PRS Frequency Allocation Across BWPs for Accurate UE Positioning
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Solution Overview
Problem
Conventional techniques for assigning resources to positioning reference signals in wireless communications systems are deficient when dealing with UEs having varying bandwidth capabilities, leading to inefficient tracking and configuration of uplink and downlink PRS transmissions.
Innovation Solution
A wireless communications system that supports bandwidth part (BWP) considerations for uplink and downlink positioning reference signals by configuring a PRS resource that overlaps with one or more active BWPs for UEs, allowing for flexible resource allocation based on UE capabilities, and enabling accurate positioning estimation through PRS measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional resource assignment techniques are used for positioning reference signals, then resource allocation is simple, but positioning accuracy and tracking efficiency deteriorate for UEs with varying bandwidth capabilities
Solution Approach 1:
The patent changes the parameter of frequency domain allocation by introducing a new reference point (point A) within the carrier bandwidth that is independent of BWP configurations. This allows the PRS resource allocation to be defined by absolute frequency coordinates rather than relative BWP coordinates, enabling accurate positioning measurements for UEs with different bandwidth capabilities without requiring complex per-UE customization of the reference signal structure
Solution Approach 2:
The patent creates a universal reference point (point A) that serves all UEs regardless of their BWP configurations or bandwidth capabilities. This single reference point enables the same PRS resource allocation mechanism to function correctly for both narrowband and wideband UEs, eliminating the need for separate configuration schemes and reducing overall system complexity while improving measurement consistency
2Productivity
If PRS resources are configured to overlap with active BWPs for all UEs, then positioning tracking efficiency improves, but resource allocation complexity increases
Solution Approach 1:
The patent changes the allocation parameters from BWP-relative to carrier-relative by defining the frequency domain allocation as an absolute number of resource blocks starting from point A within the carrier bandwidth. This transformation allows the network to configure PRS resources that automatically overlap with active BWPs of different UEs based on their individual capabilities, improving tracking efficiency without requiring complex per-UE allocation logic
Solution Approach 2:
The patent establishes point A as a predetermined reference point within the carrier bandwidth before BWP configurations are applied. This preliminary definition of the reference point enables subsequent PRS resource allocations to be made efficiently without requiring real-time calculation or complex coordination between BWP management and PRS configuration, thereby improving tracking efficiency while keeping configuration complexity manageable
3Ease of operation
If frequency domain allocation is defined relative to BWP start, then configuration is simple, but positioning measurement accuracy deteriorates for UEs with different bandwidth capabilities
Solution Approach 1:
The patent changes the reference parameter from BWP start position to a dedicated point A within the carrier bandwidth. This parameter change decouples the PRS frequency domain allocation from BWP-specific coordinates, allowing consistent and accurate positioning measurements across UEs with different bandwidth capabilities while maintaining configuration simplicity through the use of a single reference point for all UEs
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indication of a positioning reference signal configuration of a base station. The UE may determine, based on the positioning reference signal configuration, a reference point within a carrier bandwidth of a component carrier and a frequency domain allocation for a positioning reference signal relative to the reference point. The UE may transmit the positioning reference signal or measure the positioning reference signal based on the frequency domain allocation.