SRS Frequency Hopping Across BWPs for Narrowband Positioning
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Solution Overview
Problem
Positioning accuracy in narrow band systems is degraded due to low sampling rates, which can be alleviated by implementing PRS/SRS frequency hopping and stitching, but existing methods require inefficient multiple DCI indications for SRS frequency hopping across different bandwidth parts.
Innovation Solution
A method for SRS frequency hopping and stitching across multiple bandwidth parts using a single DCI indication, enabling flexible SRS resource configurations and aperiodic SRS triggering states to optimize positioning accuracy and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple DCI indications are used for SRS frequency hopping across different bandwidth parts, then positioning accuracy can be maintained, but signaling overhead increases and efficiency decreases
Solution Approach 1:
The patent combines multiple DCI indications into a single DCI message that triggers SRS frequency hopping across multiple bandwidth parts. This single DCI contains consolidated signaling information that previously required multiple separate DCI messages, thereby reducing signaling overhead while maintaining the ability to accurately indicate frequency hopping parameters across different BWPs for positioning measurements
2Manufacturing precision
If multiple DCI indications are used for SRS frequency hopping, then frequency hop configuration can be precise, but processing latency increases
Solution Approach 1:
The patent pre-configures SRS resource sets associated with different bandwidth parts and pre-defines the frequency hopping pattern information in a single DCI message. This allows the UE to have all necessary frequency hopping parameters available in advance, enabling immediate execution of frequency hopping without waiting for multiple sequential DCI indications, thus reducing processing latency while maintaining configuration precision
3Device complexity
If narrow band system is used, then device complexity is reduced, but positioning accuracy deteriorates due to low sampling rate
Solution Approach 1:
The patent transitions from single-bandwidth SRS transmission to multi-bandwidth SRS frequency hopping across multiple bandwidth parts. By adding the frequency dimension (hopping across different BWPs) to the SRS transmission, the system achieves higher effective sampling rates for positioning measurements while maintaining the simplicity of narrow-band individual SRS resources. This dimensional expansion allows coherent processing across multiple frequency hops to improve positioning accuracy without increasing individual resource complexity
Data Source
AI summary
Example embodiments of the present disclosure relate to positioning enhancements. A first device receives, from a second device providing a serving cell for the first device, a configuration of a plurality of SRS triggering states associated with a plurality of SRSs on a group of bandwidth parts. The first device receives, from the second device, an indication of a target triggering state of the plurality of SRS triggering states. The first device then transmits, based on the target triggering state, the plurality of SRSs on at least a part of the group of bandwidth parts sequentially. In this way, SRS transmissions across multiple SRS resources or SRS resource sets withing multiple BWPs can be triggered in a frequency hopping manner via single DCI, which reduces the signaling overhead and latency, and improve the positioning efficiency.