Flexible Aperiodic SRS Triggering via Dynamic Offset Selection
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Solution Overview
Problem
Current 5G new radio (NR) technologies face limitations in enhancing aperiodic Sounding Reference Signal (SRS) triggering, particularly in terms of flexibility and Downlink Control Information (DCI) overhead, necessitating improvements for more flexible triggering and reduced overhead in both Frequency Range 1 and 2, as well as enhanced SRS capacity and coverage.
Innovation Solution
The proposed solution involves configuring aperiodic SRS transmission based on parameters received via downlink control information (DCI) or higher-layer signaling, allowing for flexible offset configurations, including single or multiple values for the offset parameter 't', which determines the timing of SRS transmission relative to the reference slot, enabling more flexible and efficient SRS resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed offset value is used for aperiodic SRS triggering, then the system complexity is reduced, but the flexibility of SRS transmission timing is limited
Solution Approach 1:
The patent implements dynamic offset selection by allowing the offset value to be changed based on DCI triggering. The system transitions from a static fixed offset to a dynamic mechanism where the offset can be selected from multiple configured values or determined by DCI fields, enabling flexible adaptation of SRS transmission timing to varying network conditions while maintaining manageable complexity through pre-configuration of candidate offset values.
2Adaptability or versatility
If multiple offset values are configured for flexible SRS triggering, then the adaptability is improved, but the DCI overhead increases
Solution Approach 1:
The patent applies partial action by configuring multiple offset values in advance through higher layer signaling, but only activating a subset of these values through DCI triggering. The DCI needs to indicate only the selected value from the pre-configured set, rather than transmitting complete timing information, thereby reducing DCI overhead while maintaining triggering flexibility.
Solution Approach 2:
The system performs preliminary configuration of multiple offset values through higher layer signaling before actual SRS triggering occurs. This pre-configuration allows the DCI to reference pre-agreed offset values using minimal bits, reducing the information overhead in DCI while enabling flexible selection among multiple timing options.
3Manufacturing precision
If the offset is configured separately for each A-SRS resource, then the precision of resource management is improved, but the configuration complexity increases
Solution Approach 1:
The patent segments the SRS resource configuration by allowing separate offset parameters for different A-SRS resources or resource sets. Each resource can have its own offset configuration, enabling precise control of transmission timing for different resources while the segmentation allows independent optimization of each resource's timing characteristics.
4Reliability
If the SRS transmission is delayed to an available slot, then the reliability of transmission is improved, but the time delay increases
Solution Approach 1:
The system dynamically determines the SRS transmission slot by evaluating availability conditions. When the calculated slot n+t is available for uplink transmission, the SRS is transmitted immediately at that slot. When the slot is not available, the transmission is delayed to the next available slot. This dynamic approach ensures reliable transmission by adapting to actual uplink availability while minimizing unnecessary delays.
Data Source
AI summary
A wireless communication method is disclosed that includes receiving, via downlink control information (DCI) or higher layer signaling, configuration information including a parameter and configuring aperiodic Sounding Reference Signal (SRS) (A-SRS) transmission based on the parameter. In other aspects, a terminal and a wireless communication system are also disclosed.