Wireless Measurement Reporting for Strong Downlink Interference
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Solution Overview
Problem
Aerial UEs experience strong downlink interference from multiple cells due to line-of-sight propagation, which is not effectively managed by existing LTE measurement reporting mechanisms, leading to decoding failures and network unawareness of interference issues.
Innovation Solution
A method for wireless devices to derive measurement results and transmit reports based on interference thresholds, including information about triggering elements and specific cells or reference signals experiencing strong interference, enabling timely network awareness of downlink interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If LTE measurement reporting mechanism with numberOfTriggeringCells threshold is used, then the number of measurement reports is reduced, but the network becomes unaware of strong downlink interference affecting UE operation
Solution Approach 1:
The measurement reporting mechanism is segmented into two independent triggering conditions: (1) the existing numberOfTriggeringCells threshold for cell quantity, and (2) a new strong interference threshold for interference level. This allows the system to separately detect cell count issues and interference issues, enabling the network to receive targeted reports about strong downlink interference without requiring complete restructuring of the measurement reporting framework.
Solution Approach 2:
The UE performs preliminary interference level checks on specific cells or reference signals before sending measurement reports. By deriving measurement results and comparing them against the strong interference threshold in advance, the UE can proactively identify and report interference conditions, allowing the network to take preventive actions before decoding failures occur.
2Loss of information
If the number of triggering cells threshold is increased to allow more measurement reports, then the network gains more interference awareness, but the signaling overhead and network load increase
Solution Approach 1:
Instead of using a uniform threshold approach for all cells, the patent applies a specific strong interference threshold to particular cells or reference signals that are suspected of causing interference. This localized quality check allows the UE to selectively report only when specific interference conditions are met, providing targeted interference information without generating excessive measurement reports for all cells.
Solution Approach 2:
The strong interference threshold acts as an intermediary filtering mechanism between the raw measurement data and the measurement reports sent to the network. By introducing this intermediate comparison step, the system filters out normal variation and only reports when actual strong interference conditions exist, reducing unnecessary reporting while maintaining interference awareness.
3Reliability
If measurement reports are sent frequently to inform the network of interference conditions, then the network can respond timely, but the UE power consumption and signaling overhead increase
Solution Approach 1:
The UE performs interference level checks periodically by deriving measurement results for specific cells or reference signals and comparing them against the strong interference threshold at defined intervals. This periodic monitoring approach ensures the network is informed of interference conditions timely while avoiding continuous reporting that would excessively consume UE power and generate unnecessary signaling overhead.
Data Source
AI summary
A method and an apparatus for measurements reporting based on interference information in a wireless communication system is provided. The method comprises: deriving measurement results for a certain measurement object related to a certain measurement ID; and based on (i) comparison between a number of triggering elements based on the measurement results and the threshold number and (ii) interference of a specific cell or a specific reference signal included in the certain measurement object being equal to or greater than the strong interference threshold based on the measurement results, transmitting a measurement report including (i) information related to the triggering elements and/or (ii) information related to the specific cell or the specific reference signal.