5G Positioning Assistance Data Request Mechanism

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Solution Overview

Problem

In 5G mobile communication systems, there is a challenge in accurately and efficiently providing positioning assistance data, particularly for terminal positioning in IoT networks, where existing techniques do not effectively support high data rates and low latency requirements, especially in scenarios involving beamforming, MIMO, and array antennas.

Innovation Solution

The solution involves receiving and transmitting specific scheduling information, capability information related to PRS and SRS, and requesting and providing positioning assistance data, including physical cell identity and PRS data, between the terminal, base station, and LMF, to enable accurate positioning measurements even in RRC_INACTIVE states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If positioning assistance data is provided using existing techniques in 5G systems, then basic positioning functionality is supported, but positioning accuracy and efficiency are insufficient for high data rate and low latency requirements

Engineering Contradiction:

Improvepositioning accuracyVSAvoidpositioning efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The positioning assistance data is segmented into multiple types including PRS (Positioning Reference Signal) data, SRS (Sounding Reference Signal) data, and scheduling information. The terminal selectively requests and receives only the necessary segments based on its current state and positioning requirements, improving both accuracy and efficiency by avoiding unnecessary data transmission.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network pre-configures positioning assistance data including PRS and SRS parameters, scheduling information, and capability indicators before the terminal needs them. This preliminary preparation enables faster positioning responses when required, addressing the low latency requirement while maintaining high accuracy through pre-optimized data structures.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If comprehensive positioning assistance data is transmitted to support all positioning scenarios, then positioning accuracy is improved, but data transmission overhead and latency increase

Engineering Contradiction:

Improvepositioning accuracyVSAvoiddata transmission latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The positioning assistance data is customized according to the terminal's specific needs and current operational state. The network determines which PRS and SRS data to provide based on terminal capability information and service requirements, delivering locally optimized data quality rather than uniform comprehensive data, thus reducing latency while maintaining necessary accuracy.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The terminal requests only the partial set of positioning assistance data necessary for its current positioning requirements rather than receiving all possible data. This selective approach reduces transmission overhead and latency while providing sufficient accuracy for the specific positioning scenario at hand.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If positioning measurements are performed in RRC_INACTIVE state, then positioning efficiency is improved by avoiding connection establishment, but positioning accuracy may be compromised due to limited data availability

Engineering Contradiction:

Improvepositioning efficiencyVSAvoidpositioning accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The terminal in RRC_INACTIVE state autonomously performs positioning measurements using pre-configured PRS and SRS data stored in its context. The terminal self-manages the positioning process without requiring connection establishment, thereby maintaining high efficiency. The accuracy is preserved through careful pre-configuration of positioning parameters before entering inactive state.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

All necessary positioning assistance data including PRS configurations, SRS parameters, and measurement objectives are pre-configured and stored in the terminal's AS context before transitioning to RRC_INACTIVE state. This preliminary preparation enables accurate positioning measurements to be performed autonomously in inactive state without sacrificing precision despite the limited data availability during the inactive period.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250097890A1Method and apparatus for requesting positioning assistance data in mobile wireless communication system

Publication Date: 2025.03.20 DOLBY INTERNATIONAL AB

AI summary

A method for positioning in a mobile communication system are provided. Method for positioning includes receiving from a base station a SIB1 comprising a first scheduling information and a second scheduling information, acquiring a SI, transmitting to the base station a UECapabilityInformation the UECapabilityInformation includes a capability information related to PRS, transmitting to a LMF a provideCapabilities including a capability information related to SRS, transmitting to the LMF a RequestAssistanceData comprising a physical cell identity of Primary Cell (PCell) and a second identifier related to a second PRS data of the one or more second PRS data, receiving from the LMF a ProvideAssistanceData including a first PRS data the first PRS data includes a first identifier and one or more nr-DL-PRS-ResourceSet, receiving a RRCRelease including an information related to SRS transmission in RRC_INACTIVE, transmitting a positioning SRS in RRC_INACTIVE state and transmitting to the LMF a ProvideLocationInformation.