Superimposed SRS Power Control on Uplink Data Resources
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing sounding reference signals (SRS) for channel estimation due to infrequent transmissions, leading to outdated precoder selection and degraded downlink performance.
Innovation Solution
The technique involves superimposing SRS on uplink data transmissions within the same time and frequency resource, with the uplink data signal and SRS overlapping in both time and frequency, using different transmit powers based on a threshold SNR to minimize interference and enable effective channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmissions are performed frequently to improve channel estimation accuracy, then measurement precision is improved, but uplink data transmission performance deteriorates due to increased interference and resource occupation
Solution Approach 1:
The patent combines SRS transmission with uplink data transmission by superimposing SRS signals onto PUSCH resources. This merging allows the SRS to be transmitted simultaneously with data in the same time-frequency resources, improving channel estimation frequency without sacrificing data transmission performance, as the signals share the same resource allocation rather than competing for separate resources
Solution Approach 2:
The patent changes the power allocation parameters by introducing offset values (e.g., delta-PUSCH-SRS) that adjust the transmit power of superimposed SRS relative to PUSCH. This parameter adjustment ensures that SRS transmissions maintain sufficient power for accurate channel estimation while the overall power distribution preserves uplink data transmission performance
2Productivity
If SRS and uplink data share the same time-frequency resources to improve resource utilization, then productivity is improved, but signal quality deteriorates due to mutual interference
Solution Approach 1:
The patent applies local quality by differentiating power allocation for different signal components within the same resource. The SRS and uplink data transmitted in the same time-frequency resources are assigned different power levels based on their respective requirements, with SRS power adjusted using offset parameters to ensure sufficient quality for channel estimation while maintaining data transmission quality
Solution Approach 2:
The patent introduces power offset parameters as intermediaries that mediate between SRS and uplink data power allocation. These offset values (delta-PUSCH-SRS, delta-Arach-SRS) serve as control mechanisms to balance the power distribution, ensuring that mutual interference is managed while both signals coexist in the same resources
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may identify a time and frequency resource allocated to an uplink shared channel and may identify a threshold signal-to-noise ratio (SNR) associated with the time and frequency resource. The UE may transmit both an uplink data signal and a sounding reference signal (SRS) via at least the time and frequency resource. The uplink data signal and the SRS may overlap in both time and frequency within the time and frequency resource. The uplink data signal may be transmitted using a first transmit power and the SRS may be transmitted using a second transmit power. The first transmit power and the second transmit power may be based on the threshold SNR.