RRC-Inactive Mobile Positioning with Validated Assistance Data
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Solution Overview
Problem
Existing positioning methods in mobile communication systems, particularly in RRC_INACTIVE state, lack efficient utilization of validity information and assistance data, leading to suboptimal positioning accuracy and efficiency.
Innovation Solution
The method involves receiving type 1 and type 2 assistance data from a base station, determining the validity of type 2 assistance data using NR cell global identifier, and transmitting ProvideLocationInformation in a MAC PDU with a ResumeRequest in the RRC_INACTIVE state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning is performed in RRC_INACTIVE state without validity information checking, then positioning can be performed, but positioning accuracy deteriorates due to use of invalid assistance data
Solution Approach 1:
The base station performs preliminary validation of assistance data by including validity information (such as validity duration or condition flags) along with the assistance data. This allows the UE to determine in advance whether the assistance data is valid for current positioning, avoiding the use of invalid data without requiring complex real-time validation mechanisms at the UE side.
Solution Approach 2:
Validity information acts as an intermediary element between the base station and UE. This intermediary carries validation status (e.g., whether assistance data is still valid, expired, or conditional) without requiring the UE to implement complex validation logic, thus improving positioning accuracy while maintaining simplicity.
2Productivity
If assistance data is transmitted without validity information, then signaling overhead is reduced, but positioning efficiency deteriorates due to inability to determine data validity
Solution Approach 1:
Instead of transmitting complete validation logic or requiring full re-validation of assistance data, the base station transmits only essential validity indicators (such as validity duration, expiration time, or simple condition flags). This partial information is sufficient for the UE to determine whether to use the assistance data, improving positioning efficiency while minimizing additional signaling overhead.
3Measurement precision
If all assistance data is treated as valid, then positioning can proceed without validation, but positioning accuracy deteriorates due to use of expired or invalid data
Solution Approach 1:
The base station performs the validation action in advance by attaching validity information to the assistance data before transmission. This preliminary validation eliminates the need for time-consuming validation processing at the UE side, allowing the UE to quickly determine data validity and proceed with positioning using only valid assistance data.
4Adaptability or versatility
If positioning is not performed in RRC_INACTIVE state, then system complexity is reduced, but positioning capability is lost for inactive UEs
Solution Approach 1:
Validity information serves as an intermediary that enables positioning capability in RRC_INACTIVE state without requiring complex validation mechanisms at the UE. The base station provides pre-validated assistance data with validity indicators, allowing the UE to perform positioning using simplified logic while maintaining high accuracy, thus achieving adaptability without proportionate complexity increase.
Data Source
AI summary
A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes receiving from a base station a first type1 assistance data, receiving from the base station a type2 assistance data, the type2 assistance data includes a validity information and a second type1 assistance data, determining based on the validity information and a New Radio (NR) cell global identifier of serving cell whether the second typel assistance data is valid, receiving from the base station a RRCRelease, transmitting in RRC_INACTIVE state a ProvideLocationInformation. At least a part of the ProvideLocationInformation is transmitted in a first Medium Access Control (MAC) Protocol Data Unit (PDU) and the first MAC PDU includes a ResumeRequest.