OFDM by using different ports.