Khaled Hassan

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Verified

Khaled verified their affiliation via an institutional email.

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• PhD
• Wireless Systems Architect at Analog Devices, Inc.

In this paper, we present results of a study of the data rate fairness among nodes within a LoRaWAN cell. Since LoRa/LoRaWAN supports various data rates, we firstly derive the fairest ratios of deploying each data rate within a cell for a fair collision probability. LoRa/LoRaWAN, like other frequency modulation based radio interfaces, exhibits the...

Direct-to-Satellite IoT (DtS-IoT) is a promising approach to deliver data transfer services to IoT devices in remote areas where deploying terrestrial infrastructure is not appealing or feasible. In this context, low-Earth orbit (LEO) satellites can serve as passing-by IoT gateways to which devices can offload buffered data to. However, transmissio...

LoRa is a low-power and long range radio communication technology designed for low-power Internet of Things devices. These devices are often deployed in remote areas where the end-to-end connectivity provided through one or more gateways may be limited. In this paper, we examine the case where the gateway is not available at all times. As a consequ...

Low Power Wide Area Networks (LPWANs) such as LoRaWAN, Sigfox, and NBIoT present a novel communication paradigm, which complements the traditional short-range Wireless Sensor Networks (WSNs). LPWANs promise to provide wide-area connectivity (up to tens of kilometers) and low-power operations (up to 10years) for a massive number of low-cost devices....

Automation and data capture in manufacturing, known as Industry 4.0, requires the deployment of a large number of wireless sensor devices in industrial environments. These devices have to be connected via a reliable, low-latency, low-power and low operating-cost network. Although LoRaWAN provides a low-power and reasonable-cost network technology,...

Embedded software management requirements due to concerns about security vulnerabilities or for feature updates in the Internet of Things (IoT) deployments have raised the need for Firmware Update Over The Air (FUOTA). With FUOTA's support, security updates, new functionalities, and optimization patches can be deployed with little human interventio...

LoRaWAN promises to provide wide-area network access to low-cost devices that can operate for up to ten years on a single 1000-mAh battery. This makes LoRaWAN particularly suited for the data collection applications (e.g., monitoring applications), where device lifetime is a key performance metric. However, when supporting a large number of devices...

LoRa/LoRaWAN enables long-range links, which result in anisotropic propagation around the gateway as the links are likely to experience different environments. This property is not captured by popular distance based channel models, which makes them inaccurate to estimate LoRaWAN coverage. An alternative is conducting a site survey to build a path l...

LoRa-based transmissions suffer from extensive collisions due to the ALOHA-style transmission policy. As a consequence , delivering a high number of packets in a short amount of time becomes an unfeasible task. To tackle this problem we propose to schedule node transmissions in slots of different size depending on the Spreading Factor (SF). Transmi...

LoRaWAN promises to provide wide-area network access to low-cost devices that can operate for up to 10 years on a single 1000 mAh battery. This makes LoRaWAN particularly suited to data collection applications (e.g. monitoring applications), where device lifetime is a key performance metric. However, when supporting a large number of devices, LoRaW...

Header compression is the key to adapt long header protocols like IPv6 for transmission over short frame size networks such as Low Power Wide Area Networks (LPWANs). Over LPWANs only one or two octets may be available to transmit the upper layer headers, which makes known header compression mechanisms unsuitable. Static Context Header Compression (...

LoRaWAN exhibits several characteristics that can lead to an unfair distribution of the Data Extracted Rate (DER) among nodes. Firstly, the capture effect leads to a strong signal suppressing a weaker signal at the gateway and secondly, the spreading codes used are not perfectly orthogonal, causing packet loss if an interfering signal is strong eno...

Supporting IPv6/UDP/CoAP protocols over Low Power Wide Area Networks (LPWANs) can bring open networking, interconnection, and cooperation to this new type of Internet of Things networks. However, accommodating these protocols over these very low bandwidth networks requires efficient header compression schemes to meet the limited frame size of these...

This poster illustrates the problem statement, the motivation, and the challenges of bringing the Internet technologies into Low Power Wide Area Networks (LPWANs) domain.

In this study, the authors tackle the dynamic spectrum access (DSA) problem for primary operators (POs) for long-term evolution-advanced (LTE-A) systems. They propose an auction-based DSA framework that exploits the capabilities of carrier aggregation to efficiently utilise the under-utilised spectrum which varies with time and space. Their propose...

Billions of devices are projected for deployment in the Internet of Things (IoT). Deploying these devices and their associated services is impossible manually, thus a seamless and scalable service discovery mechanism is mandatory for realizing the IoT vision. In this paper, we propose a lightweight application-layer service discovery protocol for I...

Internet of Things (IoT) is the world where the physical devices are seamlessly integrated into the Internet. Experts estimate that billions of devices offering some form of services are projected for deployment in the IoT. Deploying this huge number of devices and their associated services is impossible with human intervention, thus an automatic s...

In this paper, we present the multicast-forwarding scheme called, Enhanced Stateless Multicast RPL Forwarding (ESMRF). ESMRF is a new scheme allow nodes be able to send multicast traffic up and down the Routing Protocol for Low-power and Lossy networks (RPL) tree. In contrast Stateless Multicast RPL Forwarding (SMRF) scheme has a limitation on its...

In this paper, we address dynamic spectrum access for Primary Operators (POs) for LTE-Advanced systems. We propose a dynamic spectrum access framework that exploits the capabilities of carrier aggregation to efficiently utilize the unutilized spectrum which varies with time and space when static spectrum access policies are adopted. A spectrum owne...

We present the “IoTified” platform as a true Web of Things (WoT) platform based on IPv6. The platform is comprised of off-the-shelf hardware components such as Raspberry PI and Zolertia Z1. A device-area network, based on but not limited to IPv6/IEEE 802.15.4 (6LowPAN), is connected to the Internet cloud via a gateway. In the device-area network, t...