UE-BS-LMF Capability Exchange for RAT-Dependent Positioning Integrity
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Solution Overview
Problem
There is a lack of support for integrity monitoring and capability transfer in radio access technology (RAT)-dependent positioning, which is essential for ensuring the trustworthiness and reliability of positioning systems, particularly in 3GPP Rel-17, where GNSS positioning integrity is supported but RAT-dependent positioning integrity is not.
Innovation Solution
A system and method for RAT-dependent positioning integrity involving UE, BS, and LMF entities, including capability transfer procedures, integrity monitoring, and information exchange using standardized signaling protocols like LPP and NRPPa, to ensure accurate and reliable positioning integrity assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GNSS positioning integrity is supported in 3GPP Rel-17, then positioning integrity for satellite-based systems is improved, but positioning integrity for RAT-dependent positioning methods remains unsupported
Solution Approach 1:
The patent extends the positioning integrity framework to support multiple positioning methods including both GNSS and RAT-dependent positioning (ECID, TDOA, RTT). The LMF and BS are configured to handle capability transfer and integrity monitoring for different RAT-dependent positioning methods, making the system universal across various positioning technologies rather than limited to GNSS only
2Reliability
If capability information exchange is implemented for RAT-dependent positioning integrity, then positioning reliability is improved, but signaling complexity between UE, BS, and LMF increases
Solution Approach 1:
The capability information exchange is segmented into distinct phases: UE capability reporting to BS, BS capability reporting to LMF, and LMF capability reporting to UE. Each entity has specific capability attributes (supported positioning methods, integrity monitoring capabilities, measurement capabilities) that are exchanged separately through standardized interfaces (LPP, NRPPa), organizing the complexity into manageable segments
3Reliability
If integrity monitoring and reporting is implemented for RAT-dependent positioning, then positioning trustworthiness is improved, but system complexity and processing overhead increase
Solution Approach 1:
The LMF acts as an intermediary that centralizes integrity monitoring and evaluation functions. The LMF receives capability information from both UE and BS, performs integrity assessments based on supported positioning methods and measurement capabilities, and generates integrity results that are returned to the appropriate entities. This mediator approach consolidates complex integrity processing in one location rather than distributing it across multiple entities
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for radio access technology (RAT) dependent positioning integrity. According to an embodiment of the present disclosure, a user equipment (UE) may include: a receiver configured to receive a request message to request first capability information for RAT-dependent positioning integrity from a base station (BS) or a location management function (LMF); a transmitter configured to transmit a response message including the first capability information to the BS or the LMF; and a processor coupled to the receiver and the transmitter.