Multi-Port Positioning Feedback for Earliest Effective Beam Detection
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G networks, face challenges in efficiently determining the location of mobile devices due to limitations in measuring and utilizing multi-port positioning signals, which are crucial for applications such as emergency calls and asset tracking.
Innovation Solution
The system employs user equipment to measure multi-port positioning signals, apply multiple steering vectors to determine the earliest-arriving effective beam, and report information including the angle of departure, using co-phasing factors and steering matrix indices to enhance location determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-port positioning signals are measured and processed using multiple steering vectors, then location determination accuracy is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent segments the positioning signal processing by dividing the multi-port signals into multiple steering vectors, each representing different spatial directions. The user equipment processes each steering vector separately to determine angle of departure information, which improves location accuracy while managing complexity through structured decomposition of the processing task
Solution Approach 2:
The patent introduces angle of departure (AoD) information as an intermediary parameter that bridges the multi-port signal measurements and final location determination. By extracting and reporting AoD information through feedback channels, the system improves location accuracy without requiring the network side to perform complex direct calculations on raw multi-port signals
2Measurement precision
If multiple steering vectors are applied to determine earliest-arriving effective beam, then positioning accuracy is improved, but measurement and processing time increases
Solution Approach 1:
The patent performs preliminary processing by having the user equipment measure and process all multi-port positioning signals and determine angle of departure information in advance, before the network side performs final location calculation. This preliminary action at the user equipment side enables faster overall positioning by preparing data locally rather than requiring complex real-time processing at the network side
3Loss of information
If angle of departure information is reported using co-phasing factors and steering matrix indices, then information efficiency is improved, but signaling complexity increases
Solution Approach 1:
The patent uses predefined steering matrices as reference templates, where the user equipment reports indices pointing to specific steering vectors in these matrices rather than reporting raw angle measurements. This copying approach allows efficient representation of angle of departure information using standardized reference data, reducing information loss while managing signaling through index-based reporting
Data Source
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AI summary
A UE includes: a transceiver configured to receive positioning signals from a positioning-signal source; a memory; and a processor communicatively coupled to the transceiver and the memory, the processor configured to: measure a plurality of the positioning signals, from a plurality of ports, spanning a collection of Orthogonal Frequency Division Multiplexed symbols to obtain a plurality of multi-port measurements; determine, based on the plurality of multi-port measurements, that a particular effective beam corresponds to an earliest time of arrival from the positioning-signal source to the UE of a plurality of effective beams associated with the plurality of ports; and send, via the transceiver to a first network entity, a beam indication indicative of the particular effective beam.