Sheeraz A. Alvi

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Internet of Things (IoT) envisions the notion of ubiquitous connectivity of `everything'. However, the current research and development activities have been restricted to scalar sensor data based IoT systems, thus leaving a gap to benefit from services and application enabled by `multimedia things' or Internet of Multimedia Things (IoMT). Moreover, a(More)
Internet of Things (IoT) systems cannot successfully realize the notion of ubiquitous connectivity of everything if they are not capable to truly include ‘multimedia things’. However, the current research and development activities in the field do not mandate the features of multimedia objects, thus leaving a gap to benefit from multimedia content based(More)
In several use-cases of Internet of Things (IoT), IEEE 802.11 based WLANs are more favorable due to superior data rate support even though their energy efficiency is not up to the mark. Particularly, wireless multimedia sensors based WLANs demand higher energy resources. In this regard, various IEEE 802.11 based power saving mechanisms are developed. IEEE(More)
Recent advancements in PHY data rates of communication technologies require efficient MAC mechanisms. IEEE 802.11 MAC compels nodes to defer transmissions to avoid collisions and maintain random and fair channel access. Contention time degrades network performance in terms of bandwidth and delays; this problem exaggerates at higher data rates. In this(More)
Devices in Low Power and Lossy Networks (LLNs) based Internet of Things (IoT) systems have energy, memory and processing constraints. For LLNs, IETF standardized a light-weight routing protocol referred to as RPL. The energy efficiency of RPL routing protocol has been under investigation in prior studies but its stability issue is recently identified. The(More)
Development of Low-power Low-rate wireless Networks (LLNs) based systems is prodigiously escalated, which helps realizing the notion of Internet of Things (IoT). Routing Protocol for Low-power and Lossy Networks (RPL) is the standard routing protocol for IPv6 LLNs. RPL has gotten tremendous appreciation due to its flexibility and adaptiveness to support(More)
In low-power low-rate wireless networks, IEEE 802.15.4 is a standard protocol for communication. Devices in such networks are usually battery-operated so radio-transceiver component in such networks are typically of low range but most power consuming. Proper antenna orientation, distance between nodes and channel selection are among the ways to achieve(More)
IEEE 802.11 standard backoff mechanism is vulnerable to selfish MAC layer misbehavior. A greedy node cheating on backoff rules can attain higher bandwidth and cause unfairness among nodes. In addition, selfish behavior is severe when honest nodes use longer contention window size. Contention overhead and unshared backoff value makes backoff mechanism(More)
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