Sheeraz A. Alvi

Learn More
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)
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)
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)
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)
  • 1