SRS Bandwidth Stitching for RedCap UE Positioning Accuracy
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Solution Overview
Problem
Reduced Capability (RedCap) NR User Equipment (UE) bandwidth limitations affect the accuracy of timing-based positioning methods, necessitating improved techniques for wireless device positioning.
Innovation Solution
Implement bandwidth stitching via one sounding reference signal (SRS) resource set across multiple component carriers (CCs)/bandwidth parts (BWPs) with frequency hopping, allowing for non-zero or zero frequency domain overlaps, and incorporating collision handling mechanisms to optimize SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bandwidth stitching is implemented via frequency hopping across multiple BWPs, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the wide bandwidth into multiple smaller bandwidth parts (BWPs) that can be transmitted through frequency hopping. Instead of transmitting the entire wideband SRS at once, the system segments it into manageable chunks across different BWPs, reducing the complexity burden on RedCap UEs while achieving the same positioning accuracy through aggregated measurements.
Solution Approach 2:
The patent employs periodic frequency hopping across multiple BWPs to transmit SRS resources. By periodically switching between different BWPs in a predetermined sequence, the system achieves wideband coverage over time without requiring the UE to handle the entire bandwidth simultaneously, thus improving positioning accuracy while managing device complexity.
2Measurement precision
If multiple SRS resources are transmitted across different BWPs, then frequency domain resolution is improved, but transmission time duration increases
Solution Approach 1:
The patent configures multiple SRS resources in advance across different BWPs with predetermined frequency hopping patterns. This preliminary configuration allows the UE to prepare transmission parameters beforehand, enabling efficient switching between BWPs without extending the actual transmission time duration, thus maintaining high frequency domain resolution.
3Measurement precision
If SRS transmission is performed with frequency hopping, then positioning accuracy is enhanced, but interference with other uplink transmissions increases
Solution Approach 1:
The patent applies local quality by assigning different SRS resources to specific BWPs with localized frequency hopping patterns. This allows the system to optimize transmission quality in each BWP individually while minimizing interference with other uplink transmissions in different frequency regions, thus enhancing positioning accuracy without causing widespread interference.
Data Source
AI summary
This disclosure describes systems, methods, and devices for configuring sounding reference signal resources across multiple frequency locations for device positioning. A device may encode for transmission a sounding reference signal (SRS) including a first set of SRS resources for a first transmission by a user equipment (UE) device to the node B network device at a first time and a second set of SRS resources for a second transmission by the UE device to the node B network device at a second time; decode the first transmission received from the UE device using the first set and a first bandwidth at the first time; decode the second transmission received from the UE device using the second set and a second bandwidth at the second time; and combine the first transmission and the second transmission for a device positioning estimation based on the first bandwidth and the second bandwidth.