IAB Node Power Control for MT-DU Interference
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Solution Overview
Problem
In wireless communication nodes using Integrated Access and Backhaul (IAB), simultaneous operation of Mobile Termination (MT) and Distributed Unit (DU) leads to differences in received radio signal power, causing interference and reduced reception quality, especially when sharing the same time resource.
Innovation Solution
A wireless communication node with a control unit that sets a downlink target value for received power based on uplink power from a lower node and transmits power control information to adjust transmission power accordingly, ensuring balanced power levels between MT and DU even when operating simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the MT and DU operate simultaneously using the same time resource, then the communication efficiency and resource utilization are improved, but the received power difference between MT and DU increases causing interference and reception failures
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the downlink transmission power based on the received power difference between MT and DU. The controlling unit calculates the power difference and modifies the downlink transmission power parameter to compensate for the imbalance, ensuring both MT and DU can reliably receive signals simultaneously.
Solution Approach 2:
The patent implements feedback mechanisms where the receiving unit measures the received power of uplink signals from lower nodes, and this measurement feedback is used by the controlling unit to adjust the downlink transmission power. This closed-loop feedback ensures continuous optimization of power levels for simultaneous MT and DU operation.
2Measurement precision
If the receiver is adjusted to a radio signal with high received power, then the high power signal is received properly, but low power signals fall out of the receivable range
Solution Approach 1:
The patent applies dynamics by making the receiver sensitivity adjustable rather than fixed. The receiving unit can dynamically change its sensitivity level based on the detected received power of uplink signals, allowing it to adapt between receiving high power signals and low power signals as needed, thus maintaining reliable reception across varying power conditions.
3Area of stationary object
If a radio signal with high received power is transmitted, then the transmission coverage is improved, but it interferes with radio signals with low received power
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the downlink transmission power parameter based on the received power conditions. Instead of using fixed high power transmission, the system modifies the power parameter in real-time to achieve adequate coverage while minimizing interference to low power signals from lower nodes.
Solution Approach 2:
The patent implements feedback by using the measured received power of uplink signals to control the downlink transmission power. This feedback mechanism ensures that transmission power is optimized to provide sufficient coverage while automatically reducing power when low power signals are detected, thereby minimizing harmful interference.
Data Source
AI summary
A wireless communication node sets a downlink target value of a received power of a downlink from an upper node based on a received power of an uplink from a lower node, and transmits, to the upper node, power control information based on the downlink target value.