Relay Node Rerouting Delay for IAB Congestion Control
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Solution Overview
Problem
Existing cellular communication systems face challenges in efficiently managing data packet transfer and congestion control in the presence of backhaul link failures and congestion, particularly in systems utilizing Integrated Access and Backhaul (IAB) nodes, where immediate rerouting can exacerbate congestion and lead to inefficiencies.
Innovation Solution
Implementing a communication control method that involves a relay node receiving flow control feedback messages and executing local rerouting to alternative paths only after a certain period has elapsed or upon failure to transfer data packets for a certain period, allowing the system to assess congestion conditions before rerouting, thereby optimizing data transfer paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay nodes use fixed routing paths for data packet transfer, then network结构简单性 is maintained, but network reliability deteriorates due to backhaul link failures and congestion
Solution Approach 1:
The patent implements dynamic routing where relay nodes automatically switch from primary to alternative paths based on real-time link status. The system transitions from static routing to adaptive routing that responds to congestion and failure conditions, maintaining reliability without requiring complex manual configuration.
Solution Approach 2:
The patent employs feedback mechanisms where relay nodes monitor link status and automatically trigger rerouting when failures or congestion are detected. This closed-loop control enables the network to self-heal and adapt to changing conditions without increasing operational complexity.
2Reliability
If relay nodes implement local rerouting to alternative paths, then data packet transfer reliability improves during failures, but network congestion may worsen due to suboptimal path selection
Solution Approach 1:
The patent pre-configures alternative routing paths during network setup, so that when failures occur, relay nodes can immediately switch to predetermined backup paths without complex real-time calculations. This reduces latency and prevents congestion from suboptimal path selection.
Solution Approach 2:
The system dynamically adjusts routing parameters such as path selection and transmission rates based on network conditions. When congestion is detected on alternative paths, the system modifies routing parameters to distribute traffic more evenly, preventing congestion propagation.
3Reliability
If relay nodes wait for certain period before executing rerouting, then false positives from transient failures are avoided, but service interruption time increases
Solution Approach 1:
The patent implements a timeout mechanism where relay nodes wait for a predetermined period before executing rerouting. This partial action approach filters out transient failures while minimizing service interruption by using optimized timeout values that balance accuracy and speed.
Solution Approach 2:
The system uses periodic status checking during the wait period, allowing relay nodes to monitor link recovery attempts. If the primary path recovers within the timeout period, rerouting is cancelled; otherwise, the predetermined alternative path is activated, optimizing both accuracy and response time.
Data Source
AI summary
In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes receiving, by a relay node involved between a parent node and a child node, a flow control feedback message from the parent node or the child node. The communication control method includes executing, by the relay node, local rerouting to transfer a data packet to an alternative path, which is different from a path to the parent node or the child node transmitting the flow control feedback message, in response to a certain period elapsing after receiving the flow control feedback message.