Aperiodic SRS Slot Offset Signaling for Flexible NR Scheduling
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Solution Overview
Problem
The inflexibility of aperiodic SRS triggering in the NR system due to fixed slot offsets configured by RRC signaling limits the system's flexibility and scheduling options, especially when uplink and downlink directions dynamically change.
Innovation Solution
Introduce dynamic indication of slot offsets using DCI, allowing each SRS resource set to be configured with multiple slot offsets, and the network device indicates the specific offset via an indication field in DCI for each aperiodic SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If slot offset for aperiodic SRS triggering is configured by RRC signaling, then configuration simplicity is improved, but system flexibility deteriorates
Solution Approach 1:
The slot offset configuration is segmented into two parts: RRC signaling provides the basic configuration (slot offset K2), while DCI provides dynamic adjustments (offset indicator). This segmentation allows the system to maintain configuration simplicity through RRC while gaining flexibility through DCI-based dynamic indication.
Solution Approach 2:
The patent introduces dynamic indication of slot offsets through DCI signaling, allowing the slot offset value to be adjusted dynamically based on current transmission needs. This transforms the previously static RRC-configured offset into a dynamic parameter that can adapt to changing uplink-downlink slot configurations.
2Device complexity
If fixed slot offset is used for SRS transmission, then scheduling complexity is reduced, but scheduling adaptability deteriorates
Solution Approach 1:
The patent makes the slot offset dynamic by introducing DCI-based indication fields that can adjust the offset value based on current scheduling requirements. This allows the system to adapt to dynamic uplink-downlink slot configurations while maintaining relatively simple processing through predefined offset values.
Solution Approach 2:
The patent changes the slot offset parameter from a fixed RRC-configured value to a dynamically adjustable parameter through DCI indication. The indication field in DCI can specify different offset values (e.g., 0, 1, 2 slots) to adapt to different scheduling scenarios, transforming a static parameter into a flexible one.
3Adaptability or versatility
If RRC signaling reconfigures slot offset, then adaptability is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent prepares multiple possible slot offset values in advance through RRC configuration (e.g., K2 values of 0, 1, 2 slots). During dynamic scheduling, the system only needs to indicate which pre-configured value to use via DCI, rather than reconfiguring the entire slot offset parameter through RRC signaling. This preliminary preparation reduces signaling latency significantly.
Solution Approach 2:
The patent extracts the dynamic adjustment function from RRC signaling and places it in DCI signaling. By separating the basic configuration (RRC) from the dynamic indication (DCI), the system can make quick adjustments through compact DCI fields without the overhead and latency of RRC reconfiguration procedures.
4Device complexity
If aperiodic SRS triggering is restricted by fixed slot position, then system complexity is reduced, but transmission flexibility deteriorates
Solution Approach 1:
The patent introduces dynamic slot offset indication through DCI, allowing the SRS transmission slot position to be adjusted dynamically based on current system conditions. This transforms the fixed slot position triggering mechanism into a flexible one that can adapt to dynamic uplink-downlink configurations while maintaining relatively simple triggering logic.
Solution Approach 2:
The patent changes the slot offset parameter in aperiodic SRS triggering from a fixed value to a dynamically indicated value through DCI. The indication field allows the network to specify different offset values (0, 1, 2 slots) to adapt to different scheduling scenarios, transforming a rigid triggering mechanism into a flexible one.
Data Source
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AI summary
Provided are a wireless communication method and device. The method comprises: receiving first control information sent by a second device, the first control information comprising a first domain for indicating that a first device is triggered to perform aperiodic sounding reference signal (SRS) transmission based on at least one SRS resource group; and for a first SRS resource group in at least one SRS resource group, performing aperiodic SRS transmission in a first target time slot based on the first SRS resource group, the first SRS resource group being an SRS resource group for which at least one time slot offset is configured in the at least one SRS resource group, the first control information further comprising a second domain for indicating a first time slot offset corresponding to the first SRS resource group in the at least one time slot offset.