IAB Node Power Control for Wireless Backhaul in 5G mmWave
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Solution Overview
Problem
In 5G communication systems, the attenuation of propagation paths in mmWave bands limits coverage, leading to high costs for optical cable installations between relays, and the IAB node's unidirectional transmission/reception characteristics cause transmission/reception delays and self-interference issues during bidirectional operations.
Innovation Solution
Implementing frequency domain multiplexing (FDM) or spatial domain multiplexing (SDM) for backhaul and access data, and using broadband radio frequency resources to transmit backhaul data wirelessly instead of optical cables, along with power control schemes to manage power differences and reduce self-interference during bidirectional transmission/reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If optical cables are installed between relays to extend coverage in mmWave bands, then coverage is improved, but installation cost increases
Solution Approach 1:
The patent replaces the mechanical installation of optical cables with a wireless backhaul system using IAB nodes. Instead of physically connecting relays through optical cables, the system uses wireless communication in mmWave bands to transmit backhaul data between IAB nodes, thereby eliminating the need for costly optical cable installations while maintaining coverage extension capability
Solution Approach 2:
The patent introduces IAB nodes as intermediary devices that perform dual functions: they provide access to terminals while simultaneously establishing wireless backhaul connections to parent IAB nodes or base stations. These intermediary nodes enable coverage extension without direct optical cable connections between all relays, reducing installation complexity and cost
2Productivity
If IAB node performs bidirectional transmission and reception simultaneously, then data transmission efficiency is improved, but self-interference increases
Solution Approach 1:
The patent segments the IAB node into functionally independent MT (Mobile Terminal) and DU (Distributed Unit) parts. The MT part handles reception from parent nodes while the DU part handles transmission to child nodes or terminals. This segmentation allows simultaneous bidirectional operations with reduced self-interference by separating the transmission and reception functions into distinct operational units that can be managed independently
Solution Approach 2:
The patent introduces power control mechanisms as intermediary control systems that manage the power levels of transmission and reception operations. By dynamically adjusting transmission power based on reception conditions, the power control mediator reduces self-interference while maintaining efficient bidirectional data transmission
3Object-generated harmful factors
If power control is implemented in IAB node, then self-interference is reduced, but power management complexity increases
Solution Approach 1:
The patent implements feedback-based power control where the IAB node continuously monitors reception quality and adjusts transmission power accordingly. The MT part provides feedback about reception conditions to the power control mechanism, which then adjusts the DU's transmission power to minimize self-interference. This closed-loop feedback system reduces self-interference while keeping power management complexity manageable through automated adjustment
Data Source
AI summary
The disclosure relates to a communication technique for convergence between an IoT technology and a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system thereof. The disclosure may be applied to intelligence services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety related services, etc.) according to a 5G communication system and an IoT related technology. In addition, the disclosure provides a method and an apparatus for controlling power of an IAB node in a wireless communication system.