UE Positioning via Internal Delay and CE Level Signaling
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Solution Overview
Problem
Existing mobile devices face accuracy issues in positioning due to varying RF front-end designs causing internal delays in Radio Frequency receiver paths, and coverage enhancement modes increase measurement time, potentially leading to failure in locating the device.
Innovation Solution
A UE is configured to share its current CE Level and internal delay with the E-SMLC via LPP messages, allowing the E-SMLC to measure RTT and estimate the capability to obtain RSTD measurements within required response times by subtracting internal delays from measured RTT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If coverage enhancement mode is used to extend wireless coverage to mobile devices in remote locations, then wireless coverage is improved, but the time taken to complete and send back measurement results increases
Solution Approach 1:
The system performs preliminary actions by having the UE report its CE level and internal delay information in advance through LPP messages. The E-SMLC uses this information to pre-calculate adjusted response times that account for the additional delays introduced by coverage enhancement mode, allowing the system to prepare appropriate timing parameters before actual measurements begin.
Solution Approach 2:
The system dynamically adjusts the response time parameters based on the UE's operating conditions. When CE mode is detected, the E-SMLC modifies the response time requirements to accommodate the increased measurement duration, creating a dynamic timing system that adapts to different coverage scenarios rather than using fixed time limits.
2Measurement precision
If internal delay information is exchanged between UE and E-SMLC to improve positioning accuracy, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent leverages the existing LPP (LTE Positioning Protocol) message framework to carry multiple types of information including CE level, internal delay values, and capability indicators. By making these existing messages multi-functional, the patent avoids creating entirely new signaling protocols, thereby improving positioning accuracy while minimizing the increase in system complexity.
Solution Approach 2:
The UE autonomously determines and reports its own CE level and internal delay characteristics to the E-SMLC. This self-service approach allows the network to obtain necessary calibration information without requiring complex network-side measurement or probing procedures, reducing overall system complexity while enabling accurate delay compensation.
Data Source
AI summary
Apparatuses and methods for user equipment (UE) positioning are disclosed based on a coverage enhancement level or internal signaling delay for the UE. In one embodiment, a method at a UE may include receiving a request capabilities message from a server, determining one or more capabilities of the UE, where the one or more capabilities include at least one of information for at least one internal signaling path of the UE or information for a coverage enhancement level of the UE, sending a first response message to the server, where the first response message includes the one or more capabilities of the UE, receiving a request for location measurements from the server based at least in part on the one or more capabilities of the UE, obtaining the location measurements, and sending a second response message to the server, where the second response message comprises the location measurements.