SRS Time Bundling for 5G Channel Estimation
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Solution Overview
Problem
In 5G NR wireless communication systems, the measurement performance of sounding reference signals (SRS) deteriorates due to instantaneous/dynamic interference and channel variations, leading to inadequate channel estimation, especially when interference is frequency-selective.
Innovation Solution
The implementation of SRS time bundling, where multiple SRS resources are associated or bundled in the time domain to enhance measurement performance, by configuring aperiodic SRS based on the frequency location and parameters of non-aperiodic SRS occasions, and using DCI signaling to trigger transmissions, thereby improving channel estimation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SRS resources are transmitted separately in frequency domain, then frequency diversity can be achieved, but measurement performance deteriorates due to instantaneous interference and channel variations
Solution Approach 1:
The patent combines multiple SRS resources in the time domain by configuring them to share the same frequency location and time location, forming a bundled SRS resource set. This merging approach allows the network to aggregate channel state information from multiple SRS transmissions, improving measurement reliability without sacrificing estimation precision, thereby resolving the contradiction between reliability and measurement precision.
2Adaptability or versatility
If SRS resources are configured with different frequency locations, then frequency selectivity can be addressed, but SRS overhead increases
Solution Approach 1:
The patent introduces dynamic frequency hopping within the bundled SRS resource set, where SRS resources can switch between different frequency locations based on channel conditions and interference patterns. This dynamic approach allows the system to adapt to frequency-selective fading and interference while reusing the same set of frequency resources across multiple time instances, thereby maintaining adaptability without proportionally increasing SRS overhead.
3Ease of operation
If aperiodic SRS is triggered by DCI, then flexibility in transmission timing is achieved, but determination of frequency location becomes complex
Solution Approach 1:
The patent pre-configures multiple possible frequency locations for aperiodic SRS resources in the bundled resource set before transmission occurs. When DCI triggers an aperiodic SRS transmission, the UE can directly select from these pre-determined frequency locations based on simple indexing or selection rules provided in the DCI, rather than performing complex real-time frequency location calculations. This preliminary configuration significantly reduces the computational complexity at transmission time while maintaining timing flexibility.
Data Source
AI summary
Presented are systems and methods for sounding reference signal (SRS) time bundling. A wireless communication device may receive a configuration to determine a first frequency location of an aperiodic SRS from a wireless communication node. The first frequency location may be determined according to a second frequency location of at least one occasion of a non-aperiodic SRS. The wireless communication device may receive a downlink control information (DCI) transmission. The wireless communication device may transmit, responsive to the DCI transmission, the aperiodic SRS using the first frequency location.