PRS Block Polling for 5G mmWave Positioning
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Solution Overview
Problem
Current 5G millimeter-wave communication systems face challenges in implementing downlink positioning due to the high attenuation and weak diffraction of millimeter waves, which affects the propagation of positioning reference signals (PRS) in beam scanning scenarios.
Innovation Solution
The method involves presetting PRS blocks with corresponding sequences and sending them through shaped beams in a polling manner, where the PRS blocks are indexed and sent according to a specific order, allowing for accurate determination of the time-domain position of the shaped beams for effective downlink positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If millimeter wave is used for high data transmission rate, then communication speed is improved, but signal propagation reliability deteriorates due to serious attenuation and weak diffraction
Solution Approach 1:
The patent segments the positioning reference signal transmission into multiple PRS blocks, each associated with a specific beam index. This segmentation allows the system to transmit positioning signals through multiple directional beams, overcoming the weak diffraction capability of millimeter waves by directing energy along specific paths, thereby improving signal propagation reliability while maintaining high transmission rates.
Solution Approach 2:
The patent employs periodic beam sweeping where PRS blocks are transmitted in a polling manner across different beams according to a preset sending order. This periodic transmission ensures that positioning signals reach the receiver through multiple directional attempts, compensating for signal attenuation and improving propagation reliability in millimeter-wave environments.
2Reliability
If beamforming is used to overcome attenuation, then signal propagation is improved, but device complexity increases due to narrow beam scanning requirements
Solution Approach 1:
The patent applies preliminary action by pre-configuring PRS blocks with associated beam indexes and preset sending orders before transmission. The base station prepares the positioning reference signal structure in advance, mapping each PRS block to specific beams, which simplifies the real-time beam scanning process and reduces device complexity while maintaining effective signal propagation through targeted beamforming.
3Measurement precision
If PRS blocks are sent in polling manner through shaped beams, then positioning accuracy is improved, but time consumption increases due to sequential transmission
Solution Approach 1:
The patent segments positioning reference signals into multiple PRS blocks, each transmitted through different shaped beams in a polling manner. This segmentation enables the receiver to identify which specific beam carried the positioning signal by detecting the beam index associated with each PRS block, thereby improving positioning accuracy through beam-specific measurements while managing time consumption through structured sequential transmission.
Data Source
AI summary
Provided are a positioning reference signal (PRS) transmission method and apparatus, and a storage medium. A PRS sending end presets PRS blocks having the same number as the number of shaped beams, a corresponding PRS sequence in each PRS block by using a preset sequence generation rule, and each PRS block containing the corresponding PRS sequence is sent according to a preset sending order of the PRS blocks in a polling manner through a shaped beam corresponding to the each PRS block. A PRS receiving end acquires a first PRS block sent by the PRS sending end; and when the first PRS block contains a block index, a sending index of a shaped beam corresponding to the first PRS block corresponding to the block index is determined according to preset correspondence; or when the first PRS block contains no block index, a sending index of a shaped beam corresponding to the first PRS block is determined according to a preset calculation rule. The sending index of the shaped beam is used for determining a time-domain position of the shaped beam.