Flexible NR SRS Sounding With Segmented Subbands
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently sounding channels between user devices and base stations, particularly for cell-edge UEs, due to insufficient channel estimation quality and frequency selectivity, limiting the effectiveness of SRS transmissions.
Innovation Solution
The system configures SRS resources with segmented bandwidth regions into multiple subbands, allowing for non-overlapping or overlapping bandwidth segments, and indicates a specific subset for SRS transmission, enhancing channel estimation by concentrating transmit power on frequency domain resources with better reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If SRS transmission uses the full configured bandwidth region, then the base station receives more frequency domain resources, but the channel estimation quality deteriorates due to frequency selectivity and insufficient reception quality in certain subbands
Solution Approach 1:
The bandwidth region is segmented into multiple subbands (e.g., first subband, second subband, third subband) along the frequency domain. The UE is then configured to transmit SRS signals in specific subbands based on channel conditions, rather than using the full bandwidth uniformly. This segmentation allows the system to concentrate transmit power on subbands with better reception quality at the base station, thereby improving channel estimation accuracy while maintaining adequate frequency domain coverage.
2Quantity of substance
If the UE transmits SRS signals on all configured frequency domain resources, then the base station has more data to process, but the processing complexity and time required for channel estimation increases
Solution Approach 1:
Instead of requiring the UE to transmit SRS signals on all configured frequency domain resources, the system enables partial transmission by configuring the UE to transmit only on selected subbands. The network can dynamically determine which subbands provide sufficient channel estimation quality, thereby reducing the total number of SRS signals that need to be processed while maintaining adequate estimation accuracy. This partial action approach reduces base station processing complexity and time requirements.
3Device complexity
If the system uses fixed bandwidth configuration for SRS transmission, then the configuration is simple, but it cannot adapt to varying channel conditions and reception quality across different subbands
Solution Approach 1:
The system introduces dynamic configuration capabilities where the bandwidth region can be flexibly divided into multiple subbands, and the UE can be dynamically configured to transmit on specific subband combinations based on real-time or historical channel condition information. The network can adjust which subbands are activated for SRS transmission according to varying channel conditions, reception quality metrics, and interference levels. This dynamic approach maintains configuration simplicity through standardized subband definitions while enabling sophisticated adaptation to changing channel conditions.
Data Source
AI summary
A user device, UE, for a wireless communication network is configured or preconfigured with one or more Sounding Reference Signal, SRS, resources to be used for SRS transmissions. The one or more SRS resources include a plurality of frequency domain resources. Responsive to receiving an indication of a single bandwidth segment to be used for an SRS transmission, the UE performs the SRS transmission using the frequency domain resources of two or more subbands of the single bandwidth segment.