Downlink Power Adaptation for Full-Duplex Self-Interference
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Solution Overview
Problem
Full-duplex wireless communications systems face reliability and efficiency issues due to self-interference, which existing techniques struggle to mitigate effectively, especially in user equipment (UE) with power constraints and limited processing capabilities.
Innovation Solution
Adjusting downlink transmission power based on communication parameters and overlap with uplink messages to reduce self-interference, allowing simultaneous downlink and uplink operations with improved reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink transmission power is increased to improve full-duplex communication reliability, then self-interference is reduced, but power consumption increases
Solution Approach 1:
The patent implements dynamic downlink transmission power adjustment based on real-time detection of uplink-downlink message overlap. The base station monitors scheduling information and dynamically modifies downlink power levels only during overlap periods, transitioning from static to adaptive power control to reduce unnecessary power consumption while maintaining communication reliability.
Solution Approach 2:
The system changes the transmission power parameter conditionally based on the presence of message overlap. When overlap is detected between uplink and downlink messages, the downlink transmission power is adjusted; otherwise, normal power levels are maintained. This selective parameter modification optimizes the balance between reliability and power consumption.
2Productivity
If downlink transmission power is adjusted dynamically to reduce self-interference, then full-duplex efficiency is improved, but device complexity increases
Solution Approach 1:
The base station implements a feedback mechanism by monitoring scheduling information to detect uplink-downlink message overlap and using this information to adjust downlink transmission power. This closed-loop approach enables efficient full-duplex operation by continuously adapting to channel conditions and interference levels without requiring complex processing at the UE side.
Solution Approach 2:
The base station acts as an intermediary that centralizes the complexity of power adjustment logic. Instead of distributing complex processing requirements to multiple UEs, the base station alone performs the overlap detection and power control, simplifying the overall system architecture while maintaining full-duplex efficiency.
3Reliability
If downlink power adjustment is implemented to mitigate self-interference, then communication reliability is improved, but processing overhead increases
Solution Approach 1:
The base station performs preliminary detection of uplink-downlink message overlap using scheduling information before transmitting downlink messages. By identifying overlap conditions in advance, the system can pre-adjust power levels, avoiding the need for complex real-time processing during active communication and reducing overall processing overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) supporting full duplex communications may determine that a set of downlink messages to be transmitted from a base station to the UE overlaps in time with a set of uplink messages to be transmitted from the UE. Accordingly, the UE may determine a downlink transmission power adjustment value for the set of downlink messages. In some examples, the base station may indicate the downlink transmission power adjustment value to the UE via radio resource control (RRC) signaling, a downlink control information (DCI) message, or both. The UE may transmit the set of uplink messages while simultaneously receiving the set of downlink messages with a transmission power that corresponds to the downlink transmission power adjustment value. Adjusting the transmission power for the set of downlink messages may reduce self-interference at the UE, the base station, or both.