IAB Node Cell Coverage Adjustment for Interference
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Solution Overview
Problem
In wireless communication systems, integrated access and backhaul (IAB) networks face challenges with interference and power management due to the proximity of access nodes, leading to reduced network performance and increased power consumption, especially in mobile IAB networks where nodes may overlap, causing radio link failures and redundant coverage areas.
Innovation Solution
A method and apparatus for an IAB node to adjust its cell coverage by determining geographic proximity to neighboring nodes, adjusting parameters such as transmission power and coverage area, and transmitting indications for adjustments, using reference signal measurements and central unit instructions to minimize interference and optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If access nodes are deployed in larger quantities in a small area to provide acceptable coverage, then coverage quality is improved, but interference between access nodes increases and network performance deteriorates
Solution Approach 1:
The patent implements dynamic cell coverage adjustment where IAB nodes continuously monitor their coverage areas and automatically adjust parameters when geographic proximity to neighboring nodes is detected. This dynamic adaptation allows the system to maintain acceptable coverage quality while preventing interference through real-time parameter modification based on actual network conditions.
Solution Approach 2:
The patent changes physical parameters of cell coverage by adjusting transmission power levels and coverage area boundaries based on detected geographic proximity to neighboring IAB nodes. When nodes are in proximity, the system modifies these parameters to reduce overlap and interference, thereby resolving the contradiction between maintaining coverage and preventing interference.
2Area of stationary object
If IAB nodes operate with full cell coverage, then network coverage is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts cell coverage parameters based on real-time detection of geographic proximity to neighboring nodes. When full coverage is not needed due to nearby nodes providing sufficient coverage, the IAB node reduces its transmission power and coverage area, thereby lowering power consumption while maintaining adequate network coverage through coordinated operation.
Solution Approach 2:
IAB nodes autonomously monitor their own coverage areas and automatically adjust their transmission parameters without requiring continuous external control. This self-service mechanism enables each node to optimize its power consumption by reducing coverage when neighboring nodes are present, while still ensuring acceptable overall network coverage through distributed intelligence.
3Adaptability or versatility
If mobile IAB nodes are deployed, then network flexibility and coverage adaptability are improved, but interference and radio link failures increase due to overlapping coverage areas
Solution Approach 1:
The patent implements a feedback mechanism where mobile IAB nodes continuously monitor reference signals from neighboring nodes and detect their geographic proximity. Based on this feedback information, the nodes automatically adjust their cell coverage parameters to prevent harmful overlap, thereby maintaining radio link stability while preserving the flexibility and adaptability benefits of mobile deployment.
Solution Approach 2:
The system takes preliminary action by detecting the presence of neighboring mobile IAB nodes before interference or radio link failures occur. By proactively adjusting coverage parameters in advance based on detected proximity, the system prevents the harmful effects of overlapping coverage areas, thereby maintaining reliability while allowing mobile nodes to provide network flexibility.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques provide for a first IAB node determining an adjustment to at least one parameter corresponding to a cell coverage of the first IAB node based at least in part on a geographic proximity of a cell relative to the first IAB node. For example, the first IAB node may determine to adjust the parameters based reference signal measurements, signal quality measurements (e.g., received from child nodes or user equipments (UEs)), etc. In another example, the first IAB node may receive an instruction from a central unit (CU) of the IAB network to adjust the at least one parameter. The first access node may transmit an indication of the adjustment to the at least one parameter. For example, the first access node may signal the adjustments to the CU, child IAB nodes, UEs and/or, other IAB nodes.