Temporary Transmit Power Adjustment for Full Duplex Self-Interference
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Solution Overview
Problem
In wireless communications, devices operating in full duplex mode face self-interference issues due to concurrent transmission and reception, which existing power control techniques struggle to mitigate efficiently, leading to unnecessary power adjustments and increased signaling overhead.
Innovation Solution
The implementation of a closed loop transmit power control method that allows for temporary uplink transmit power adjustments during specific slots, indicated by a 'one-time' application indication in downlink control information, enabling increased power for full duplex slots while reverting to baseline power for other slots, thereby reducing overhead and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing power control techniques are used to mitigate self-interference in full duplex mode, then interference reduction is achieved, but unnecessary power adjustments and increased signaling overhead occur
Solution Approach 1:
The patent applies different power control strategies to different transmission scenarios: accumulation mode for half-duplex slots and one-time mode for full duplex slots. This localized approach ensures that power adjustments are made only where necessary (full duplex slots with self-interference), avoiding unnecessary adjustments in half-duplex slots, thereby reducing signaling overhead while effectively mitigating self-interference where it occurs
Solution Approach 2:
The patent segments the power control procedure into two distinct modes: accumulation mode for regular half-duplex transmissions and one-time mode for full duplex transmissions. By dividing the power control mechanism into these separate modes with different behaviors, the system can apply targeted power adjustments only during full duplex slots, reducing overall signaling overhead while maintaining effective interference mitigation
2Productivity
If temporary power adjustments are made for full duplex slots, then network efficiency is enhanced, but device complexity increases
Solution Approach 1:
The patent introduces dynamic power control modes that can switch between accumulation and one-time adjustments based on duplex mode. The UE and network entity dynamically select the appropriate power control mode for each slot type, enabling efficient adaptation to varying transmission conditions while maintaining manageable complexity through standardized procedures for each mode
3Measurement precision
If power adjustments are accumulated over multiple commands, then power control precision is improved, but response time to temporary interference increases
Solution Approach 1:
The patent employs periodic accumulation of power adjustments across multiple TPC commands for half-duplex slots, achieving precise power control through gradual adjustments. For full duplex slots requiring immediate interference mitigation, the one-time mode provides instantaneous response by applying the full power adjustment in a single command, thus balancing precision and response time for different scenarios
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide for temporary transmit power control adjustments for one or more transmissions, such as transmissions when a device that is to receive the transmissions is operating in a full duplex mode. A network entity may operate in a full duplex mode for a first slot, and may provide a user equipment (UE) with a transmit power control command to make an adjustment in uplink transmit power for uplink transmissions in the first slot. The UE may transmit according to a first uplink transmit power prior to the first slot, transmit at an adjusted second transmit power during the first slot, and then transmit according to the first uplink transmit power for uplink transmissions subsequent to the first slot.