Relay Node BAP Header Rewriting for IAB Rerouting
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Solution Overview
Problem
In cellular communication systems, existing methods for packet forwarding control in Integrated Access and Backhaul (IAB) networks face challenges in efficiently managing routing configurations and rerouting data packets when line failures occur, leading to delays and inefficiencies in packet delivery.
Innovation Solution
The proposed communication control method involves a relay node transmitting information about its BAP header rewriting capabilities to a donor node, which configures inter-topology routing and local rerouting settings, allowing the relay node to forward data packets using alternative paths and rewritten routing IDs, thereby reducing processing delays and ensuring efficient packet forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing packet forwarding control methods are used in IAB networks, then routing configurations can be managed, but delays and inefficiencies occur in packet delivery when line failures occur
Solution Approach 1:
The patent pre-configures multiple routing IDs (primary and alternative) and establishes routing tables in advance before line failures occur. When a failure is detected, the relay node can immediately switch to the pre-configured alternative routing ID without waiting for new routing configuration, thereby reducing packet delivery delays while maintaining reliability
Solution Approach 2:
The patent implements dynamic routing where the relay node can switch between primary and alternative routing configurations based on real-time link status. The system monitors line conditions and dynamically selects the appropriate routing ID to forward packets, ensuring both reliability and minimal delay by adapting to changing network conditions
2Productivity
If alternative routing IDs are configured for rerouting, then packet forwarding efficiency improves, but routing configuration complexity increases
Solution Approach 1:
The patent segments the routing configuration into distinct primary and alternative routing IDs, each with specific purposes. The primary routing ID handles normal operations while alternative routing IDs are reserved for failure scenarios. This segmentation allows efficient packet forwarding by providing dedicated paths for different conditions while organizing the configuration complexity into manageable, purpose-specific segments
Solution Approach 2:
The patent uses parameter changes by modifying the routing ID field in packet headers to switch between different routing configurations. Instead of changing the entire routing configuration structure, the system efficiently switches parameters (routing IDs) based on link status, thereby improving forwarding efficiency while keeping the overall configuration complexity manageable through parameter-based control
Data Source
AI summary
In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes: transmitting, by a relay node to a donor node, information indicating a Backhaul Adaptation Protocol (BAP) header rewriting function is supported; performing, by the donor node, configuration related to inter-topology routing for the relay node; and forwarding, by the relay node, a data packet in accordance with the configuration related to the inter-topology routing.