Adaptation Layer Configuration in 5G IAB Relay Nodes
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Solution Overview
Problem
Current 5G wireless communication networks face challenges in efficiently configuring and reconfiguring adaptation layers for routing packets in integrated access and backhaul (IAB) networks, particularly in multi-hop scenarios, which affects the routing of incoming packets to relay nodes or user equipment (UEs) and mapping them to appropriate bearers.
Innovation Solution
Enhancements to the F1-AP and RRC protocols are implemented to set up and reconfigure adaptation layers in IAB nodes, enabling hop-by-hop forwarding and proper bearer mapping by establishing IP connectivity and modifying signaling messages to include adaptation layer setup procedures, ensuring packets are routed correctly through relay nodes to destination UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adaptation layers are configured in IAB nodes for packet routing, then packet routing efficiency and bearer mapping are improved, but device complexity and configuration difficulty increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring adaptation layer parameters and routing rules in IAB nodes before actual packet forwarding begins. The network controller prepares and distributes configuration data (including adaptation layer IDs, routing rules, and bearer mappings) to IAB nodes in advance, so that when packets arrive, the routing and mapping operations can proceed efficiently without real-time configuration delays.
Solution Approach 2:
The patent introduces an intermediary network controller that manages the complex adaptation layer configuration process. This intermediary entity coordinates between the core network and multiple IAB nodes, automating the distribution of configuration parameters and routing rules. The intermediary simplifies the overall system by centralizing control, reducing the burden on individual IAB nodes, and enabling scalable deployment without proportionally increasing configuration complexity at each node.
2Manufacturing precision
If protocol enhancements are implemented for adaptation layer setup, then bearer mapping accuracy is improved, but ease of operation and implementation difficulty worsen
Solution Approach 1:
The patent applies segmentation by dividing the bearer mapping function into distinct components: adaptation layer processing, routing rule application, and bearer identification. Each IAB node is configured to handle specific segments of the mapping process based on its position in the network and traffic patterns. This segmentation allows for more precise mapping control while enabling modular implementation and testing of individual mapping functions.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting adaptation layer configuration parameters (such as adaptation layer IDs, routing rule priorities, and bearer mapping tables) based on network conditions, traffic types, and QoS requirements. The network controller can modify these parameters remotely to optimize bearer mapping accuracy for different service scenarios without requiring physical device changes or complex reconfiguration procedures at each IAB node.
3Productivity
If hop-by-hop forwarding is enabled in multi-hop scenarios, then network capacity and throughput are improved, but latency and configuration complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-establishing forwarding state and routing information in each IAB node before multi-hop packet forwarding commences. The network controller distributes forwarding tables, next-hop identifiers, and bearer mapping information to all IAB nodes in advance. This allows packets to be forwarded hop-by-hop with minimal processing delay at each node, as the routing decisions are based on pre-computed information rather than real-time calculations.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining active forwarding states and cached routing information in IAB nodes throughout the packet forwarding process. Once forwarding paths are established, the system keeps these states alive and ready for continuous packet flow, avoiding repeated setup procedures for each packet. This continuous state maintenance enables high-speed hop-by-hop forwarding while minimizing the latency introduced by state transitions and reconfiguration events.
Data Source
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AI summary
Configuring an adaptation layer in a relay node communicates with a central unit of a donor base station through a distributed unit of the donor base station comprises connecting (3402) to the donor base station, after establishing the connection, configuring (3404) an adaptation layer in a protocol stack for an MT part of the relay node, the adaptation layer providing for routing of incoming packets to one or more further relay nodes or to one or more user equipments, UEs, connected to the relay node and for mapping of those incoming packets to bearers, and, after configuring the adaptation layer for the MT part of the relay node, configuring (3406) an adaptation layer for the distributed unit part of the relay node for forwarding packets exchanged between the central unit of the donor base station and the first further relay node downstream of the relay node.