UE Measurement Gap Scheduling for 5G Positioning Latency
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Solution Overview
Problem
Current wireless positioning systems face challenges in efficiently scheduling measurement periods for user equipment (UE) to perform positioning measurements, leading to increased latency and reduced spectral efficiency in 5G networks.
Innovation Solution
A method where a user equipment (UE) receives a location information request from a location server, including a measurement time for a positioning session, and transmits a request for measurement periods with a requested offset and start time to a serving base station, allowing for advanced scheduling of positioning measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If measurement periods are scheduled without advance planning, then scheduling simplicity is maintained, but latency increases and spectral efficiency deteriorates
Solution Approach 1:
The patent implements advance scheduling of positioning measurement periods by having the location server determine measurement time instances before the actual measurements occur. The LPP message includes a measurement time indicator that specifies when the UE should perform measurements, allowing the network to prepare resources in advance and reduce measurement latency without requiring complex real-time scheduling mechanisms.
2Measurement precision
If measurement timing is precisely controlled, then positioning accuracy improves, but scheduling complexity increases
Solution Approach 1:
The patent introduces an LPP (LTE Positioning Protocol) message as an intermediary carrier between the location server and UE. This message conveys the measurement time indicator that precisely specifies when measurements should be performed. The LPP layer handles the complex timing coordination, shielding the physical layer from timing complexity while ensuring precise measurement timing for accurate positioning.
Data Source
AI summary
Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) receives, from a location server, during a location preparation phase of a positioning session, a location information request, the location information request including a measurement time at which the UE is expected to perform one or more positioning measurements during a first location execution phase of the positioning session, and transmits, to a serving base station, a request for measurement periods, the request for measurement periods including a requested offset for one or more measurement periods to perform the one or more positioning measurements and at least a first start time for the one or more measurement periods, wherein the first start time is greater than the requested offset.