Multipath IAB Multi-Hop Transmission for 5G Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in ensuring reliable data transmission due to multipath interference and latency issues, especially in industrial IoT applications where direct communication paths may be unreliable.
Innovation Solution
Implementing a multipath multi-hop transmission configuration using an integrated access and backhaul (IAB) network with Programmable Logic Controller (PLC) nodes and a donor base station, which allows for data retransmission on alternative paths and dynamic resource allocation based on buffer state reports to enhance reliability and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If direct path transmission is used between nodes, then transmission speed is improved, but transmission reliability deteriorates due to multipath interference and path failures
Solution Approach 1:
The transmission path is segmented into multiple independent routes (direct path and multi-hop paths through IAB nodes). Data packets can be transmitted through different segments of the network, allowing the system to switch from a single direct path to multiple alternative paths when the direct path fails, thereby maintaining transmission reliability while preserving speed advantages.
Solution Approach 2:
The system transitions from a one-dimensional direct path to a multi-dimensional transmission architecture by introducing intermediate IAB nodes that create additional routing dimensions. This allows data to flow through multiple hops via different nodes, adding spatial and topological dimensions to the transmission paths, which resolves the contradiction between speed and reliability.
2Reliability
If multipath multi-hop transmission is implemented, then transmission reliability is improved, but transmission latency increases
Solution Approach 1:
The system dynamically selects transmission paths based on real-time network conditions, buffer state reports, and path availability. Rather than statically using multi-hop paths, the system adapts path selection to minimize latency while ensuring reliability, switching between direct and multi-hop paths as conditions change.
Solution Approach 2:
IAB nodes serve as intermediaries that can buffer and forward data packets efficiently. These intermediary nodes enable reliable multi-hop transmission while minimizing latency through intelligent scheduling and resource allocation, acting as mediators between the source and destination to balance reliability and speed requirements.
3Productivity
If dynamic resource allocation based on buffer state reports is used, then resource utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The system implements feedback mechanisms where nodes report buffer states to the base station, which then dynamically allocates resources accordingly. This feedback loop enables efficient resource utilization by matching resource allocation to actual network conditions, while the automated nature of the feedback mechanism manages complexity through standardized reporting and scheduling procedures.
Data Source
AI summary
A base station may configure a first node and at least one second node with an integrated access and backhaul (IAB) network with the multipath multi-hop transmission configuration. The first node and the at least one second node may communicate with the first node through a direct path and a multi-hop transmission including the base station. The first node and the at least one second node may detect transmission failure on the direct path and retransmit the data packet to the multi-hop transmission, on a set of physical resource blocks (PRBs) configured by the base station. The first node may transmit remote buffer state report (rBSR) to the base station, and the base station may configure the set of PRBs for retransmissions based on the rBSR.