NR Downlink PRS Resource Allocation and Mapping
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately configuring downlink positioning reference signals (PRS) for high-accuracy coordinate estimation in New Radio (NR) systems, particularly in supporting flexible resource allocation and optimizing receiver complexity for positioning services.
Innovation Solution
The configuration of a NR downlink PRS resource pool with a flexible resource allocation structure, including a resource set and single resource element mapping rule, along with a design for a DL PRS sequence generator, optimizes PRS detection and positioning estimation by enabling multiplexing with other DL transmissions and quasi-colocation assumptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flexible resource allocation structure is implemented for DL PRS, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The DL PRS resource pool is segmented into multiple resource sets, where each resource set contains multiple DL PRS resources. This hierarchical segmentation allows the receiver to process positioning signals in organized groups, improving positioning accuracy through structured resource allocation while managing complexity through systematic organization of resource elements, time slots, and frequency resources.
2Productivity
If DL PRS is multiplexed with other DL transmissions, then resource utilization is improved, but signal detection difficulty increases
Solution Approach 1:
DL PRS is multiplexed with other downlink transmissions by combining positioning reference signals with data and control channels in the same time-frequency resources. This merging approach improves resource utilization efficiency while the receiver detects DL PRS resources by identifying specific resource elements within the multiplexed transmission structure, maintaining detection capability despite the combined signal environment.
3Measurement precision
If quasi-colocation assumptions are applied, then positioning estimation accuracy is improved, but configuration complexity increases
Solution Approach 1:
Quasi-colocation assumptions are applied as an intermediary mechanism between different DL PRS resources and other downlink signals. This allows the receiver to infer channel properties from reference signals to improve positioning estimation accuracy, while the configuration complexity is managed through standardized quasi-colocation parameter settings that reduce the burden on both transmitter and receiver implementations.
Data Source
AI summary
Devices and methods provide for transmitting downlink (DL) positioning reference signals (PRSs) in a wireless system. A DL PRS resource pool is configured and divided into a plurality of DL PRS resource sets. The DL PRS resource pool includes a periodically repeated amount of resources dedicated for DL PRS transmission by a plurality of gNBs in the wireless communication system. The plurality of DL PRS resource sets correspond to one or more gNB of the plurality of the gNBs. The DL PRSs are encoded for transmission on configured DL PRS resources within the plurality of DL PRS resource sets.