Interference Reporting for Hidden Node Detection in Wireless Networks
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Solution Overview
Problem
In wireless communication networks, particularly in LTE and WLAN systems using LBT, hidden nodes can cause transmission interference due to the lack of visibility between nodes, leading to data packet collisions and corruption, as the base station may not detect interference that the mobile device experiences, disrupting LBT operations.
Innovation Solution
A method where a mobile device measures interference and reports it to the network, including an indication of the time of measurement, allowing the network to determine the presence of hidden nodes and potentially reconfigure channels to mitigate interference, such as switching to a different channel or identifying the hidden node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station performs interference measurement independently, then the device complexity is reduced, but the measurement precision is insufficient to detect hidden node interference
Solution Approach 1:
The patent merges the interference measurement capabilities of the base station and mobile device by having the mobile device measure interference and report it to the base station. This combination allows the network to achieve more precise interference detection (including hidden node interference) without requiring each individual device to have complete measurement capabilities, thus resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The mobile device acts as an intermediary that measures interference at its location and reports this information to the base station. This intermediary measurement provides the base station with localized interference data that it cannot obtain independently, improving overall measurement precision while keeping the base station relatively simple.
2Measurement precision
If the mobile device reports all interference measurements, then the measurement precision improves, but the loss of time increases due to frequent reporting
Solution Approach 1:
Instead of reporting all interference measurements, the patent applies partial action by having the mobile device report only when interference exceeds a threshold or changes significantly. This selective reporting maintains measurement precision for critical events while reducing the frequency of reports, thus minimizing time loss.
Solution Approach 2:
The base station pre-configures the mobile device with reporting criteria and thresholds before measurements begin. This preliminary configuration allows the mobile device to make autonomous decisions about when to report, reducing the need for continuous communication and minimizing time loss while maintaining precision for relevant events.
3Reliability
If the network reconfigures channels to mitigate interference, then the reliability improves, but the productivity decreases due to channel switching
Solution Approach 1:
The patent implements dynamic channel reconfiguration where the base station adjusts channels based on real-time interference reports from mobile devices. This dynamic approach allows the network to maintain high reliability by adapting to changing interference conditions while minimizing productivity loss by only reconfiguring when necessary, rather than using static or overly frequent reconfiguration.
Data Source
AI summary
A method of operating a mobile device in a wireless communication network, the method comprising measuring interference at the mobile device, determining whether to report the measured interference to the network, and, if it is determine to report the measured interference to the network, transmitting an interference measurement report to the network including an indication of the time interference was measured. Also described is a method of operating a network node in a wireless communication network.