5G NR User Equipment SRS Triggering Flexibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The aperiodic sounding reference signal (A-SRS) triggering in 5G NR is not flexible enough, as it is limited to configurations set through radio resource control (RRC) signaling, which restricts the ability to adjust SRS measurement behaviors.
Innovation Solution
User equipment (UE) is equipped with a radio frequency (RF) signal processing device and processor that receive first and second slot offset information from a network node, allowing for flexible SRS triggering by using additional slot offset information carried in the downlink control information (DCI) or media-access-control control-element (MAC-CE), enabling SRS transmission even if the configured DCI is not in the default slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If A-SRS triggering is limited to RRC signaling configurations, then system complexity is reduced, but triggering flexibility is insufficient
Solution Approach 1:
The patent segments the SRS triggering mechanism into two parts: RRC signaling for basic configuration and DCI for dynamic triggering control. This segmentation allows RRC to handle static configurations while DCI provides flexible dynamic triggering, resolving the contradiction between flexibility and complexity by dividing the triggering function into configuration and execution phases.
Solution Approach 2:
The patent introduces dynamic triggering through DCI that can override static RRC configurations. The DCI-based triggering mechanism allows real-time adjustment of SRS transmission timing and resources without requiring complex reconfiguration procedures, enabling adaptive triggering behavior that responds to changing network conditions while maintaining manageable system complexity.
2Manufacturing precision
If multiple slot offset information parameters are introduced, then SRS transmission accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent uses RRC signaling to pre-configure slot offset parameters before actual SRS triggering occurs. This preliminary configuration establishes the timing relationship between DCI and SRS resources in advance, allowing the DCI to trigger SRS transmission with precise timing without requiring all parameters to be transmitted dynamically, thus reducing signaling overhead while maintaining timing accuracy.
Solution Approach 2:
The patent introduces an intermediary calculation mechanism where the actual SRS transmission timing is derived by combining the slot offset between DCI and reference slot with the slot offset between reference slot and SRS resource. This intermediary reference slot concept allows precise timing calculation through parameter combination rather than direct signaling of absolute timing, reducing the information overhead while achieving accurate SRS transmission timing.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
User equipment (UE) for sounding reference signal (SRS) triggering is provided. The UE may include a radio frequency (RF) signal processing device and a processor. The RF signal processing device receives first slot offset information and second slot offset information from a network node. The first slot offset information is configured through a radio resource control (RRC) information element (IE) to indicate a first time difference between the down link control information (DCI) and a resource reference slot. The second slot offset information indicates the second time difference between the reference slot and an SRS resource. The processor is coupled to the RF signal processing device. When the RF signal processing device receives the DCI, the processor triggers an SRS transmission for the SRS resource according to the first slot offset information and the second slot offset information