Sidelink Duplex Mode Switching for Self-Interference Control
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Solution Overview
Problem
In wireless communications systems, UEs operating in full-duplex mode experience self-interference, leading to reduced throughput due to high interference levels, which existing technologies fail to efficiently mitigate.
Innovation Solution
UEs measure interference levels and switch to a half-duplex mode when interference exceeds a threshold, using techniques such as transmitting CSI-RSs for measurements and decoding data packets to determine interference, and sending indications to upper layers for mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs operate in full-duplex mode for sidelink communications, then communication efficiency and throughput are improved, but self-interference between transmissions and receptions increases
Solution Approach 1:
The UE dynamically switches between full-duplex and half-duplex modes based on real-time interference measurements. When interference exceeds a threshold, the UE transitions from full-duplex to half-duplex mode, making the system adaptable to changing channel conditions rather than being fixed in one mode
Solution Approach 2:
The system implements a feedback mechanism where the UE measures interference levels on allocated resources, compares measurements to thresholds, and uses this feedback to determine mode switching. This closed-loop control enables the system to respond to interference conditions and optimize performance
2Object-affected harmful factors
If UEs switch to half-duplex mode to reduce self-interference, then interference levels are reduced, but communication efficiency and throughput decrease
Solution Approach 1:
The system dynamically adjusts the duplex mode based on measured interference conditions. Rather than permanently operating in half-duplex mode to avoid interference, the UE switches modes adaptively - using full-duplex when interference is low (maintaining high throughput) and half-duplex when interference is high (reducing self-interference)
3Reliability
If UEs continuously monitor interference levels to optimize mode switching, then communication quality is maintained, but measurement and processing overhead increases
Solution Approach 1:
The system performs interference measurements on specifically allocated resources (CSI-IM resources) rather than continuously monitoring all transmissions. This partial measurement approach provides sufficient information for mode switching decisions without the overhead of comprehensive continuous monitoring
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques at a user equipment (UE) provide for efficiently falling back to a half-duplex mode from a full-duplex mode when a level of interference is high. In particular, the UE may measure the level of interference at the UE (e.g., caused at least partially by self-interference between transmissions and receptions at the UE), and the UE may fall back to a half-duplex mode if the level of interference is above a threshold. In one example, the UE may transmit channel state information (CSI) reference signals (CSI-RSs) on resources allocated for interference measurements, and the UE may perform measurements on the CSI-RSs to identify a level of interference. In another example, the UE may transmit a data packet on resources allocated for interference measurements, and the UE may decode the data packet to identify a level of interference.