Wireless Device Interference Adaptation via Network Node Signaling
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Solution Overview
Problem
Coverage enhancing devices (CEDs) like smart repeaters and reflective intelligent surfaces cause increased interference in wireless communication systems due to parasitic reflections, affecting communication quality, especially when they apply gain to reflected signals.
Innovation Solution
A method where network nodes inform wireless devices about changes in interference states, allowing them to adapt their interference measurements and compute an interference covariance matrix to mitigate interference impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coverage enhancing devices (CEDs) are used to improve signal coverage, then coverage enhancement is achieved, but interference levels increase due to parasitic reflections
Solution Approach 1:
The network node transmits a message to the wireless device in advance to indicate that a change of interference state will occur. This allows the wireless device to prepare and adapt its interference measurements before the actual interference change happens, mitigating the harmful effects of parasitic reflections from CEDs while maintaining coverage enhancement benefits
2Reliability
If CEDs apply gain to reflected signals, then signal coverage is improved, but interference impact is amplified
Solution Approach 1:
The system implements a feedback mechanism where the network node monitors interference state changes and communicates these changes to wireless devices. The wireless devices use this feedback information to adapt their interference measurements and computations, allowing them to compensate for the amplified interference caused by CED gain while still benefiting from the coverage enhancement
3Reliability
If wireless devices continuously measure interference, then interference mitigation is improved, but communication performance degrades due to computational overhead
Solution Approach 1:
Instead of continuous interference measurement, the system uses periodic action triggered by network node messages. When the network node detects a change in interference state, it sends a message to wireless devices, which then update their interference measurements. This periodic approach reduces computational overhead and maintains communication performance while still achieving effective interference mitigation through the interference covariance matrix computation
Data Source
AI summary
A method is disclosed performed by a network node of a communications network, for improving communication by a wireless device, WD. The method comprises transmitting, to the WD, a message indicating that a change of an interference state in the communications network will occur.