# Aggressive Fragmentation Strategy for Enhanced Network Performance in Dense LPWANs

## TL;DR

This paper proposes an aggressive fragmentation strategy combined with NACKs to improve network performance and energy efficiency in dense LPWANs, addressing duty cycle and power constraints in IoT applications.

## Contribution

It introduces a novel fragmentation and NACK-based approach tailored for LoRaWAN, enhancing throughput and energy savings in congested network scenarios.

## Key findings

- Significant increase in goodput under congestion.
- Improved energy efficiency with the proposed strategy.
- Effective in meeting IoT application requirements.

## Abstract

Low Power Wide Area Networks (LPWANs) are gaining ground in the IoT landscape and, in particular, for Industrial IoT applications. However, given the strict duty cycle restrictions (e.g. 1% in SubGHz bands) and the limited power supply of devices, requirements of some applications can not always be met. This paper analyzes the potential of the combination of packet fragmentation -in the direction of the IETF LPWAN working group- and negative group acknowledgement (NACK) in LoRaWAN networks, a widespread LPWAN technology. Results show that the proposed strategy can lead to significant gains in terms of goodput and energy efficiency under congested situations.