PRS Frequency Hopping for RedCap UE Positioning
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in accurately positioning user equipment (UE) with reduced capacity, as conventional PRS configurations are not adaptable to the limited bandwidth capabilities of RedCap UEs, leading to suboptimal positioning precision.
Innovation Solution
Implementing PRS frequency hopping with specified time gaps between hops, allowing RedCap UEs to retune their RF circuits, and flexible resource allocation in the time and frequency domains to support wider bandwidths than the UE can handle, enhancing positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PRS configurations are used, then system compatibility is maintained, but positioning precision deteriorates for RedCap UEs with limited bandwidth capabilities
Solution Approach 1:
The patent segments the PRS resource allocation into multiple smaller resource blocks that can be distributed across different frequency hops. Instead of allocating a large continuous bandwidth that RedCap UEs cannot handle, the PRS resources are divided into manageable segments that can be received and processed by UEs with limited bandwidth capabilities, thereby improving positioning precision for RedCap UEs while maintaining system compatibility
Solution Approach 2:
The patent changes the bandwidth parameter of PRS allocation dynamically based on UE capabilities. For RedCap UEs with limited bandwidth, the system allocates smaller bandwidth resources and uses frequency hopping to achieve wider effective bandwidth coverage. This parameter adaptation allows positioning precision to be improved for RedCap UEs without requiring changes to the overall system architecture
2Measurement precision
If PRS frequency hopping is implemented to support wider bandwidths, then positioning accuracy improves, but device complexity increases
Solution Approach 1:
The patent implements periodic frequency hopping where PRS transmissions occur at regular intervals across different frequency resources. This periodic structure allows RedCap UEs to systematically retune their RF circuits between predetermined frequency hops, making the complexity manageable through predictable timing patterns while achieving wider effective bandwidth for improved positioning accuracy
Solution Approach 2:
The patent specifies predetermined frequency hop patterns and time gaps in advance, allowing RedCap UEs to prepare for frequency retuning beforehand. By providing advance notice of frequency changes through pre-configured hopping patterns, the UE can efficiently manage RF circuit retuning without unexpected complexity, thereby enabling wider bandwidth utilization for improved positioning accuracy
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a network entity, such as a location server or base station, may determine a positioning reference signal (PRS) frequency hopping configuration that specifies a plurality of PRS hops within a PRS resource set, each PRS hop occupying a specified set of one or more contiguous physical resource blocks, and further specifying a time gap between PRS hops to allow a sufficient retuning gap for a user equipment (UE) with reduced BW capability and/or relaxed processing time. The network entity may transmit the PRS frequency hopping configuration to at least one UE, e.g., via broadcast, multicast, groupcast, or unicast over Uu or PC5 links. The pre-configured time gap between PRS hops allows a reduced capacity UE to retune its RF circuit and thus allow PRS measurements over a larger bandwidth than what the UE can support without frequency hopping.