Aperiodic SRS Triggering via MAC CE for Low-Latency Updates
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Solution Overview
Problem
The existing methods for updating the association between aperiodic SRS triggering states and SRS resource sets or CC sets in wireless communications are inefficient due to high latency and require RRC signaling, which limits flexibility and efficiency in SRS transmission.
Innovation Solution
The use of Activation/Deactivation MAC CEs to dynamically update the association between aperiodic SRS triggering states and SRS resource sets or CC sets, allowing for lower latency and more flexible SRS transmission configurations through DCI formats 0_1, 1_1, and 2_3 with higher layer parameters srs-TPC-PDCCH-Group=typeB or typeA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If RRC signaling is used to update the association between aperiodic SRS triggering states and SRS resource sets or CC sets, then the association can be updated, but the latency increases and efficiency decreases
Solution Approach 1:
The patent replaces the RRC signaling mechanism (which operates at higher protocol layers and has higher latency) with a MAC CE-based mechanism (which operates at lower protocol layers and enables faster updates). This substitution of the control mechanism directly reduces latency and improves efficiency while maintaining the ability to update associations between SRS triggering states and resource sets.
2Adaptability or versatility
If RRC signaling is used to update SRS triggering state associations, then the association can be modified, but the flexibility and responsiveness are reduced
Solution Approach 1:
The patent introduces dynamic update capability through MAC CE signaling, allowing the association between SRS triggering states and resource sets to be changed in real-time based on current system conditions. This dynamic mechanism provides both flexibility to adapt to changing requirements and speed to respond quickly, overcoming the limitations of static or slow RRC-based updates.
3Adaptability or versatility
If multiple SRS CC sets are configured for carrier switching, then more transmission options are available, but the complexity of managing associations increases
Solution Approach 1:
The patent introduces MAC CE as an intermediary control mechanism that simplifies the management of multiple SRS CC sets. Instead of requiring complex direct configuration and management of multiple associations, the MAC CE provides a standardized interface for activating and deactivating specific CC sets associated with triggering states, thereby reducing management complexity while maintaining multiple transmission options.
Data Source
AI summary
Methods and apparatuses for associating aperiodic SRS triggering state(s) with SRS resource sets or SRS CC sets are disclosed. A method comprises transmitting an Activation/Deactivation MAC CE to indicate or update the association between aperiodic SRS triggering state(s) and the aperiodic SRS resource set(s) for the SRS request field value carried by DCI format 0_1 or 1_1 or DCI format 2_3 with a higher layer parameter srs-TPC-PDCCH-Group=typeB or the SRS CC set(s) for the SRS request field value carried by DCI format 2_3 with the higher layer parameter srs-TPC-PDCCH-Group=typeA.