IAB Packet Rerouting for Congestion and Loop Avoidance
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Solution Overview
Problem
The challenge of routing and rerouting backhaul traffic within multi-hop IAB networks is complicated by congestion and radio link failures, leading to potential routing loops and failure to meet packet delay budgets.
Innovation Solution
The implementation of packet rerouting methods involving donor central units configuring IAB nodes with rerouting configuration information, including routing selection tables and trigger mechanisms to balance network load and avoid repeated rerouting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet rerouting is implemented to respond to congestion and radio link failures, then network reliability is improved, but routing loops and packet delay budget violations may occur
Solution Approach 1:
The patent implements preliminary actions by pre-configuring alternative routing paths and preparing rerouting decision logic before failures occur. The system maintains multiple candidate paths and pre-establishes rerouting criteria, enabling rapid response to congestion or link failures without delay while preventing routing loops through pre-defined path selection rules.
Solution Approach 2:
The patent employs feedback mechanisms where IAB nodes monitor network conditions (congestion levels, link status) and provide feedback to trigger appropriate rerouting actions. This closed-loop approach ensures reliable detection of failures while controlling packet delay through timely and targeted rerouting decisions based on real-time network state information.
2Adaptability or versatility
If dynamic rerouting decisions are made at IAB nodes, then network adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the rerouting decision-making process into modular components: path selection logic, failure detection modules, and rerouting execution functions. This modular architecture enables dynamic adaptability while managing complexity through structured, separable decision-making units that can be independently configured and managed.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting routing parameters (selected path, next hop node, transmission parameters) based on network conditions. This approach provides high adaptability to congestion and failures while controlling complexity through systematic parameter modification rather than complex reconfiguration, maintaining operational simplicity.
3Reliability
If multiple routing paths are maintained for redundancy, then network reliability is improved, but routing control complexity increases
Solution Approach 1:
The patent implements dynamics by maintaining multiple routing paths in a dynamic, manageable manner where paths can be activated or deactivated based on network conditions. The system dynamically selects and switches between paths without requiring complex static configuration of all possible routes, reducing routing control complexity while preserving reliability through redundant path options.
Data Source
AI summary
This disclosure relates to methods and apparatus for packet rerouting. In one embodiment, a method of packet rerouting includes receiving, by a wireless node from a donor central unit (CU), packet rerouting configuration information, and rerouting, by the wireless node, a transmission of a packet from a first transmission path to a second transmission path in response to, at least in part, the packet rerouting configuration information.