Multi-Carrier SRS Aggregation for Coherent Uplink Positioning
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Solution Overview
Problem
Current systems limit the performance of uplink timing-based positioning due to the restricted bandwidth of sounding reference signals (SRS) for positioning, even when user equipment (UE) has sufficient power, and the New Radio (NR) system does not enable coherent combining of SRS across multiple carriers.
Innovation Solution
Configure and aggregate SRS resources across multiple uplink carriers, ensuring they are linked for bandwidth aggregation, using the same timing advance value and transmit power, and utilize signaling for coordinated transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS for positioning is transmitted within each uplink bandwidth part of each uplink carrier, then the system maintains current operation, but the bandwidth of SRS for positioning is limited and positioning performance is restricted
Solution Approach 1:
The patent combines SRS resources from multiple uplink carriers to form an aggregated bandwidth resource. The network configures the UE to transmit SRS on multiple carriers simultaneously, and the base station coherently combines these SRS transmissions to create an equivalent larger bandwidth for positioning measurements, thereby resolving the bandwidth limitation in single-carrier systems.
2Area of stationary object
If the UE transmits multiple SRS for positioning in multiple uplink carriers, then more bandwidth resources are available, but the NR system does not enable coherent combining of SRS across carriers
Solution Approach 1:
The patent implements a feedback mechanism where the network configures the UE with specific SRS resource settings across multiple carriers, and the base station provides coherent combining of the received SRS transmissions. This structured approach manages system complexity by establishing clear configuration and processing rules for multi-carrier SRS aggregation.
3Measurement precision
If SRS for positioning is transmitted with limited bandwidth, then power consumption is reduced, but positioning performance is limited
Solution Approach 1:
The patent merges SRS transmissions across multiple carriers to achieve larger effective bandwidth for positioning. By combining resources from multiple carriers, the system improves positioning accuracy without requiring the UE to transmit high-power signals on a single carrier, thus managing power consumption more efficiently.
Data Source
AI summary
A method of sounding reference signal (SRS) resource allocation, by a user equipment (UE) includes being configured by a base station with a first uplink (UL) carrier and a second UL carrier and being indicated by the base station that a first SRS resource in the first UL carrier and a second SRS resource in the second UL carrier are aggregated with bandwidth.