Low-power wide area networking technology offers long-range communication, enabling new types of IoT services. LoRaWAN is one of the most adopted solutions, providing ubiquitous connectivity for outdoor applications. However, its capabilities and limitations are not well understood. The authors provide an impartial overview of LoRaWAN's limitations to avoid unrealistic expectations, discussing use cases where it works and does not work, and listing open research questions.
Mobility, traffic engineering and redundancy using RPLMaxime Denis
Master thesis presentation. Design and implementation of a solution to improve mobility between two physical WSNs using RPL. Based on the 6LBR implementation of the CETIC.
The document discusses ad hoc networks and routing protocols. It begins with an introduction to mobile ad hoc networks (MANETs), including their characteristics and applications. Several categories of routing protocols are described, including table-driven protocols like Destination Sequenced Distance Vector Routing (DSDV) and Cluster-head Gateway Switch Routing (CGSR), as well as source-initiated on-demand protocols like Dynamic Source Routing (DSR). The document provides examples and explanations of how these different protocols perform routing in MANETs.
The document discusses ad hoc networks and wireless sensor networks. It defines an ad hoc network as a temporary network composed of mobile nodes without preexisting infrastructure that is self-organizing. Wireless sensor networks are introduced as a collection of sensor nodes densely deployed to monitor conditions and cooperatively pass data back to central nodes. The document outlines key characteristics of both networks including their temporary and adaptive nature, multi-hop routing, and challenges of mobility, power constraints, and dynamic topology changes.
This document provides an overview of wireless ad-hoc networks. It discusses the definition and types of multi-hop wireless networks. Some key technical challenges for ad-hoc networks are limited wireless range, mobility, and energy constraints. The document reviews several media access and routing protocols used in ad-hoc networks, including MACA, DSDV, AODV and DSR. It also discusses providing quality of service in ad-hoc networks and some of the challenges in routing, maintenance and variable resources. In conclusion, the document states that flexibility, low cost and applications make ad-hoc networks an essential part of future pervasive computing environments.
This document discusses heterogeneous wireless network architectures that integrate cellular networks, wireless local area networks (WLANs), and mobile ad hoc networks (MANETs). It describes the key components of such an architecture, including mobile user stations, base stations, access points, and the core IP network. It also outlines 10 possible communication scenarios between two mobile stations and discusses some of the design factors and challenges in building protocols for heterogeneous networks, focusing on layers of the protocol stack from physical to network layers. Open research issues are also identified.
Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode.
The characteristics of Ad hoc networks are:
Collection of mobile nodes forming a temporary network,
Network topology changes frequently and unpredictably,
No centralized administration or standard support services and the Host is also function as router.
The document discusses wireless personal area networks (WPANs) and Bluetooth technology. It provides an overview of Bluetooth, including its history and applications. Key technical aspects of Bluetooth are covered, such as piconets, scatternets, and the different link types. The document also compares WPAN standards and technologies like Bluetooth, IEEE 802.15, and discusses their performance.
Mobility, traffic engineering and redundancy using RPLMaxime Denis
Master thesis presentation. Design and implementation of a solution to improve mobility between two physical WSNs using RPL. Based on the 6LBR implementation of the CETIC.
The document discusses ad hoc networks and routing protocols. It begins with an introduction to mobile ad hoc networks (MANETs), including their characteristics and applications. Several categories of routing protocols are described, including table-driven protocols like Destination Sequenced Distance Vector Routing (DSDV) and Cluster-head Gateway Switch Routing (CGSR), as well as source-initiated on-demand protocols like Dynamic Source Routing (DSR). The document provides examples and explanations of how these different protocols perform routing in MANETs.
The document discusses ad hoc networks and wireless sensor networks. It defines an ad hoc network as a temporary network composed of mobile nodes without preexisting infrastructure that is self-organizing. Wireless sensor networks are introduced as a collection of sensor nodes densely deployed to monitor conditions and cooperatively pass data back to central nodes. The document outlines key characteristics of both networks including their temporary and adaptive nature, multi-hop routing, and challenges of mobility, power constraints, and dynamic topology changes.
This document provides an overview of wireless ad-hoc networks. It discusses the definition and types of multi-hop wireless networks. Some key technical challenges for ad-hoc networks are limited wireless range, mobility, and energy constraints. The document reviews several media access and routing protocols used in ad-hoc networks, including MACA, DSDV, AODV and DSR. It also discusses providing quality of service in ad-hoc networks and some of the challenges in routing, maintenance and variable resources. In conclusion, the document states that flexibility, low cost and applications make ad-hoc networks an essential part of future pervasive computing environments.
This document discusses heterogeneous wireless network architectures that integrate cellular networks, wireless local area networks (WLANs), and mobile ad hoc networks (MANETs). It describes the key components of such an architecture, including mobile user stations, base stations, access points, and the core IP network. It also outlines 10 possible communication scenarios between two mobile stations and discusses some of the design factors and challenges in building protocols for heterogeneous networks, focusing on layers of the protocol stack from physical to network layers. Open research issues are also identified.
Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode.
The characteristics of Ad hoc networks are:
Collection of mobile nodes forming a temporary network,
Network topology changes frequently and unpredictably,
No centralized administration or standard support services and the Host is also function as router.
The document discusses wireless personal area networks (WPANs) and Bluetooth technology. It provides an overview of Bluetooth, including its history and applications. Key technical aspects of Bluetooth are covered, such as piconets, scatternets, and the different link types. The document also compares WPAN standards and technologies like Bluetooth, IEEE 802.15, and discusses their performance.
This document provides notes on ad hoc networks from R N S Institute of Technology. It begins with an introduction comparing cellular and ad hoc wireless networks. Ad hoc networks are infrastructureless networks that use multi-hop radio relaying. The document then discusses applications of ad hoc networks such as military operations, emergency response, wireless mesh networks, and wireless sensor networks. It also covers key issues in ad hoc networks including medium access, routing, multicasting, and energy management. The first unit focuses on these introductory concepts and applications of ad hoc networks.
The document summarizes a student project on improving energy efficiency in mobile ad hoc networks (MANETs) using random casting. The proposed approach aims to control overhearing, reduce packet loss, and improve quality of service. Simulation results show the DSR routing protocol performed better than AODV, AOMDV, and DSDV in terms of higher packet delivery ratio and lower packet loss. Future work includes analyzing the performance of the random cast architecture and applying it to more routing protocols and applications in MANET environments.
This document provides an overview of wireless sensor networks and discusses key design considerations. It describes the components of sensor nodes like the Mica mote and issues around sensing and communication ranges. Some key challenges in wireless sensor network design are energy consumption, clustering sensors, and dealing with heterogeneous and mobile sensors. The document outlines many applications of wireless sensor networks and concludes by discussing future research directions.
Definition
A decentralized type of wireless network, allowing people and devices to seamlessly internetwork in areas with no pre-existing communication infrastructure, It can turn the dream of networking at any place and at time into reality. We are almost there by the way .Ex- Bluetooth enabled mobile phones such as 3G, laptops, handheld digital devices, personal digital assistants, or wearable computers
This document discusses wireless communications and ad hoc networks. It begins with an introduction to wireless communications, including the generations of wireless technologies and electromagnetic spectrum used. It then covers wireless computer networks, focusing on wireless local area networks (WLANs) and transmission techniques like infrared and spread spectrum. The document explains the IEEE 802.11 standard architecture, including components like access points, basic service sets, and extended service sets. It discusses security issues and considerations for wireless networks. Finally, it defines ad hoc networks as decentralized peer-to-peer networks without a central access point, set up temporarily to meet immediate needs.
Ad hoc wireless networks operate without an access point in a peer-to-peer mode, while infrastructure networks use an access point. This project investigates the performance of ad hoc networks with minimal channel separation. Ad hoc networks have higher transmission speeds than infrastructure networks due to eliminating network overhead and protocols like four-way handshaking. The purpose is to establish both network types and secure them using authentication methods.
This document discusses introducing IP transport capabilities into the Cello Packet Platform (CPP) telecommunications technology. It notes that voice traffic is being replaced by data traffic, putting new demands on networks to handle both delay-sensitive and packet-oriented traffic. While ATM was considered the solution for quality of service, issues around scalability, administration and cost have emerged. The document outlines six basic principles for IP services in CPP, including embedding an IP router across the main processor cluster and device boards, and fully distributing IPv4/IPv6 forwarding in hardware or software. Introducing IP support in CPP provides benefits to network operators by offering a consistent solution for TDM, ATM and IP transport.
An ad-hoc wireless network is a collection of wireless nodes that can dynamically be set up anywhere and anytime without using an existing network infrastructure or centralized administration. There are different types including wireless mesh networks, wireless sensor networks, and hybrid wireless networks. Wireless mesh networks provide many paths for data transfer between sources and destinations with advantages like high data rates and scalability. Wireless sensor networks consist of sensor nodes that monitor regions without infrastructure by working together. Hybrid wireless networks incorporate properties of multi-hop relaying along with existing infrastructure for higher capacity and flexibility. Applications include monitoring, tracking, location services, and future scopes involve connecting more devices and enabling access to real-world information.
An ad hoc network is a type of wireless network that does not require a central router or base station. Nodes communicate directly with each other or through intermediate nodes in a multi-hop fashion without any fixed infrastructure. Routing and resource management are distributed. Common types include wireless mesh networks, wireless sensor networks, and hybrid wireless networks. Ad hoc networks face challenges related to medium access, routing, security, and resource constraints due to the lack of centralized control.
The document discusses mobile ad-hoc networks (MANETs). It provides an introduction to MANETs and their history. It describes different routing protocols for MANETs including reactive, proactive, and hybrid protocols. It discusses some problems with MANETs and applications of MANETs such as for business meetings. It proposes a solution for secure data transmission in MANETs and concludes with a comparison of MANET routing protocols.
NB-IoT: a sustainable technology for connecting billions of devicesEricsson
Under the umbrella of 3GPP, radio-access technologies for mobile broadband have evolved effectively to provide connectivity to billions of subscribers and things. Within this ecosystem, the standardization of a radio technology for massive MTC applications – narrowband IoT (NB-IoT) – is also evolving. The aim is for this technology to provide cost-effective connectivity to billions of IoT devices, supporting low power consumption, the use of low-cost devices, and provision of excellent coverage – all rolled out as software on top of existing LTE infrastructure. The design of NB-IoT mimics that of LTE, facilitating radio network evolution and efficient coexistence with MBB, reducing time to market, and reaping the benefits of standardization and economies of scale.
The IoT embeds a broad range of MTC applications, and among the different types, massive MTC – including applications like smart metering, agriculture and real estate monitoring – sets a number of performance targets for connectivity. Attempting to meet these IoT targets using a radio-access technology designed for mobile broadband, however, doesn't make economic sense. Networks that provide connectivity to massive MTC applications need a radio-access technology that can deliver widespread coverage and low power consumption, often in signal-challenged locations. Hence the need for narrowband-IoT (NB-IoT).
NB-IoT is a 3GPP radio-access technology designed to meet the connectivity requirements for massive MTC applications, as well as the design targets for IoT including low device cost, extended coverage, 40 devices per household, long battery life, and uplink latency of under 10 seconds.
NB-IoT enjoys all the benefits of licensed spectrum, the feature richness of EPC, and the overall ecosystem spread of 3GPP. At the same time, NB-IoT has been designed to meet the challenging TCO structure of the IoT market.
This articles reveals how NB-IoT is being designed and how it can be deployed in GSM spectrum, within an LTE carrier, or in an LTE or WCDMA guard band.
1. Vehicular ad hoc networks (VANETs) use vehicle-to-vehicle and vehicle-to-infrastructure communication to share safety information, improving road safety.
2. VANETs allow vehicles to form a temporary network without any preexisting infrastructure, distributing real-time information to avoid accidents.
3. Current research focuses on applications for traffic scenarios, as well as addressing challenges relating to network topology, routing mechanisms, security, and minimizing power consumption.
The document discusses ad hoc wireless networks and their applications. It describes key characteristics of ad hoc networks including being self-organizing and lacking centralized administration. It outlines several applications of ad hoc networks such as military operations, emergency response, wireless mesh networks, and wireless sensor networks. It also examines important technical issues for ad hoc networks related to medium access, routing, multicasting, transport protocols, energy management, and deployment considerations.
The document discusses routing protocols and approaches for broadcasting, multicasting, and geocasting in mobile ad hoc networks (MANETs). It describes the broadcast storm problem that can occur when simple flooding is used for broadcasting in MANETs. This results in a large number of redundant rebroadcasts. The document then summarizes various protocols proposed to optimize broadcasting in MANETs, including probability-based, area-based, neighbor knowledge-based, and connected dominating set-based approaches. It also discusses multicasting and geocasting issues and protocols for MANETs.
https://www.ijmst.com/
IJMST Volume 1 Issue 1, Manuscript 4
As the popularity of mobile devices and wireless networks significantly increased over the
past years. The wireless adhoc network has now become one of the most vibrant and active
fields of communication and networking research. These networks are a new generation of
networks offering unrestricted mobility without any underlying infrastructure. As their
principle application is in disastrous environments, security is critical. Various challenges are
faced in the adhoc environment, mostly due to the resource poorness of these networks. One
man confront in the design of these networks is their vulnerability to security attacks. The
solutions for conventional networks are usually not sufficient to provide efficient adhoc
operations. Just because of its wireless nature of communication and lack of any security
infrastructure raise several security problems and threats.
In this paper, we briefly review the threats an adhoc network faces and the security goals to
be achieved. Moreover, it also presents existing security schemes used in wireless adhoc
networks in order to handle security threats.
The document discusses different types of wireless networks including Mobile Ad Hoc Networks (MANETs), Wireless Sensor Networks (WSNs), and Vehicular Ad Hoc Networks (VANETs). It provides an overview of the key characteristics of each network type, such as their topology, communication paradigms, and constraints. MANETs allow nodes to connect and communicate in a decentralized manner without infrastructure support. WSNs consist of dense deployments of low-cost sensor nodes that collect and transmit data. VANETs are similar to MANETs but involve vehicle-to-vehicle communication and have more predictable mobility patterns.
This document discusses mobile ad-hoc networks (MANETs). It defines MANETs as collections of wireless mobile nodes that can dynamically form a network without any centralized administration. The document outlines the characteristics, mechanisms, transmission standards, routing protocols, applications, and future aspects of MANETs. It explains that MANETs are self-configuring, infrastructureless networks suitable for situations where fixed networks are not available or are too expensive to deploy.
This document provides an introduction to mobile ad hoc networks (MANETs) and discusses associated research issues. It defines MANETs as infrastructureless, self-configuring networks formed spontaneously by wireless devices. Key characteristics of MANETs include dynamic topology, limited bandwidth, and lack of centralized management. The document outlines several research areas in MANETs, including power management, MAC layer protocols, routing, transport protocols, security, and data management. It discusses challenges in each area posed by the mobile and decentralized nature of MANETs.
This document discusses various research topics related to proactive networking and edge computing. It begins with an outline of topics including edge caching, mobile edge computing (MEC), 5G vehicle-to-everything (V2X), virtual reality (VR), unmanned aerial vehicles (UAVs), and ultra-reliable low-latency communications (URLLC). It then discusses the need to move from reactive to proactive networking approaches to meet new requirements from applications like VR and industry 4.0. Key challenges discussed include time-varying content popularity, hierarchical caching, fog/edge computing with mobility, and ultra-reliable low-latency networking.
This document provides an overview of low-power wide-area networks (LPWAN) for internet of things (IoT) applications. It introduces different LPWAN technologies including LoRa, Sigfox, and NB-IoT and compares their characteristics such as data rates, power consumption, range, and security features. The document also discusses LPWAN standards from various standards bodies and the benefits of using LPWAN networks, concluding that each technology is suited for different IoT use cases depending on cost, battery life, range, and communication needs.
Effects of Shadowing on LoRa LPWAN Radio Links IJECEIAES
LoRaWAN is a long-range, low-power, wireless telecommunications method; expected to play a big role for the Internet of Things. End appliances use LoRaWAN through a single wireless hop to communicate with gateways linked to the Internet that function as transparent bridges relaying messages amongst these end-devices and a central network server. This technology youtes a combination of extended range, low power utilization and protected data communication and is gaining significant traction in IoT networks being deployed by wireless network operators. However, no comprehensive evaluation of the technology exists in the open literature. The main intention of this paper is to investigate the effects of shadowing on LoRaWAN links and analyze the performance in terms of packet loss ratio for different physical layer settings. Results indicate large differences in performance when shadowing is taken into consideration upsetting the expected performance tremendously.
This document provides notes on ad hoc networks from R N S Institute of Technology. It begins with an introduction comparing cellular and ad hoc wireless networks. Ad hoc networks are infrastructureless networks that use multi-hop radio relaying. The document then discusses applications of ad hoc networks such as military operations, emergency response, wireless mesh networks, and wireless sensor networks. It also covers key issues in ad hoc networks including medium access, routing, multicasting, and energy management. The first unit focuses on these introductory concepts and applications of ad hoc networks.
The document summarizes a student project on improving energy efficiency in mobile ad hoc networks (MANETs) using random casting. The proposed approach aims to control overhearing, reduce packet loss, and improve quality of service. Simulation results show the DSR routing protocol performed better than AODV, AOMDV, and DSDV in terms of higher packet delivery ratio and lower packet loss. Future work includes analyzing the performance of the random cast architecture and applying it to more routing protocols and applications in MANET environments.
This document provides an overview of wireless sensor networks and discusses key design considerations. It describes the components of sensor nodes like the Mica mote and issues around sensing and communication ranges. Some key challenges in wireless sensor network design are energy consumption, clustering sensors, and dealing with heterogeneous and mobile sensors. The document outlines many applications of wireless sensor networks and concludes by discussing future research directions.
Definition
A decentralized type of wireless network, allowing people and devices to seamlessly internetwork in areas with no pre-existing communication infrastructure, It can turn the dream of networking at any place and at time into reality. We are almost there by the way .Ex- Bluetooth enabled mobile phones such as 3G, laptops, handheld digital devices, personal digital assistants, or wearable computers
This document discusses wireless communications and ad hoc networks. It begins with an introduction to wireless communications, including the generations of wireless technologies and electromagnetic spectrum used. It then covers wireless computer networks, focusing on wireless local area networks (WLANs) and transmission techniques like infrared and spread spectrum. The document explains the IEEE 802.11 standard architecture, including components like access points, basic service sets, and extended service sets. It discusses security issues and considerations for wireless networks. Finally, it defines ad hoc networks as decentralized peer-to-peer networks without a central access point, set up temporarily to meet immediate needs.
Ad hoc wireless networks operate without an access point in a peer-to-peer mode, while infrastructure networks use an access point. This project investigates the performance of ad hoc networks with minimal channel separation. Ad hoc networks have higher transmission speeds than infrastructure networks due to eliminating network overhead and protocols like four-way handshaking. The purpose is to establish both network types and secure them using authentication methods.
This document discusses introducing IP transport capabilities into the Cello Packet Platform (CPP) telecommunications technology. It notes that voice traffic is being replaced by data traffic, putting new demands on networks to handle both delay-sensitive and packet-oriented traffic. While ATM was considered the solution for quality of service, issues around scalability, administration and cost have emerged. The document outlines six basic principles for IP services in CPP, including embedding an IP router across the main processor cluster and device boards, and fully distributing IPv4/IPv6 forwarding in hardware or software. Introducing IP support in CPP provides benefits to network operators by offering a consistent solution for TDM, ATM and IP transport.
An ad-hoc wireless network is a collection of wireless nodes that can dynamically be set up anywhere and anytime without using an existing network infrastructure or centralized administration. There are different types including wireless mesh networks, wireless sensor networks, and hybrid wireless networks. Wireless mesh networks provide many paths for data transfer between sources and destinations with advantages like high data rates and scalability. Wireless sensor networks consist of sensor nodes that monitor regions without infrastructure by working together. Hybrid wireless networks incorporate properties of multi-hop relaying along with existing infrastructure for higher capacity and flexibility. Applications include monitoring, tracking, location services, and future scopes involve connecting more devices and enabling access to real-world information.
An ad hoc network is a type of wireless network that does not require a central router or base station. Nodes communicate directly with each other or through intermediate nodes in a multi-hop fashion without any fixed infrastructure. Routing and resource management are distributed. Common types include wireless mesh networks, wireless sensor networks, and hybrid wireless networks. Ad hoc networks face challenges related to medium access, routing, security, and resource constraints due to the lack of centralized control.
The document discusses mobile ad-hoc networks (MANETs). It provides an introduction to MANETs and their history. It describes different routing protocols for MANETs including reactive, proactive, and hybrid protocols. It discusses some problems with MANETs and applications of MANETs such as for business meetings. It proposes a solution for secure data transmission in MANETs and concludes with a comparison of MANET routing protocols.
NB-IoT: a sustainable technology for connecting billions of devicesEricsson
Under the umbrella of 3GPP, radio-access technologies for mobile broadband have evolved effectively to provide connectivity to billions of subscribers and things. Within this ecosystem, the standardization of a radio technology for massive MTC applications – narrowband IoT (NB-IoT) – is also evolving. The aim is for this technology to provide cost-effective connectivity to billions of IoT devices, supporting low power consumption, the use of low-cost devices, and provision of excellent coverage – all rolled out as software on top of existing LTE infrastructure. The design of NB-IoT mimics that of LTE, facilitating radio network evolution and efficient coexistence with MBB, reducing time to market, and reaping the benefits of standardization and economies of scale.
The IoT embeds a broad range of MTC applications, and among the different types, massive MTC – including applications like smart metering, agriculture and real estate monitoring – sets a number of performance targets for connectivity. Attempting to meet these IoT targets using a radio-access technology designed for mobile broadband, however, doesn't make economic sense. Networks that provide connectivity to massive MTC applications need a radio-access technology that can deliver widespread coverage and low power consumption, often in signal-challenged locations. Hence the need for narrowband-IoT (NB-IoT).
NB-IoT is a 3GPP radio-access technology designed to meet the connectivity requirements for massive MTC applications, as well as the design targets for IoT including low device cost, extended coverage, 40 devices per household, long battery life, and uplink latency of under 10 seconds.
NB-IoT enjoys all the benefits of licensed spectrum, the feature richness of EPC, and the overall ecosystem spread of 3GPP. At the same time, NB-IoT has been designed to meet the challenging TCO structure of the IoT market.
This articles reveals how NB-IoT is being designed and how it can be deployed in GSM spectrum, within an LTE carrier, or in an LTE or WCDMA guard band.
1. Vehicular ad hoc networks (VANETs) use vehicle-to-vehicle and vehicle-to-infrastructure communication to share safety information, improving road safety.
2. VANETs allow vehicles to form a temporary network without any preexisting infrastructure, distributing real-time information to avoid accidents.
3. Current research focuses on applications for traffic scenarios, as well as addressing challenges relating to network topology, routing mechanisms, security, and minimizing power consumption.
The document discusses ad hoc wireless networks and their applications. It describes key characteristics of ad hoc networks including being self-organizing and lacking centralized administration. It outlines several applications of ad hoc networks such as military operations, emergency response, wireless mesh networks, and wireless sensor networks. It also examines important technical issues for ad hoc networks related to medium access, routing, multicasting, transport protocols, energy management, and deployment considerations.
The document discusses routing protocols and approaches for broadcasting, multicasting, and geocasting in mobile ad hoc networks (MANETs). It describes the broadcast storm problem that can occur when simple flooding is used for broadcasting in MANETs. This results in a large number of redundant rebroadcasts. The document then summarizes various protocols proposed to optimize broadcasting in MANETs, including probability-based, area-based, neighbor knowledge-based, and connected dominating set-based approaches. It also discusses multicasting and geocasting issues and protocols for MANETs.
https://www.ijmst.com/
IJMST Volume 1 Issue 1, Manuscript 4
As the popularity of mobile devices and wireless networks significantly increased over the
past years. The wireless adhoc network has now become one of the most vibrant and active
fields of communication and networking research. These networks are a new generation of
networks offering unrestricted mobility without any underlying infrastructure. As their
principle application is in disastrous environments, security is critical. Various challenges are
faced in the adhoc environment, mostly due to the resource poorness of these networks. One
man confront in the design of these networks is their vulnerability to security attacks. The
solutions for conventional networks are usually not sufficient to provide efficient adhoc
operations. Just because of its wireless nature of communication and lack of any security
infrastructure raise several security problems and threats.
In this paper, we briefly review the threats an adhoc network faces and the security goals to
be achieved. Moreover, it also presents existing security schemes used in wireless adhoc
networks in order to handle security threats.
The document discusses different types of wireless networks including Mobile Ad Hoc Networks (MANETs), Wireless Sensor Networks (WSNs), and Vehicular Ad Hoc Networks (VANETs). It provides an overview of the key characteristics of each network type, such as their topology, communication paradigms, and constraints. MANETs allow nodes to connect and communicate in a decentralized manner without infrastructure support. WSNs consist of dense deployments of low-cost sensor nodes that collect and transmit data. VANETs are similar to MANETs but involve vehicle-to-vehicle communication and have more predictable mobility patterns.
This document discusses mobile ad-hoc networks (MANETs). It defines MANETs as collections of wireless mobile nodes that can dynamically form a network without any centralized administration. The document outlines the characteristics, mechanisms, transmission standards, routing protocols, applications, and future aspects of MANETs. It explains that MANETs are self-configuring, infrastructureless networks suitable for situations where fixed networks are not available or are too expensive to deploy.
This document provides an introduction to mobile ad hoc networks (MANETs) and discusses associated research issues. It defines MANETs as infrastructureless, self-configuring networks formed spontaneously by wireless devices. Key characteristics of MANETs include dynamic topology, limited bandwidth, and lack of centralized management. The document outlines several research areas in MANETs, including power management, MAC layer protocols, routing, transport protocols, security, and data management. It discusses challenges in each area posed by the mobile and decentralized nature of MANETs.
This document discusses various research topics related to proactive networking and edge computing. It begins with an outline of topics including edge caching, mobile edge computing (MEC), 5G vehicle-to-everything (V2X), virtual reality (VR), unmanned aerial vehicles (UAVs), and ultra-reliable low-latency communications (URLLC). It then discusses the need to move from reactive to proactive networking approaches to meet new requirements from applications like VR and industry 4.0. Key challenges discussed include time-varying content popularity, hierarchical caching, fog/edge computing with mobility, and ultra-reliable low-latency networking.
This document provides an overview of low-power wide-area networks (LPWAN) for internet of things (IoT) applications. It introduces different LPWAN technologies including LoRa, Sigfox, and NB-IoT and compares their characteristics such as data rates, power consumption, range, and security features. The document also discusses LPWAN standards from various standards bodies and the benefits of using LPWAN networks, concluding that each technology is suited for different IoT use cases depending on cost, battery life, range, and communication needs.
Effects of Shadowing on LoRa LPWAN Radio Links IJECEIAES
LoRaWAN is a long-range, low-power, wireless telecommunications method; expected to play a big role for the Internet of Things. End appliances use LoRaWAN through a single wireless hop to communicate with gateways linked to the Internet that function as transparent bridges relaying messages amongst these end-devices and a central network server. This technology youtes a combination of extended range, low power utilization and protected data communication and is gaining significant traction in IoT networks being deployed by wireless network operators. However, no comprehensive evaluation of the technology exists in the open literature. The main intention of this paper is to investigate the effects of shadowing on LoRaWAN links and analyze the performance in terms of packet loss ratio for different physical layer settings. Results indicate large differences in performance when shadowing is taken into consideration upsetting the expected performance tremendously.
What are the Benefits of LoRaWAN Technology?
Today, we talk about the seven benefits of LoRaWAN technology application.
In December 2021, LoRaWAN officially became the ITU International Standard for Low Power Wide Area Networks and has been endorsed by the International Telecommunication Union (ITU).
LoRaWAN is developed as an open standard and has been widely recognized by the low power wide area network community. The rapid adoption of this standard for global IoT low-power wide-area networks is a testament to its universality.
LoRaWAN is now a very popular LPWA communication standard that uses unlicensed radio spectrum in the ISM (Industrial, Scientific, Medical) band at frequencies ranging from approximately 433 MHz to 868 MHz, 915 MHz (standards vary around the world).
In the IoT connectivity environment, in addition to smart home networking and office space scenarios, many IoT devices will be connected and communicated in remote environments where the new environment will be inaccessible and require power connections due to M2M transmission coverage limitations.
IRJET- Viability of Smart City Applications with Lora WANIRJET Journal
This document discusses the viability of using LoRa WAN for smart city applications. It summarizes the LoRa WAN technology, including its long range capabilities and low power consumption. It then describes two case studies of using LoRa WAN for air quality and congestion monitoring in London. The results show that LoRa WAN is a feasible low power solution for these types of smart city applications. Battery lifetimes of several years can be achieved, meeting requirements for monitoring networks. Therefore, LoRa WAN shows potential as an effective technology for implementing IoT in smart cities.
NB-IoT VS Lora
This article is talking about NB-IoT VS Lora, comparative analysis of NB-IoT and Lora technology.
The rapid development of the Internet of Things puts forward higher requirements for wireless communication technology. The LPWAN (low-power Wide-Area Network) is also rapidly emerging.
IoT applications need to consider many factors, such as node costs, network costs, battery life, data transmission rate (throughput), latency, mobility, network coverage, and deployment types. It can be said that no single technology can meet all IoT requirements demand.
NB-IoT and LoRa have different technical and commercial characteristics and are also the two most promising low-power wide-area network communication technologies.
Both of these LPWAN technologies have the characteristics of wide coverage, multiple connections, low speed, low cost, and low power consumption. Both are suitable for low-power IoT applications and are actively expanding their ecosystems.
LoRa and NB-IoT are two promising low-power WAN technologies for IoT applications. While both have characteristics of wide coverage, low power consumption and cost, they differ in their technologies. LoRa uses a spread spectrum modulation technique that improves sensitivity and communication distance at low power, while NB-IoT has evolved from 3GPP standards to support efficient transmission of infrequent packets from a large number of devices. Key advantages of LoRa include long communication distances of up to 15km, large system capacity through parallel processing, and positioning capabilities, making it suitable for applications requiring low power and long range.
This document provides a technical overview of LoRa and LoRaWAN. It defines LoRa as the physical layer modulation that enables long-range communication, while LoRaWAN is the communication protocol and network architecture. Key aspects of LoRaWAN covered include the star network topology, support for multiple device classes to optimize battery life and latency, adaptive data rates for high network capacity, and security features. Regional variations of the LoRaWAN specification are described for Europe and North America. Comparisons are made between LoRaWAN and other LPWAN technologies, highlighting LoRaWAN's advantages in areas like battery life, coverage, cost, and ability to support a variety of IoT applications.
This article comprehensively explains low-power wide area network (LPWAN) technology for IoT.
IoT communication technologies are divided into two categories: short-range wireless LAN and low-power wireless WAN (LPWAN), Bluetooth, Wi-Fi, ZigBee, etc. are belong to short-range wireless LAN.
LPWAN is mainly used in long-range, low-bandwidth, low-power, and many connection needs of IoT application scenarios, the hottest LoRa in the market in recent years is the most representative technology in LPWAN. LoRa is the most representative technology in LPWAN.
Non-cellular low-power IoT technology solves the problem of large-scale and wide-coverage network connectivity for IoT applications, which makes up for the shortage of traditional cellular technology and promotes the application of IoT and large-scale deployment. Low-power wide-area networks will carry the burden of communication network economies of scale in the future IoT era.
SCALABILITY CONCERNS OF CHIRP SPREAD SPECTRUM FOR LPWAN APPLICATIONSijasuc
Divergent modulation schemes have been proposed for the Internet of Things (IoT). Low Power Wide Area
Networks (LPWAN) technologies are gaining unprecedented acceptance in IoT application of sensor
networks. Chirp Spread Spectrum (CSS) is a prominent modulation technique proposed for LPWAN. Chirps
can traverse long distance and are resilient to noise and Doppler effects. Noise resilience along with
transmission range and low power requirement makes CSS a preferred modulation scheme for sensor
networks. LoRaWANTM, with its physical (PHY) layer using CSS, has emerged as the widely accepted
LPWAN solution. By using CSS modulation with orthogonal spreading factors (SF), LoRa offers wide
coverage to LPWAN applications while supporting a high volume of devices. However, scalability
performance of CSS has not been inadequately modeled. As with the suitability of the modulation scheme,
there are concerns on how chirps interact with the surrounding as the number of deployments bursts out
into higher volumes. We evaluate CSS at ISM band 868 MHz for spreading factor 7 to 12 at bandwidth 125
kHz for performance and scalability. Simultaneous transmissions were simulated with repeated iterations
and conclusions are arrived on collisions rate, packet error rate, and bit error. Suitability of using CSS for
sensor networks for future deployments is commended.
SCALABILITY CONCERNS OF CHIRP SPREAD SPECTRUM FOR LPWAN APPLICATIONSijasuc
This document discusses the scalability concerns of Chirp Spread Spectrum (CSS) modulation for Low Power Wide Area Network (LPWAN) applications. CSS is a prominent modulation technique used in LPWAN technologies like LoRaWAN. While CSS provides noise resilience, long transmission range and low power requirements making it suitable for sensor networks, its ability to scale to a very large number of simultaneous transmissions has not been adequately modeled. The document aims to evaluate the performance and scalability of CSS at different spreading factors through simulations of simultaneous transmissions over an AWGN channel. Key performance metrics like collision rate, packet error rate and bit error are analyzed to assess the suitability of CSS for future large-scale sensor network deployments.
SCALABILITY CONCERNS OF CHIRP SPREAD SPECTRUM FOR LPWAN APPLICATIONSijasuc
Divergent modulation schemes have been proposed for the Internet of Things (IoT). Low Power Wide Area
Networks (LPWAN) technologies are gaining unprecedented acceptance in IoT application of sensor
networks. Chirp Spread Spectrum (CSS) is a prominent modulation technique proposed for LPWAN. Chirps
can traverse long distance and are resilient to noise and Doppler effects. Noise resilience along with
transmission range and low power requirement makes CSS a preferred modulation scheme for sensor
networks. LoRaWANTM, with its physical (PHY) layer using CSS, has emerged as the widely accepted
LPWAN solution. By using CSS modulation with orthogonal spreading factors (SF), LoRa offers wide
coverage to LPWAN applications while supporting a high volume of devices. However, scalability
performance of CSS has not been inadequately modeled. As with the suitability of the modulation scheme,
there are concerns on how chirps interact with the surrounding as the number of deployments bursts out
into higher volumes. We evaluate CSS at ISM band 868 MHz for spreading factor 7 to 12 at bandwidth 125
kHz for performance and scalability. Simultaneous transmissions were simulated with repeated iterations
and conclusions are arrived on collisions rate, packet error rate, and bit error. Suitability of using CSS for
sensor networks for future deployments is commended.
SCALABILITY CONCERNS OF CHIRP SPREAD SPECTRUM FOR LPWAN APPLICATIONSijasuc
Divergent modulation schemes have been proposed for the Internet of Things (IoT). Low Power Wide Area
Networks (LPWAN) technologies are gaining unprecedented acceptance in IoT application of sensor
networks. Chirp Spread Spectrum (CSS) is a prominent modulation technique proposed for LPWAN. Chirps
can traverse long distance and are resilient to noise and Doppler effects. Noise resilience along with
transmission range and low power requirement makes CSS a preferred modulation scheme for sensor
networks. LoRaWANTM, with its physical (PHY) layer using CSS, has emerged as the widely accepted
LPWAN solution. By using CSS modulation with orthogonal spreading factors (SF), LoRa offers wide
coverage to LPWAN applications while supporting a high volume of devices. However, scalability
performance of CSS has not been inadequately modeled. As with the suitability of the modulation scheme,
there are concerns on how chirps interact with the surrounding as the number of deployments bursts out
into higher volumes. We evaluate CSS at ISM band 868 MHz for spreading factor 7 to 12 at bandwidth 125
kHz for performance and scalability. Simultaneous transmissions were simulated with repeated iterations
and conclusions are arrived on collisions rate, packet er
Orange IoT and LPWA Connectivity White Paper-EN-2018Orange Dev
(1) LoRaWAN and LTE-M are low-power wide-area (LPWA) network technologies that are well-suited for connecting IoT devices that require long range connectivity while minimizing power consumption. (2) LoRaWAN uses license-free spectrum for connectivity solutions that are low-power, low-cost, and provide wide-area coverage for non-critical applications. (3) LTE-M uses licensed cellular spectrum and provides more capabilities like higher speeds, support for mobility and voice, and global roaming, making it suitable for applications requiring real-time connectivity.
The document proposes a new distributed joint queueing (DQ-J) protocol to improve the scalability of LoRa networks. DQ-J aims to reduce the contention overhead of the distributed queueing protocol and achieve balanced traffic loads across multiple channels in LoRa. It introduces an adaptive contention resolution scheme that controls the number of contention slots based on competition. It also presents a load balancing method to distribute data traffic evenly among channels. Analysis shows DQ-J can reduce contention overhead by up to 70% compared to the original DQ protocol and improve throughput by 23% for small payloads. It achieves near-optimal performance irrespective of arrival rates for payloads above 40 bytes in multi-channel LoRa networks.
LPWA - Low power wide area, short for low power wide area technology, using lower power consumption to achieve long-distance wireless signal transmission.
Compared with the familiar low-power Bluetooth (BLE), Zigbee and Wifi technologies, LPWA has a much longer transmission distance, generally at the kilometre level, and its link budget (link budget) can reach 160dBm, while BLE and Zigbee are generally below 100dBm.
Compared with traditional cellular network technologies (2G, 3G), LPWA has lower power consumption, and battery-powered devices can last for several years. Based on these two distinctive features, LPWA can truly enable the Internet of Things (IoT) revolution.
LPWAN - Low power wide area network, i.e. a wireless connection network built with LPWA technology, LPWAN can be connected in various forms.
Hossain markendahl2021 article-comparison_oflpwan_technologiesc july 2021 vvv...VaddiNagaPrasuna
This document compares the cost structures and scalability of various LPWAN technologies for IoT deployments. It presents a framework for assessing the viability of IoT communication technologies. The paper analyzes the inter-technology interference impact on LoRaWAN and Sigfox scalability. It compares the costs of deploying Sigfox, LoRaWAN, NB-IoT, LTE-M and EC-GSM-IoT in both urban and rural scenarios using licensed and unlicensed spectrum. The results validate that a single technology rollout is not cost-efficient, and the scalability of a technology may not be directly related to its cost-effectiveness.
Systematic literature survey: applications of LoRa communicationIJECEIAES
LoRa is a communication scheme that is part of the low power wide area network (LPWAN) technology using ISM bands. It has seen extensive documentation and use in research and industry due to its long coverage ranges of up-to 20 km or more with less than 14 dB transmit power. Moreover, some applications report theoretical battery lives of up to 10 years for field deployed modules utilising the scheme in wireless sensor network (WSN) applications. Additionally, the scheme is very resilient to losses from noise, as well as bursts of interference through its forward error correction (FEC) scheme . Our objective is to systematically review the empirical evidence of the use-cases of LoRa in rural landscapes, metrics and the relevant validation schemes. In addition, the research is evaluated based on (i) mathematical function of the scheme (bandwidth use, spreading factor, symbol rate, chip rate and nominal bit rate) (ii) usecases (iii) test-beds, metrics of evaluation and (iv) validation methods. A systematic literature review of published refereed primary studies on LoRa applications was conducted using articles from 2010-2019. We identified 21 relevant primary studies. These reported a range of different assessments of LoRa with 10 out of 21 reporting on novel use cases. The authors conclude that more work is needed in terms of field testing, as no articles could be found on performance/deployment in Botswana or South Africa despite the existence of LoRa networks in both countries. Thus researchers in the region can research propagation models performance, the energy efficiency of the scheme and MAC layer as well as the channel access challenges for the region.
LoRaWAN technology uses unlicensed spectrum and provides long range connectivity for IoT devices. It uses chirp spread spectrum modulation and supports different data rates and frequency bandwidths depending on regional regulations. LoRaWAN networks have a star topology with IoT devices connecting to gateways and using a central network server. IoT devices are classified into different classes depending on their communication needs, with Class A devices allowing bidirectional communication through scheduled bursts.
After the read, you will learn about what are the differences between Lora vs Zigbee.
What is the result of Lora vs ZigBee?
ZigBee is a low-power local area network protocol based on the IEEE802.15.4 standard. Lora is one of the LPWAN communication technologies. Lora vs ZigBee, Which one is better?
In the following, we will discuss the LoRa vs ZigBee differences, Comprehensive analysis of the technology of LoRa vs ZigBee.
Although many techniques exist to transfer data from the widely distributed sensors that make up the Internet of Things IoT e.g., using 3G 4G networks or cables , these methods are associated with prohibitively high costs, making them impractical for real life applications. LoRa Long Range modulation together with LoRaWAN LoRa Wide Area Networks communication protocol can represent a suitable candidate ensuring a high level of performance in wireless technologies. The objective is to contribute toward the realization of LoRa as a viable communication technology for applications that needs long range links and deployed in a distributed manner. The LoRaWAN networks are the evolution of wireless sensor networks directed to the IoT concept, which entails sensor connectivity to the Internet. LoRa technology is summarized by reviewing some aspects regarding the architecture, security and application of the technology. Ms. Helina Tandel | Ms. Anjali Gharat | Mr. Ketan Bagade "LoRa Technology - DNA of IoT" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-1 , December 2019, URL: https://www.ijtsrd.com/papers/ijtsrd28102.pdf Paper URL: https://www.ijtsrd.com/engineering/computer-engineering/28102/lora-technology---dna-of-iot/ms-helina-tandel
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2. IEEE Communications Magazine • September 2017 35
Together with LoRaWAN, SigFox is one of
the most adopted LPWAN solutions. It is a pro-
prietary UNB solution that operates in the 869
MHz (Europe) and 915 MHz (North America)
bands. Its signal is extremely narrowband (100
Hz bandwidth). It is based on random frequency
and time-division multiple access (RFTDMA) and
achieves a data rate around 100 b/s in the uplink,
with a maximum packet payload of 12 bytes,
and a number of packets per device that cannot
exceed 14 packets/day. These tough restrictions,
together with a business model where SigFox
owns the network, have somewhat shifted the
interest to LoRaWAN, which is considered more
flexible and open.
Cellular Solutions for IoT
The Third Generation Partnership Project (3GPP)
standardized a set of low-cost and low-complexity
devices targeting machine-type communications
(MTC) in Release 13. In particular, 3GPP address-
es the IoT market from a three-fold approach by
standardizing the enhanced MTC (eMTC), nar-
rowband IoT (NB-IoT), and extended coverage
GSM for IoT (EC-GSM-IoT) [9].
eMTC is an evolution of the work developed
in Release 12 that can reach up to 1 Mb/s in the
uplink and downlink, and operates in LTE bands
with a 1.08 MHz bandwidth. NB-IoT is an alter-
native that, thanks to reduced complexity, has
a lower cost at the expense of decreasing data
rate (up to 250 kb/s in both directions). Finally,
EC-GSM-IoT is an evolution of evolved general
packet radio service (EGPRS) toward IoT, with
data rate between 70 and 240 kb/s.
Although the approaches proposed by 3GPP
reduce the energy consumption and cost of the
devices, they have not yet caught up to their non-
3GPP counterparts. For instance, module cost for
LoRaWAN and SigFox is around $2–5 and for
eMTC is still around $8–12. Despite the expected
broad adoption of cellular IoT solutions supported
by 3GPP, LoRaWAN presents some assets that
prevail against these technologies in specific mar-
ket niches. Current assets are:
• The number of LoRaWAN network deploy-
ments is increasing continuously, while on
the other hand, few initial NB-IoT deploy-
ments have already been deployed.
• LoRaWAN operates in the industrial, scientif-
ic, and medical (ISM) band, whereas cellu-
lar IoT operates in licensed bands; this fact
favors the deployment of private LoRaWAN
networks without the involvement of mobile
operators.
• LoRaWAN has backing from industry, includ-
ing CISCO, IBM, and HP, among others. In
the future, both technologies will probably
coexist when 3GPP solutions are backed up
by large volumes.
Overview of LoRaWAN
LoRa is the physical layer used in LoRaWAN. It
features low-power operation (around 10 years
of battery lifetime), low data rate (27 kb/s with
spreading factor 7 and 500 kHz channel or 50
kb/s with FSK) and long communication range
(2–5 km in urban areas and 15 km in suburban
areas). It was developed by Cycleo, a French
company acquired by Semtech. LoRaWAN net-
works are organized in a star-of-stars topology,
in which gateway nodes relay messages between
end devices and a central network server. End
devices send data to gateways over a single wire-
less hop, and gateways are connected to the net-
work server through a non-LoRaWAN network
(e.g., IP over cellular or Ethernet). Communication
is bidirectional, although uplink communication
from end devices to the network server is strongly
favored, as explained in the following [6].
LoRaWAN defines three types of devices (Class-
es A, B, and C) with different capabilities [6]. Class
A devices use pure ALOHA access for the uplink.
After sending a frame, a Class A device listens for
a response during two downlink receive windows.
Each receive window is defined by the duration, an
offset time, and a data rate. Although offset time
can be configured, the recommended value for
each receive window is 1 s and 2 s, respectively.
Downlink transmission is only allowed after a suc-
cessful uplink transmission. The data rate used in
the first downlink window is calculated as a func-
tion of the uplink data rate and the receive win-
dow offset. In the second window the data rate is
fixed to the minimum, 0.3 kb/s. Therefore, down-
link traffic cannot be transmitted until a successful
uplink transmission is decoded by the gateway.
The second receive window is disabled when
downlink traffic is received by the end device in
the first window. Class A is the class of LoRaWAN
devices with the lowest power consumption.
Class B devices are designed for applications with
additional downlink traffic needs. These devices
are synchronized using periodic beacons sent by
the gateway to allow the scheduling of addition-
al receive windows for downlink traffic without
prior successful uplink transmissions. Obviously,
a trade-off between downlink traffic and power
consumption arises. Finally, Class C devices are
always listening to the channel except when they
are transmitting. Only Class A must be imple-
mented in all end devices, and the other class-
es must remain compatible with Class A. In turn,
Class C devices cannot implement Class B. The
three classes can coexist in the same network,
and devices can switch from one class to another.
However, there is not a specific message defined
by LoRaWAN to inform the gateway about the
class of a device; this is up to the application.
The underlying PHY of the three classes is
the same. Communication between end devic-
es and gateways start with a Join procedure that
can occur on multiple frequency channels (e.g.,
in EU863-870 ISM Band there are 3 channels of
125 kHz that must be supported by all end devic-
es and 3 additional 125 kHz channels) by imple-
menting pseudo-random channel hopping. Each
frame is transmitted with a specific spreading fac-
tor (SF), defined as SF = log2 (Rc/Rs), where Rs is
the symbol rate and Rc is the chip rate. Accord-
ingly, there is a trade-off between SF and commu-
nication range. The higher the SF (i.e., the slower
the transmission), the longer the communication
range. The codes used in the different SFs are
orthogonal. This means that multiple frames can
be exchanged in the network at the same time,
as long as each one is sent with one of the six
different SFs (from SF = 7 to SF = 12). Depending
on the SF in use, LoRaWAN data rate ranges from
0.3 kb/s to 27 kb/s.
The three classes can
coexist in the same net-
work and devices can
switch from one class
to another. However,
there is not a specific
message defined by
LoRaWAN to inform the
gateway about the class
of a device and this is
up to the application.
3. IEEE Communications Magazine • September 201736
The maximum duty cycle, defined as the max-
imum percentage of time during which an end
device can occupy a channel, is a key constraint
for networks operating in unlicensed bands.
Therefore, the selection of the channel must
implement pseudo-random channel hopping at
each transmission and be compliant with the max-
imum duty cycle. For instance, the duty cycle is 1
percent in EU 868 for end devices.
The LoRa physical layer uses chirp spread
spectrum (CSS) modulation, a spread spectrum
technique where the signal is modulated by chirp
pulses (frequency varying sinusoidal pulses),
hence improving resilience and robustness against
interference, Doppler effect, and multipath. Pack-
ets contain a preamble (typically with 8 symbols),
a header (mandatory in explicit mode), the pay-
load (with a maximum size between 51 and 222
bytes, depending on the SF), and a cyclic redun-
dancy check (CRC) field (with configurations that
provide a coding rate from 4/5 to 4/8). Typical
bandwidth (BW) values are 125, 250, and 500
kHz in the HF ISM 868 and 915 MHz band, while
they are 7.8, 10.4, 15.6, 20.8, 31.2, 41.7, and
62.5 kHz in the LF 160 and 480 MHz bands. The
raw data rate varies according to the SF and the
BW, and ranges between 22 b/s (BW = 7.8 kHz
and SF = 12) to 27 kb/s (BW = 500 kHz and SF
= 7) [2]. Frequency hopping is exploited at each
transmission in order to mitigate external interfer-
ence [10].
Capacity and Network Size Limitations
In this section we study the LoRaWAN network
scale with respect to data rate, duty cycle regula-
tions, and so on.
Network Size Limited by Duty Cycle
Although the performance of LoRaWAN is deter-
mined by PHY/medium access control (MAC)
overviewed in the previous section, the duty cycle
regulations in the ISM bands [11, 12] arise as a
key limiting factor. If the maximum duty cycle in a
sub-band is denoted by d and the packet transmis-
sion time, known as time on air, is denoted by Ta,
each device must be silent in the sub-band for a
minimum off-period Ts = Ta(1/d – 1). For instance,
the maximum duty cycle of the EU 868 ISM band
is 1 percent, and it results in a maximum transmis-
sion time of 36 s/h in each sub-band for each end
device. Figure 1 shows the time on air of a packet
transmission with coding rate 4/5 over a 125 kHz
BW channel. It is known that large SFs allow lon-
ger communication range. However, as observed
in Fig. 1, large SFs also increase the time on air
and, consequently, the off-period duration. This
problem is exacerbated by the fact that large SFs
are used more often than small SFs. For instance,
considering a simple scenario with end devices
distributed uniformly within a round-shaped area
centered at the gateway, and a path loss calculat-
ed with the Okumura-Hata model for urban cells
[13], the probability that an end device uses an SF
i, pi, would be p12 = 0.28, p11 = 0.20, p10 =0.14,
p9 = 0.10, p8 = 0.08, and p7 = 0.19.
Although Listen Before Talk is not precluded
in LoRaWAN, only ALOHA access is mandatory.
Accordingly, the LoRaWAN capacity can be cal-
culated roughly as the superposition of indepen-
dent ALOHA-based networks (one independent
network for each channel and for each SF, since
simultaneous transmissions only cause a collision
if they both select the same SF and channel; no
capture effect is considered). However, and in
contrast to pure ALOHA, a LoRaWAN device
using SF i cannot exceed a transmitted packet
rate given by nd/Tai, where n is the number of
channels, d is the duty cycle, and Tai is the time on
air with SF i.
In the simple scenario described above, if all
end devices transmit packets at the maximum
packet rate nd/Tai, the number of packets suc-
cessfully received by the gateway decreases, as
shown in Fig. 2, where a network with n = 3 chan-
Figure 1. Time on Air of LoRaWAN with code rate 4/5 and a 125 kHz band-
width.
10 20 30 40 50
0
0.5
1
1.5
2
TimeonAir(s)
MAC payload size (bytes)
SF = 12
SF = 11
SF = 10
SF = 9
SF = 8
SF = 7
Figure 2. Number of packets received per hour when end devices attempt
transmission at nd/Tai packets/s with coding rate 4/5 and n = 3 channels
with 125 kHz bandwidth.
0 500 1000 1500 2000 2500 3000
0
100
200
300
400
500
600
700
800
Numberofreceivedpackets/hourpernode
Number of end devices
Payload: 10 bytes
Payload: 30 bytes
Payload: 50 bytes
4. IEEE Communications Magazine • September 2017 37
nels is analyzed. The number of received packets
drops due to the effect of collisions.
In Fig. 3 the number of packets received suc-
cessfully per hour and end device is shown for
deployments with {250, 500, 1000, 5000} end
devices and n = 3 channels. For low transmission
rate values (in packets per hour), throughput is
limited by collisions; for high values, the maximum
duty cycle prevents end devices from increasing
the packet transmission rate and stabilizes the
throughput. For deployments with a “small” num-
ber of end devices, the duty cycle constraint limits
the maximum throughput.
Table 1 summarizes the maximum throughput
per end device and the probability of successful
reception for a set of different deployments. The
maximum throughput falls as the number of end
devices grows.
Reliability and Densification Drain
Network Capacity
In LoRaWAN, reliability is achieved through the
acknowledgment of frames in the downlink. For
Class A end devices, the acknowledgment can
be transmitted in one of the two available receive
windows; for Class B end devices, it is transmitted
in one of the two receive windows or in an addi-
tional time-synchronized window; for Class C end
devices, it can be transmitted at any time.
In LoRaWAN the capacity of the network is
reduced not only due to transmissions in the down-
link, but also due to the off-period time following
those transmissions (gateways must be compliant
with duty cycle regulation). Therefore, the design of
the network and the applications that run on it must
minimize the number of acknowledged frames to
avoid the capacity drain. This side-effect calls into
question the feasibility of deploying ultra-reliable ser-
vices over large-scale LoRaWAN networks.
At this point of development of the technol-
ogy, LoRaWAN faces deployment trends that
can result in future inefficiencies. Specifically,
LoRaWAN networks are being deployed follow-
ing the cellular network model, that is, network
operators provide connectivity as a service. This
model is making gateways become base stations
covering large areas. The increase in the number
of end devices running applications from different
vendors over the same shared infrastructure poses
new challenges to coordinate the applications.
In particular, each application has specific con-
straints in terms of reliability, maximum latency,
transmission pattern, and so on. The coordination
of the diverse requirements over a single shared
infrastructure using an ALOHA-based access is
one of the main future challenges for the technol-
ogy. Therefore, fair spectrum sharing is required
beyond the existing duty cycle regulations. Finally,
the unplanned and uncoordinated deployment
of LoRaWAN gateways in urban regions, along
with the deployment of alternative LPWAN solu-
tions (e.g., SigFox), could cause a decrease of the
capacity due to collisions and the use of larger
SFs (to cope with higher interference levels).
Use Cases
Several application use cases are considered in
order to analyze the suitability of LoRaWAN and
complement the understanding of the advantages
and limitations of the technology when applied
to different types of data transmission patterns,
latency requirements, scale, and geographic dis-
persion, among others.
Real-Time Monitoring
Agriculture, leak detection, and environment con-
trol are applications with a reduced number of
periodic/aperiodic messages and relaxed delay
constraints. In contrast, the communication range
must be long enough to cope with dispersed loca-
tion of end devices. LoRaWAN has been designed
to handle the traffic generated by this type of
applications and meets their requirements as long
as the deployment of the gateways is enough to
cover all end devices.
On the other hand, industrial automation,
critical infrastructure monitoring, and actuation
require some sort of real-time operation. Real
time is understood in general by low latency and
bounded jitter, and depends on the specific appli-
cation. LoRaWAN technology cannot claim to
be a candidate solution for industrial automation,
considering, for example, that industrial control
loops may require response times around 1–100
ms and that even for small packets of 10 B, the
time on air with SF = 7 is around 40 ms. As pre-
sented in the previous section, due to the MAC
nature of LoRaWAN, deterministic operation
cannot be guaranteed despite application-spe-
cific periodicity as ALOHA access is subject to
contention, which impacts network jitter. Despite
that, small LoRaWAN networks can deliver proper
service to applications that require, for instance,
sampling data every second. To do that, two
main design considerations should be taken into
account:
Figure 3. Number of 10 B payload packets received per hour and node for
{250, 500, 1000, 5000} end devices and n = 3 channels as a function of
packet generation.
0 500 1000 1500 2000 2500 3000 3500
0
50
100
150
200
250
300
350
400
Generated packets per hour per node ()
Numberofreceivedpackets/hourpernode
N = 250
N = 5000
N = 500
N = 1000
Limited
by duty
cycle
5. IEEE Communications Magazine • September 201738
• The spreading factor should be as small as
possible to limit both the time on air and the
subsequent off-period. In other words, the
gateway must be close enough to the end
devices.
• The number of channels must be carefully
designed and must be enough to:
–Minimize the probability of collisions (tightly
coupled with the number of end-devices)
–Offer quick alternative channels for nodes
to retransmit collided packets, thereby dimin-
ishing the impact of the duty cycle
Despite the two aforementioned aspects,
latency will not be deterministic.
Metering
The LoRa Alliance is working on standard encap-
sulation profiles for popular M2M and metering
protocols. Keeping an existing application layer
allows to keep most of the firmware and ecosys-
tem intact, facilitating migration to LPWAN. These
protocols include Wireless M-Bus for water or
gas metering, KNX for building automation, and
ModBus for industrial automation. It is important
to understand that those scenarios range from
time-sensitive operation to best effort monitoring.
Therefore, it is key to identify in such a diverse
ecosystem what the requirements of each appli-
cation are and if LoRaWAN is the appropriate
technology to address them.
Smart City Applications
LoRaWAN has shown key success stories with
smart lighting, smart parking, and smart waste
collection thanks to their scale and the nature of
the data generated by those applications. These
encompass periodic messaging with certain delay
tolerance. For example, smart parking applica-
tions report the status of the parking spots when a
change is detected [14]. Parking events are slow;
therefore, network signaling is limited to a few
tens of messages per day. Analogously, smart
waste collection systems and smart lighting actu-
ate and report information in response to a mea-
sure with large variation periods. Although latency
and jitter are not major issues in these applica-
tions, in some of them the triggering factor is
simultaneous for a huge number of end devices.
For instance, sunset and sundown trigger lighting
elements around the whole city, thereby causing
an avalanche of messages. LoRaWAN is an appro-
priate technology for this use case since it han-
dles the wide coverage area and the significant
number of users at the expense of an increasing
number of collisions, latency, and jitter.
Smart Transportation and Logistics
Transportation and logistics are seen as two major
pillars of the expected IoT growth over the next
few years thanks to their impact on the global
economy. Most applications target efficiency in
areas such as public transportation and transport
of goods. However, some applications are toler-
ant to delay, jitter, and unreliability, and others
are not.
Different standards have been developed in
the 5.9 GHz band for intelligent transportation
systems (ITS) based on the IEEE 802.11p standard.
The constraints on delay are diverse for different
applications, but LoRaWAN, being an LPWAN
solution, is not suitable for these applications. On
the contrary, solutions such as fleet control and
management can be supported by LoRaWAN.
Roaming is one of the developments under
definition within the LoRa Alliance to enhance
mobility. Specifically, a future roaming solution is
expected to support back-end to back-end secure
connections, clearing and billing between opera-
tors, location of end devices (pointed out as an
open research challenge below), and transparent
device provisioning across networks.
Video Surveillance
The most common digital video formats for
IP-based video systems are MJPEG, MPEG-4,
and H.264. The bit rate recommended for IP
surveillance cameras ranges from 130 kb/s with
low-quality MJPEG coding to 4 Mb/s for 1920
1080 resolution and 30 fps MPEG-4/H.264 cod-
ing. Given that LoRaWAN data rate ranges from
0.3 to 50 kb/s per channel, LoRaWAN will not
support these applications.
Open Research Challenges
The effect of the duty cycle stated earlier jeop-
ardizes the actual capacity of large-scale
deployments. This has been initially addressed
by TheThingsNetwork [15], an interesting glob-
al, open, crowd-sourced initiative to create an
IoT data network over LoRaWAN technology.
The proposed solution defines an access policy,
known as the TTN Fair Access Policy, that limits
the time on air of each end device to a maximum
of 30 s/day. This policy is simple to implement
and guarantees pre-defined end-device require-
ments for a large-scale network (more than 1000
end devices per gateway). However, it fails to
provide the network with enough flexibility to
adapt to environment and network conditions
(i.e. link budget of each end device, number of
end devices, number of gateways, etc), as well
Table 1. Maximum throughput and probability of successful transmission for different deployments (with n = 3 channels and 1 percent
duty cycle).
250 end devices 500 end devices 1000 end devices 5000 end devices
Payload (bytes) 10 30 50 10 30 50 10 30 50 10 30 50
Max. throughput per node (packets/hour) 367 217 157 198 117 84 89 53 38 18 10 7.3
Max. throughput per node (bytes/hour) 3670 6510 7850 1980 3510 4200 890 1590 1900 180 300 365
l of the max. throughput (packets/hour) 2620 1500 1090 1500 870 620 670 390 280 130 70 50
Prob. of successful transmission (%) 14.01 14.47 10.73 13.20 13.45 13.55 13.28 13.59 13.57 13.85 14.29 14
6. IEEE Communications Magazine • September 2017 39
as to applications with tight latency or capacity
requirements.
At this stage, the optimization of the capacity
of the LoRaWAN network, as well as the possibil-
ity to perform traffic slicing for guaranteeing spe-
cific requirements on a service basis, remain open
research issues. From the authors’ point of view,
the research community will have to address the
following open research challenges during the
next years.
Explore new channel hopping methods: A
pseudo-random channel hopping method is native-
ly used in LoRaWAN to distribute transmissions
over the pool of available channels, thereby reduc-
ing the collision probability. However, this method
cannot meet traffic requirements when there are
latency, jitter, or reliability constraints (i.e., down-
link acknowledgments for all packets), and it is not
able to be adapted according to the noise level
of each channel. The design of pre-defined and
adaptive hopping sequences arises as an open
research issue. From the authors’ point of view, the
proposed channel hopping sequences should be
able to reserve a set of channels for retransmissions
of critical packets, both in the uplink and in the
downlink (acknowledgment). The design of feasi-
ble feedback mechanisms between gateways and
end devices must be a key part of the approach
in a system where uplink traffic is strongly favored.
TDMA over LoRaWAN: The random nature
of ALOHA-based access is not optimal to serve
deterministic traffic, which is gaining importance
in the IoT ecosystem. Building a complete or
hybrid TDMA on top of LoRaWAN opens up
new use cases for this technology and provides
additional flexibility.The TDMA scheduler should
be able to allocate resources for ALOHA-based
access and schedule deterministic traffic along
time and over the set of available channels. The
proposed schedulers should manage the trade-
off between resources devoted to deterministic
and non-deterministic traffic, meet the regional
duty cycle constraints, and guarantee fairness with
coexisting LoRaWAN networks.
Geolocation of end devices: The location of
end devices is a mandatory requirement for spe-
cific use cases, particularly in Industry 4.0. How-
ever, GPS-based solutions are not feasible due
to cost, and CPU and energy consumption. Cur-
rently, interesting works have been initiated to
develop time difference of arrival (TDOA)-based
triangulation techniques for LoRaWAN. It has
been shown that this approach benefits from
large SFs and dense gateway deployments.
Cognitive Radio: As pointed out earlier, reg-
ulation in ISM bands concerning maximum duty
cycle has a significant impact on the capacity of
the network. One of the most promising future
directions could be the inclusion of cognitive
radio in the LoRaWAN standard. In contrast to
Weightless-W, LoRaWAN has not been designed
to operate in TV white spaces. In the future, the
inclusion of cognitive radio in the LoRaWAN stan-
dard would be subject to a significant reduction
of the energy consumption associated with cogni-
tive radio techniques.
Power reduction for multihop solutions:
LoRaWAN is organized with a single-hop star
topology for simplicity. As discussed earlier, the
impact of high SFs on the capacity of the net-
work is two-fold, since it increases both the time
on air and the off period. A two-hop strategy for
LoRaWAN networks should be investigated to
figure out its potential. Proposals in this direc-
tion should consider the reduction of transmitted
power and the decrease of the SFs. On the other
hand, negative effects such as complexity, syn-
chronization, and increasing power consumption
of relays should also be analyzed to thoroughly
characterize the trade-off.
Densification of LoRaWAN networks: The pro-
liferation of LPWAN technologies, and particularly
LoRaWAN, poses coexistence challenges as the
deployment of gateways populate urban areas.
Given the random-based access in unlicensed
bands of LoRaWAN and its inherent unplanned
deployment, the performance achieved in iso-
lated networks is put into question in scenarios
with coexisting gateways and limited number of
available channels. It is essential to devise coor-
dination mechanisms between gateways from
the same or different operators to limit interfer-
ence and collisions. The coexistence mechanisms
encompass coordination and reconfiguration pro-
tocols for gateways and end devices.
Conclusions
This article is aimed at clarifying the scope of
LoRaWAN by exploring the limits of the technology,
matching them to application use cases, and stat-
ing the open research challenges. In the low-pow-
er M2M fragmented connectivity space there is
not a single solution for all the possible connectiv-
ity needs, and LoRaWAN is not an exception. A
LoRaWAN gateway, covering a range of tens of
kilometers and able to serve up to thousands of end
devices, must be carefully dimensioned to meet the
requirements of each use case. Thus, the combina-
tion of the number of end devices, the selected SFs,
and the number of channels will determine if the
LoRaWAN ALOHA-based access and the maximum
duty cycle regulation fit each use case. For instance,
we have seen that deterministic monitoring and real-
time operation cannot be guaranteed with the cur-
rent LoRaWAN state of the art.
Acknowledgments
This work is partially supported by the Spanish
Ministry of Economy and the FEDER region-
al development fund under SINERGIA project
(TEC2015-71303-R), and by the European Com-
mission through projects H2020 F-Interop and
H2020 ARMOUR.
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Biographies
Ferran Adelantado (ferranadelantado@uoc.edu) received his
engineering degree in telecommunications (2007) and his Ph.D.
degree in telecommunications (2007) from Universitat Politecni-
co de Catalunya (UPC), Barcelona, Spain, and his B.Sc. in busi-
ness sciences (2012) from Universitat Oberta de Catalunya
(UOC). Currently, he is an associate professor at UOC and a
researcher at the Wireless Networks Research Group (WINE).
His research interests are wireless networks, particularly 5G,
LPWAN, and IoT technologies.
Xavier Vilajosana is Principal Investigator of the Wireless Net-
works Research Lab at the Open University of Catalonia. He is
also co-founder of Worldsensing and OpenMote Technologies.
He is an active member of the IETF 6TiSCH WG, where he has
authored different standard proposals. He also holds 30 patents.
He has been a visiting professor at the Prof. Pister University of
California (UC) Berkeley lab. He co-leads Berkeley’s OpenWSN
project. He was a senior researcher at HP R&D Labs (2014–
2016) and a visiting researcher at the France Telecom R&D Labs
Paris (2008). He holds Ph.D.(2009), M.Sc., and M.Eng. (2004)
degrees from UPC.
Pere Tuset-Peiro [M’12] (peretuset@uoc.edu) is an assistant
professor at the Department of Computer Science, Multime-
dia and Telecommunications, and a researcher at the Internet
Interdisciplinary Institute (IN3), both of UOC. He received his
B.Sc. and M.Sc. in telecommunications engineering from UPC in
2007 and 2011, respectively, and his Ph.D. in network and infor-
mation technologies from UOC in 2015. Currently, he has more
than 20 high-impact publications and 7 international patents.
Borja Martinez received his B.Sc. in physics and electronics
Engineering, his M.Sc. in microelectronics, and his Ph.D. in com-
puter science from the Universidad Autónoma de Barcelona
(UAB), Spain. From 2005 to 2015 he was an assistant professor
at the Department of Microelectronics and Electronic Systems
of UAB. He is currently a research fellow at the Internet Inter-
disciplinary Institute (IN3-UOC). His research interests include
low-power techniques for smart wireless devices, energy effi-
ciency, and algorithms.
Joan Melià-Seguí (melia@uoc.edu), Ph.D. (2011), is a lecturer at
the Estudis de Informàtica, Multimèdia i Telecomunicació, and a
researcher at IN3, both at UOC. Before, he was a postdoctoral
researcher at Universitat Pompeu Fabra and the Xerox Palo
Alto Research Center (PARC). He has published more than 30
papers and one patent in the areas of the Internet of Things,
intelligent systems, security, and privacy.
Thomas Watteyne (www.thomaswatteyne.com) is a researcher in
the EVA team at Inria, Paris, and a senior networking design engi-
neer at Linear Technology/Dust Networks in Silicon Valley. He
co-chairs the IETF 6TiSCH working group. He did his postdoctoral
research with Prof. Pister at UC Berkeley. He co-leads Berkeley’s
OpenWSN project. In 2005–2008, he was a research engineer
at France Telecom, Orange Labs. He holds a Ph.D. (2008), an
M.Sc., and an M.Eng. (2005) from INSA Lyon, France.