Autonomous Muting for Accurate OTDOA Positioning
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Solution Overview
Problem
User communication devices face difficulties in accurately measuring the observed time difference of arrival (OTDOA) of positioning reference signals from neighbor base stations due to interference from the serving base station, particularly when the device is near the serving base station, leading to inaccurate position determination.
Innovation Solution
Implementing autonomous muting of the serving base station's positioning reference transmission in certain subframes, allowing the user equipment to take accurate OTDOA measurements from neighbor base stations, and providing an autonomous muting status indication to the user device to differentiate between actual signals and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the serving base station continuously transmits positioning reference signals, then the user equipment can maintain continuous communication coverage, but the measurement precision of OTDOA from neighbor base stations deteriorates due to interference
Solution Approach 1:
The serving base station implements periodic muting of positioning reference signals at specific time instances, creating intermittent transmission patterns. This allows the user equipment to periodically measure OTDOA from neighbor base stations without continuous interference from the serving base station, while maintaining communication coverage during non-muting periods
Solution Approach 2:
The harmful interference component (serving base station positioning reference signals) is extracted and removed at specific time instances through muting. This separates the interference source from the measurement process, enabling clean OTDOA measurements from neighbor base stations while preserving communication functionality
2Power
If the serving base station transmits positioning reference signals at high power, then the signal strength for communication is improved, but the harmful interference to neighbor base station measurements increases
Solution Approach 1:
The serving base station applies periodic muting to its positioning reference signals, creating time instances where transmission is suspended. During non-muting periods, full power transmission maintains communication coverage, while during muting periods, interference to neighbor measurements is eliminated, achieving a temporal separation of these conflicting requirements
Data Source
AI summary
A method, user communication device, and a base station are disclosed. A transceiver 302 may receive a serving transmission from a serving base station. A processor 304 may make a status determination of an autonomous muting status of a neighbor base station based on the serving transmission.