SRS-Switching Conflict Mitigation via Dynamic Priority and Skipping
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Solution Overview
Problem
Sounding reference signal (SRS) switching in LTE/NR communication systems can cause interruptions to adjacent carriers or radio access technologies (RATs) sharing the same RF front-ends, leading to conflicts and blanking impacts.
Innovation Solution
The proposed solutions include reporting blanking statistics, multi-chance SRS-switching, dynamic priority adjustment for SRS-skipping, time-bundling of SRS-switching configurations, and condition-based SRS-skipping logic to mitigate the impact of SRS-switching on victim carriers or RATs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS-switching is performed to enable antenna switching for channel sounding, then channel state information acquisition is improved, but interruptions and conflicts occur on adjacent carriers or RATs sharing the same RF front-ends
Solution Approach 1:
The system performs preliminary assessment of SRS-switching opportunities by evaluating potential conflicts with adjacent carriers or RATs before executing the switching. The UE determines whether an SRS-switching opportunity should be skipped by checking if it would cause harmful effects on other carriers or technologies sharing the RF front-end, and makes a decision to skip or proceed accordingly.
Solution Approach 2:
The system implements feedback mechanisms where the UE reports SRS-switching capability information and conflict status to the network. The network can configure multiple SRS-switching opportunities with different priorities and adjust configurations based on reported blanking statistics and conflict conditions, enabling adaptive optimization of SRS-switching behavior.
2Reliability
If multiple SRS-switching opportunities are configured to improve channel sounding coverage, then measurement reliability is improved, but the complexity of managing conflicts and priorities increases
Solution Approach 1:
The system segments SRS-switching opportunities into multiple independently configurable instances, each with its own priority level and conflict assessment. This allows the network to configure multiple opportunities with different characteristics (periodicities, offsets, priorities) to achieve comprehensive channel sounding coverage while managing conflicts on a per-opportunity basis through systematic priority evaluation.
3Productivity
If SRS-switching is performed frequently to improve channel state accuracy, then communication performance is improved, but blanking impacts on victim carriers or RATs increase
Solution Approach 1:
The system dynamically adjusts SRS-switching behavior based on real-time conflict conditions and priority assessments. Instead of fixed frequent switching, the UE adaptively determines whether to skip or execute each SRS-switching opportunity based on current RF front-end usage status, victim carrier/RAT priority levels, and configured thresholds, optimizing the balance between channel state accuracy and minimizing blanking impacts.
Data Source
AI summary
Reporting potential impacts of sounding reference signal-switching (SRS-switching) to a base station may include determining that SRS-switching is to be performed by a UE. Based on determining that SRS-switching is to be performed, potential impacts to one or more of a plurality of radio access technologies (RATs) caused by performing SRS-switching while sharing radio frequency (RF) front-ends (RFFE) between at least a subset of the plurality of RATS may be processed. The potential impacts may comprise at least one of transmit-blanking (Tx-blanking) and receive-blanking (Rx-blanking) associated with one or more of the subset of RATs. A communication that indicates the potential impacts of SRS-switching may be encoded for transmission to a base station. The base station may also provide priority configurations for determining how to handle Tx-blanking, Rx-blanking, and SRS-skipping associated with SRS-switching.