SRS Antenna Switching Mitigation Through Rank Capping
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Solution Overview
Problem
Sounding reference signal (SRS) switching in wireless communication systems impacts the availability of antennas, leading to reduced throughput and communication errors due to scheduling conflicts and antenna unavailability.
Innovation Solution
A user equipment (UE) caps the maximum supported rank for reception and transmission based on impacted antennas due to SRS switching, mitigates the impact by indicating a lower rank, and manages scheduling collisions to improve communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS switching is performed to enable antenna utilization for channel sounding, then antenna availability for channel measurement is improved, but communication throughput deteriorates due to scheduling conflicts and antenna unavailability
Solution Approach 1:
The UE performs preliminary actions by detecting SRS switching events and proactively adjusting reception parameters before communication degradation occurs. The UE identifies impacted antennas through SRS switching detection and preemptively caps the maximum supported rank or suspends PDSCH reception on affected component carriers, preventing throughput loss rather than reacting after degradation occurs
Solution Approach 2:
The system implements feedback mechanisms where the UE monitors SRS switching events and provides feedback information to the network about impacted antennas and component carriers. This feedback enables the network to adjust scheduling decisions and resource allocation to avoid conflicts between SRS switching and data transmission, thereby maintaining throughput while enabling antenna utilization for channel sounding
2Adaptability or versatility
If SRS switching occurs to switch antennas for channel measurement, then channel sounding capability is improved, but communication reliability deteriorates due to scheduling collisions and signal interference
Solution Approach 1:
The UE performs preliminary detection of SRS switching events and identifies which antennas will be impacted before actual communication occurs. By detecting the switching event in advance, the UE can cap the maximum supported rank or suspend reception on affected component carriers, preventing communication errors and maintaining reliability while preserving channel sounding capability
Solution Approach 2:
The system converts the harmful effect of SRS switching (antenna unavailability causing communication errors) into a beneficial control mechanism. The UE uses the SRS switching event information to dynamically adjust reception parameters, transforming what would be a pure harm into a controlled feature that maintains both channel sounding and communication reliability through coordinated rank capping and carrier suspension
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may select a maximum supported rank for reception that is capped based at least in part on one or more impacted antennas of the UE that are unavailable due to sounding reference signal (SRS) switching that switched at least one antenna of the UE. The UE may transmit an indication of the maximum supported rank. The UE may receive a selected rank that is no greater than the maximum supported rank. The UE may receive, from one or more non-impacted antennas of the UE, a communication using the selected rank. Numerous other aspects are described, such as downlink blanking, desensing parameters, canceling SRS switching, and uplink blanking for impacted antennas.