Multi-Panel PRACH Positioning Antenna Power Allocation
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Solution Overview
Problem
Current antenna configurations for positioning in New Radio (NR) networks face challenges in achieving accurate positioning, low latency, and efficient power consumption, especially in idle/inactive modes where PRACH positioning methods may not effectively reach all necessary gNBs.
Innovation Solution
The proposed solution involves a method where a UE identifies hearable gNBs based on reference signal monitoring, determines transmit power for multiple antenna panels, and transmits positioning messages using these panels to maximize coverage and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single antenna panel is used for PRACH transmission in idle/inactive mode, then device complexity is reduced, but positioning accuracy and coverage are insufficient
Solution Approach 1:
The antenna system is segmented into multiple independent antenna panels, each capable of transmitting PRACH signals independently. The UE determines transmit power for each panel separately based on reference signal measurements, allowing optimized positioning coverage without requiring a single complex antenna system.
Solution Approach 2:
The transmit power for each antenna panel is dynamically determined based on real-time reference signal measurements from hearable gNBs. This dynamic power adjustment allows the system to adapt to changing channel conditions and optimize positioning accuracy without fixed complex configurations.
2Measurement precision
If transmit power is increased for PRACH transmission, then positioning accuracy improves, but power consumption increases
Solution Approach 1:
Instead of uniformly increasing power across all antenna panels, the UE applies different transmit power levels to different antenna panels based on their specific reference signal measurements. This localized power optimization ensures sufficient positioning accuracy is achieved while minimizing overall power consumption by only transmitting at high power where necessary.
3Area of stationary object
If multiple antenna panels are used for PRACH transmission, then coverage and positioning accuracy improve, but device complexity increases
Solution Approach 1:
The antenna system is divided into multiple independent panels that can be configured and controlled separately. Each panel's transmit power is independently determined based on reference signal measurements, allowing the system to achieve extended coverage through simple power control rather than complex panel coordination.
4Measurement precision
If reference signal monitoring is performed for all gNBs, then positioning accuracy improves, but latency increases
Solution Approach 1:
The UE performs reference signal monitoring and identifies only the subset of gNBs that are hearable (excessive action), then uses only those identified gNBs for positioning calculations. This partial action approach achieves sufficient positioning accuracy by focusing on relevant gNBs rather than all possible gNBs, reducing processing latency.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of antenna configuration for positioning. The method comprises identifying, at a first device, at least one second device hearable by the first device based on a monitoring of respective reference signals from the at least one second device; determining respective transmit power on at least two antenna panels allocated for the at least one second device based on a measurement associated with the respective reference signals; and transmitting, to the at least one second device, a message associated with a positioning of the first device by using the at least two antenna panels with the respective transmit power. In this way, the chance of successful PRACH for positioning reception at all identified involved gNBs may be optimized for maximized positioning accuracy at low latency and low UE power consumption.