IAB Node Bearer Remapping for Wireless Coverage
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Solution Overview
Problem
Integrated Access and Backhaul (IAB) networks face challenges in efficiently managing flow control and rerouting in wireless communication systems, particularly in high-frequency bands where coverage is limited and dense deployments are required, necessitating improved bearer remapping and rerouting mechanisms to enhance reliability and capacity.
Innovation Solution
The implementation of methods in IAB nodes that involve receiving flow control feedback to perform bearer remapping and rerouting, including selecting available egress backhaul radio link control channels based on buffer size thresholds and adapting backhaul adaptation protocol data packets, as well as triggering rerouting upon buffer status reporting failures or radio link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multi-hop backhauling is used to extend coverage in high-frequency radio communication systems, then coverage extension is improved, but network complexity and signal reliability deteriorate
Solution Approach 1:
The patent implements dynamic bearer remapping that allows IAB nodes to adaptively switch between different backhaul RLC channels based on real-time flow control feedback. This dynamic adjustment enables the system to maintain reliable signal transmission across extended multi-hop coverage areas by selecting optimal transmission paths when congestion or failures occur
Solution Approach 2:
The patent employs flow control feedback mechanisms where IAB nodes receive buffer status information from upstream nodes and use this feedback to make informed bearer remapping decisions. This feedback loop ensures that coverage extension through multi-hop backhauling does not compromise signal reliability, as the system continuously adapts to network conditions
2Adaptability or versatility
If bearer remapping is performed based on flow control feedback, then network adaptability is improved, but processing complexity increases
Solution Approach 1:
The patent establishes pre-configured bearer mappings and routing tables before data transmission begins. When flow control feedback indicates congestion or failure, the IAB node can perform bearer remapping by selecting from pre-established alternative paths rather than computing new routes in real-time. This preliminary preparation reduces processing complexity while maintaining high network adaptability
Solution Approach 2:
The patent changes the state of bearers from static to dynamic by introducing flow control feedback-based remapping. The system monitors buffer status parameters and adjusts bearer assignments accordingly, allowing the network to adapt to changing conditions without requiring complex real-time optimization algorithms at each node
3Reliability
If rerouting is triggered on buffer status reporting failure, then transmission reliability is improved, but latency increases
Solution Approach 1:
The patent pre-configures alternative backhaul RLC channels and routing paths so that when buffer status reporting failure occurs, the IAB node can immediately switch to a pre-selected alternative bearer. This eliminates the need for time-consuming route discovery and reconfiguration, thereby maintaining transmission reliability while minimizing additional latency
Data Source
AI summary
Embodiments of the present disclosure relate to wireless communication in an IAB network. According to some embodiments of the disclosure, a method performed by an IAB node may include: receiving flow control feedback; and performing bearer remapping based on the received flow control feedback.