Full-Duplex Jamming Signal Power Control for Security
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Solution Overview
Problem
In wireless communications, full-duplex devices face challenges in securing communications from aggressor UEs that attempt to intercept downlink messages, as existing techniques do not effectively balance security with self-interference, leading to potential data breaches and reliability issues.
Innovation Solution
A full-duplex capable UE transmits a jamming signal in overlapping time and frequency resources to secure messages from a base station, using a jamming signal power scheme that adjusts transmit power to balance self-interference and security, by identifying aggressor UEs and determining optimal transmit power based on path loss and self-interference thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full-duplex UE transmits a jamming signal to an aggressor UE using maximum power, then security against eavesdropping is improved, but self-interference at the full-duplex UE increases causing reliability degradation
Solution Approach 1:
The patent dynamically adjusts the transmit power of the jamming signal based on channel conditions, aggressor UE location, and self-interference measurements. Instead of using fixed maximum power, the system modifies the power parameter in real-time to achieve optimal security while maintaining acceptable self-interference levels at the full-duplex UE
Solution Approach 2:
The system implements dynamic power control where the jamming signal power is continuously adapted based on feedback from the network and measurements of self-interference. The transmit power is adjusted according to changing channel conditions and aggressor positions, transforming a static maximum power approach into a dynamic optimization process
2Reliability
If a full-duplex UE transmits a jamming signal in overlapping time and frequency resources, then security against eavesdropping is improved, but self-interference increases causing message decoding failures
Solution Approach 1:
The patent applies spatial filtering and directional beamforming to concentrate the jamming signal specifically toward the aggressor UE while minimizing interference in other directions. By making the jamming signal directional rather than omnidirectional, the system achieves localized security protection without broadly affecting the full-duplex UE's ability to decode its own messages
Solution Approach 2:
The system introduces spatial filtering and beamforming techniques as intermediary mechanisms that separate the jamming signal from the received signal in the spatial domain. These intermediaries allow the full-duplex UE to distinguish between the desired downlink message and the self-interference from the jamming signal, enabling successful decoding despite simultaneous transmission
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, a control signal scheduling the UE to receive a downlink message from the base station using a set of time and frequency resources. The UE may identify an aggressor UE attempting to receive uplink communications, downlink communications, or both, transmitted between the UE and the base station and determine a transmit power for transmitting a jamming signal to the aggressor UE during the set of time and frequency resources. The UE may apply a jamming signal power scheme to the jamming signal by either using the determined transmit power or adjusting the determined transmit power in accordance with the jamming signal power scheme.