IAB Local Routing to Reduce Multi-Hop Backhaul Latency
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Solution Overview
Problem
In wireless backhaul networks, the multi-hop data transmission mode makes it difficult to meet low-latency service thresholds for terminal devices due to data bypassing and increased communication latency.
Innovation Solution
The implementation of local routing between IAB nodes by an IAB donor node, which determines a local routing node based on received messages to establish a direct route between nodes, reducing data bypassing and latency by using a common upper-layer node as the local routing node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-hop data transmission mode is used in wireless backhaul network, then network coverage and connectivity are improved, but communication latency increases and data bypassing occurs
Solution Approach 1:
The patent segments the backhaul transmission path by introducing local routing between IAB nodes. Instead of a single multi-hop path, data transmission is divided into local routed segments (bypassing the donor node) and non-local segments (passing through donor node). This segmentation allows data to take optimized paths, reducing latency while maintaining network coverage.
Solution Approach 2:
The patent introduces a local routing mechanism as an intermediary between IAB nodes and the donor node. The donor node acts as a mediator that receives routing information from the core network and distributes it to appropriate IAB nodes, enabling local data forwarding without requiring all data to pass through the donor node, thus reducing latency.
2Adaptability or versatility
If data is transmitted through upper-layer nodes in multi-hop mode, then network routing flexibility is maintained, but data bypassing increases and transmission bandwidth is wasted
Solution Approach 1:
The patent applies local quality by enabling IAB nodes to have different routing capabilities. Some IAB nodes are configured with local routing information to forward data locally, while others continue to use traditional uplink/downlink routing. This localized optimization reduces unnecessary data bypassing and bandwidth waste in specific network segments while maintaining overall routing flexibility.
Solution Approach 2:
The patent implements preliminary action by pre-configuring routing information in IAB nodes based on routing information received from the core network via the donor node. This advance configuration enables IAB nodes to make local routing decisions without real-time intervention, reducing data bypassing and optimizing bandwidth utilization before data transmission occurs.
3Device complexity
If traditional multi-hop routing is used, then network simplicity is maintained, but transmission error probability increases
Solution Approach 1:
The patent segments the transmission path into multiple independent hops with local routing capabilities. By breaking down the long multi-hop path into shorter local segments, each with its own routing decision, the system reduces the cumulative error probability while maintaining manageable complexity at each node.
Data Source
AI summary
A communication method includes an integrated access and backhaul IAB donor node that receives a first message from a core network network element, where the first message indicates to establish a local route between a first node and a second node, and the first node is an IAB node; and the IAB donor node determines a local routing node based on the first message, where a data packet between the first node and the second node is locally forwarded by using the local routing node. This method reduces data bypassing and reduce a communication latency.