IAB Node Power Adjustment for DU-MT PSD Balance
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Solution Overview
Problem
In Integrated Access Backhaul (IAB) systems, the imbalance of Power Spectrum Densities (PSDs) between the Distributed Unit (DU) and Mobile Termination (MT) functions, as well as signal interference between them, affect demodulation performance and reception, which existing power control methods fail to adequately address.
Innovation Solution
A power adjustment method where an IAB node device reports a power adjustment parameter to its parent node device, allowing the parent node to adjust its downlink transmit power to balance the received powers of the DU and MT, thereby alleviating PSD imbalance and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the DU and MT share a set of RF/panel, then the received power of DU and MT can be balanced, but signal interference occurs between DU transmission and MT reception
Solution Approach 1:
The IAB node device is segmented into separate DU and MT functional parts with independent power control. The patent applies different power adjustment mechanisms to DU and MT, allowing them to operate simultaneously without mutual interference despite sharing RF/panel resources. This segmentation enables independent optimization of each function's power level.
Solution Approach 2:
The patent implements dynamic power adjustment where the DU transmit power is dynamically controlled based on MT receive power requirements. The network device adjusts DU power in real-time to maintain received power balance while preventing interference, making the power allocation adaptive rather than static.
2Power
If the DU transmit power is increased to improve downlink coverage, then the received power at MT deteriorates due to interference
Solution Approach 1:
The patent establishes a feedback mechanism where the IAB node device reports power measurement information to the network device. Based on this feedback, the network device adjusts the DU transmit power to maintain received power balance at the MT, creating a closed-loop control system that prevents interference while ensuring coverage.
Solution Approach 2:
The patent changes the power parameter of DU dynamically based on system conditions and feedback. By adjusting the DU transmit power parameter in response to MT receive power requirements, the system maintains optimal performance without fixed power allocation.
3Ease of operation
If existing power control methods are used, then power adjustment is simple, but PSD imbalance between DU and MT cannot be resolved
Solution Approach 1:
The patent applies preliminary power adjustment where the network device pre-configures power parameters for DU based on anticipated MT requirements. This preliminary action prevents PSD imbalance before it occurs, maintaining simple operation while achieving precise power balance through advance planning.
Data Source
AI summary
A power adjustment method and a node device are provided. The method, performed by a first Integrated Access Backhaul (IAB) node device, includes: reporting a power adjustment parameter to a target device. The power adjustment parameter is used for indicating a target power value. The power adjustment parameter is used for adjusting a transmit power of a second IAB node device. The target power value includes at least one of the following: a first power value or a second power value. The first power value is a received power value expected by a first IAB node device. The second power value is a transmit power value or a transmit power adjustment value of the second IAB node device suggested by the first IAB node device. The target device includes the second IAB node device or an IAB control node device.