IAB Radio Node Downlink Power Control for MT-DU Interference
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Solution Overview
Problem
The simultaneous operation of Mobile Termination (MT) and Distributed Unit (DU) in Integrated Access and Backhaul (IAB) results in power imbalances, leading to poor reception of radio signals with low received power due to interference from signals with high received power, and shared receivers failing to receive low-power signals effectively.
Innovation Solution
A radio communication node equipped with a transmitting/receiving unit and a control unit that reports power control information to the upper node for downlink transmission power control, enabling equalization of received power levels and preventing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MT and DU operate simultaneously using the same time resource, then the productivity of the radio communication node is improved, but the received power balance deteriorates causing interference
Solution Approach 1:
The patent changes the transmission power parameter dynamically based on the operating mode. When simultaneous operation is detected, the system adjusts the transmission power of one of the signals (typically DU) to a lower level to prevent it from interfering with the reception of the other signal (MT) at the shared receiver. This parameter adjustment resolves the power balance issue while maintaining simultaneous operation capability.
2Reliability
If transmission power is increased to ensure reliable reception, then the reliability of signal reception is improved, but interference to other signals increases
Solution Approach 1:
The patent applies different transmission power levels to different functional units (MT and DU) based on their specific reception requirements. Instead of using a uniform high power level for all transmissions, the system assigns appropriate power levels locally to each unit, ensuring that each signal is transmitted with just enough power for reliable reception without unnecessarily interfering with other signals.
Solution Approach 2:
The transmission power is made dynamic rather than static. The system continuously monitors the operating mode and adjusts transmission power levels in real-time. When switching between half-duplex and full-duplex modes, or when detecting simultaneous operation, the power levels are dynamically recalibrated to maintain optimal reception reliability while minimizing interference.
3Device complexity
If a shared receiver is used between MT and DU, then the device complexity is reduced, but the ability to receive low-power signals deteriorates due to high-power signal interference
Solution Approach 1:
The patent implements periodic time-division multiplexing where the shared receiver alternates between serving MT and DU functions. During periods when MT is transmitting, the receiver is dedicated to receiving DU signals, and vice versa. This periodic allocation ensures that the receiver captures low-power signals without interference from simultaneously transmitted high-power signals, while still maintaining a single shared receiver architecture.
Data Source
AI summary
A radio communication node is disclosed including a transmitting/receiving unit that transmits/receives a radio signal to/from an upper node forming an integrated access backhaul; and a control unit that reports, to the upper node, power control information used for transmission power control of a downlink in the upper node.