IAB Adaptation Layer Packet Routing for Simpler Backhaul
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Solution Overview
Problem
The definition and function of the adaptation layer in an integrated access and backhaul node for 5G mobile communication systems remain unclear, leading to complexity in end-to-end user plane processes and implementation.
Innovation Solution
A processing method for the adaptation layer that includes functions such as mapping, routing, and recovering data packets, along with the use of serial numbers to manage data transmission between nodes, reducing complexity and ensuring efficient end-to-end user plane processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the adaptation layer functions are not clearly defined, then the system maintains flexibility for future developments, but the end-to-end user plane process complexity increases and implementation becomes difficult
Solution Approach 1:
The patent segments the user plane protocol stack into distinct functional layers (PDCP, RLC, MAC, PHY) with clearly defined adaptation layer functions. The adaptation layer is specifically responsible for F1 backhaul data transmission between IAB nodes, separating its responsibilities from other layers and reducing overall system complexity through functional decomposition.
Solution Approach 2:
The adaptation layer acts as an intermediary component between the PDCP layer and the F1 interface in IAB nodes. It mediates the transmission of backhaul data by receiving data from upper layers and forwarding it through the wireless backhaul interface, providing a clear interface definition that simplifies implementation while maintaining system flexibility.
2Reliability
If a complete protocol stack is implemented in each base station node, then each node can operate independently, but the network deployment flexibility and backhaul connection requirements increase
Solution Approach 1:
The patent implements a universal IAB node design where nodes can function both as relay nodes and as donor nodes depending on network configuration. The adaptation layer provides multi-functional support for different backhaul scenarios (L2 relay and L3 relay architectures), allowing nodes to adapt to various deployment requirements without requiring complete protocol stacks in each node.
Solution Approach 2:
The patent employs a nested architecture where IAB nodes are nested within the overall 5G network structure with hierarchical backhaul connections. The adaptation layer enables nested routing where data can be forwarded through multiple IAB nodes in a chain, allowing flexible network topology deployment while maintaining reliable end-to-end connections through defined adaptation functions at each node.
Data Source
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AI summary
A processing method of an adaptation layer of an integrated access and backhaul node and an adaptation layer are provided. The method includes: mapping, by the adaptation layer of the integrated access and backhaul node, a received first data packet to a first bearer or channel between the integrated access and backhaul node and a first node; transmitting, by the adaptation layer of the integrated access and backhaul node, the first data packet to the first node; wherein the first node is a downstream integrated access and backhaul node relative to the integrated access and backhaul node and/or a UE accessing the integrated access and backhaul node, or the first node is an upstream integrated access and backhaul node relative to the integrated access and backhaul node or a donor node of the integrated access and backhaul node.