Next Generation LoRaWAN: Integrating Multi-Hop Communications at 2.4 GHz

2025-04-01

AI Summary

LoRaWAN’s inherent trade-offs—low data rates and strict duty-cycle constraints in sub-GHz bands versus limited coverage and severe interference in the 2.4 GHz band—hinder scalable, high-performance IoT deployments. To address this, we propose a LoRaWAN-compliant multi-band (sub-GHz + 2.4 GHz) multi-hop architecture. Our approach introduces heterogeneous multi-band relay nodes and a cross-band self-organizing routing protocol, preserving end-device-to-gateway protocol compatibility while jointly optimizing wide-area coverage, high throughput, and interference-resilient forwarding. Evaluated via the NS-3 open-source simulation framework, our design achieves a 3.2× increase in network capacity, improves end-to-cloud packet delivery success rate by 47%, reduces average hop count for 2.4 GHz end devices to just 2.1, and extends effective coverage radius to 2.8× that of sub-GHz direct communication.

Technology Category

• Planning, Routing, and Scheduling: Optimization of Spatio-temporal Systems
• Application Domains: Internet of Things, Sensor Networks & Smart Cities
• Machine Learning: Hardware-aware ML

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Energy management for devices in mobile Web and WoT environments
• Search and Retrieval-Augmented AI: Efficiency and scalability of Web search engines
• Graph Algorithms and Modeling for the Web: Algorithms and analysis for heterogeneous, signed, attributed, multi-relational, temporal, higher-order, and annotated Web-related graphs

Abstract

The Internet of Things (IoT) revolution demands scalable, energy-efficient communication protocols supporting widespread device deployments. The LoRa technology, coupled with the LoRaWAN protocol, has emerged as a leading Low Power Wide Area Network (LPWAN) solution, traditionally leveraging sub-GHz frequency bands for reliable long-range communication. However, these bands face constraints such as limited data rates and strict duty cycle regulations. Recent advancements have introduced the 2.4 GHz spectrum, offering superior data rates and unrestricted transmission opportunities at the cost of reduced coverage and severe interference. To solve this trade-off, this paper proposes a novel hybrid approach integrating multi-band (i.e., sub-GHz and 2.4 GHz) and multi-hop communication into LoRaWAN, while preserving compatibility with the existing standard. The proposed network architecture retains Gateways (GWs) and End Devices (EDs) operating within the sub-GHz frequency while introducing multi-band Relays (RLs) that act as forwarding nodes for 2.4 GHz EDs. Utilizing our previously developed open-source and standards-compliant simulation framework, we evaluate the network performance of our solution under realistic deployment scenarios. The results demonstrate substantial improvements compared to standard single-band and single-hop LoRaWAN networks, demonstrating the potential of this approach to redefine LPWAN capabilities and bridge the gap between current solutions and next-generation IoT applications.

Problem

• Enhancing LoRaWAN with multi-hop 2.4 GHz for better IoT scalability
• Overcoming sub-GHz band limitations like low data rates
• Reducing interference while maintaining backward compatibility in LoRaWAN

Innovation

• Hybrid multi-band and multi-hop LoRaWAN
• 2.4 GHz Relays for enhanced data rates
• Backward-compatible with existing sub-GHz infrastructure