Hybrid ARQ scheme using in-band full-duplex LoRa = Sistema ARQ Híbrido utilizando full-duplex dentro de banda en redes LoRa

Guirado López-Puigcerver, Juan (2018). Hybrid ARQ scheme using in-band full-duplex LoRa = Sistema ARQ Híbrido utilizando full-duplex dentro de banda en redes LoRa. Proyecto Fin de Carrera / Trabajo Fin de Grado, E.T.S.I. Telecomunicación (UPM), Lausana, Suiza.

Description

Title: Hybrid ARQ scheme using in-band full-duplex LoRa = Sistema ARQ Híbrido utilizando full-duplex dentro de banda en redes LoRa
Author/s:
  • Guirado López-Puigcerver, Juan
Contributor/s:
  • Burg, Andreas
  • Afisiadis, Orion
Item Type: Final Project
Degree: Grado en Ingeniería de Tecnologías y Servicios de Telecomunicación
Date: 2018
Subjects:
Freetext Keywords: Wireless Communications, Internet of Things (IoT), LoRaWAN,LoRaTM, in-bandfull-duplex, ARQ
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Market studies have projected that there will be around 20-30 billions of objects connected to the Internet in 2020 (McKinsey[1]). LPWAN networks offer a solution for low-power and long-range requirements. This solution is attracting a lot of users and the prospective state that there will be around 3.1 million SIGFOX, LoRa and NB-IoT devices in 2024 (Analysis Mason[2]). One of the main attractions of this technology is that they operate in unlicensed sub-GHz frequency bands. However, in the case of LoRa, the networks might get saturated if the growth projections are fulfilled, because of the constraints that ISM bands impose. This problem is worse if ARQ schemes are required. There as on for these problems is that LoRa WAN standard and ISM band constraints limit the down link traffic and make it dependant on the uplink traffic. This Project presents a new scheme that would reduce the impact of the uplink traffic on the downlink one: using in-band full duplex communications. We build an ARQ LoRa full-duplex system that proves the concept of using full-duplex with LoRa. The system is based on an end-node that sends longer frames than usual that are composed of a normal LoRa frame and redundancy bits, that are sent while listening for an Acknowledgment (ACK) that comes from the gateway. Then, as soon as the end-node detects the ACK, it stops the transmission. This Project uses PHY-layer ACK messages and a modern cannel coding scheme: polar codes. As the PHY-layer ACK message, a series of LoRa downchirps was selected, so that another LoRa channel is not occupied but the signal is still orthogonal to the LoRa data frames. The results show that we can have an ARQ system that would potentially increase the capacity of the system and reduce the time for transmission (if we consider the time for retransmissions in a normal ARQ scheme).

More information

Item ID: 53666
DC Identifier: http://oa.upm.es/53666/
OAI Identifier: oai:oa.upm.es:53666
Deposited by: Biblioteca ETSI Telecomunicación
Deposited on: 22 Jan 2019 12:54
Last Modified: 22 Jan 2019 12:54
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