Interference Estimation for Moving Conveyance Downlink Communications
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Solution Overview
Problem
In wireless telecommunications, accurately estimating interference from both on-board and wayside interferers poses a challenge for maintaining effective downlink communications in moving conveyances, as existing methods require differentiation between these sources of interference, which complicates the interference estimation process.
Innovation Solution
A method that combines observations of interference from multiple journeys to predict interference on a given path segment by compensating for on-board and wayside interferer contributions, using processing devices to merge and analyze interference data stored in a fingerprint map, allowing for interference estimation without distinguishing between the two types of interferers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference observations from multiple journeys are combined to estimate interference, then measurement precision is improved, but device complexity increases due to the need to store and process multiple observation sets
Solution Approach 1:
The system performs preliminary actions by collecting and storing interference observations from multiple previous journeys in a fingerprint map before the actual interference estimation is needed. This pre-collection of data allows the estimation process to simply retrieve and combine pre-existing observations rather than conducting complex real-time measurements, thereby improving precision without proportionally increasing processing complexity during operation.
2Reliability
If interference data from multiple journeys is stored and processed, then reliability of interference estimation is improved, but loss of time increases due to data retrieval and processing requirements
Solution Approach 1:
Interference observations from multiple journeys are collected and stored in advance in a fingerprint map structure during periods when the moving conveyance is not requiring interference estimation. This preliminary data collection ensures that when interference estimation is actually needed, the system can quickly retrieve pre-processed data without time-consuming real-time measurements, thus improving reliability while minimizing time loss.
3Measurement precision
If observations from multiple journeys are combined to compensate for interferer contributions, then measurement precision is improved, but device complexity increases due to combination processing requirements
Solution Approach 1:
The system performs preliminary separation and characterization of interferer contributions during the data collection phase, organizing observations by journey and interferer type in the fingerprint map. This preliminary organization allows the combination process to simply retrieve pre-characterized data and apply straightforward mathematical operations rather than performing complex separation algorithms in real-time, improving precision while limiting complexity increases.
Data Source
Figure 1~2
Figure 3~4B
Figure 4C~4F
AI summary
For estimating interference expected to be encountered by downlink communications toward a communication device located inside a moving conveyance moving over a path, the interference being expected to be encountered due to presence of wayside interferers and presence of on-board interferers, a processing device: obtains first observations of interference performed during at least one first journey for at least one first portion of said path; obtains second observations of interference performed during the first journey(s) for a second portion of said path; obtaining third observations of interference performed during a second journey for said first portion(s); estimating the interference expected to be encountered on said second portion during said second journey, by combining the obtained first, second and third observations such that the part of the third observations related to interference induced by wayside interferers is substantially compensated by the first observations and the part of the second observations related to interference induced by on-board interferers is substantially compensated by the first observations.