Lecture 2: Facts of network technologies developments

Networking Trends

IntroductionComputer networks:•A computer network is a system of interconnected computers and peripheral devices.

Communication: •Communications is about the transfer of information from a sender, across a distance, to a receiver

•The older forms of communications technology, such as telephones and radios, use analog signals.

•Computers communicate with digital signals.

Top Networking Research Topics 1. Security 2. Mobile Computing 3. Network-based computing

1. Cloud Computing2. Grid Computing3. Internet-of-things (IoT)

4. Voice-over-IP (VoIP)5. Large-scale wireless networks (Sensors, RFID)6. High-speed wireless

Mobile ComputingMobile computing is a generic term describing one's ability to use technology while moving.

Mobile computing involves: mobile communication, mobile hardware, and mobile software.

Mobile Hardware includes mobile devices or device components.

Mobile software deals with the characteristics and requirements of mobile applications.

Communication issues in mobile computing include ad hoc and infrastructure networks as well as communication properties, protocols, data formats and the existing technologies.

Mobile Computing: Items There are at least three different classes of mobile computing items: portable computers, compacted lightweight units including a full character

set keyboard and primarily intended as hosts for software that may be parametrized, as laptops, notebooks, notepads, etc.

mobile phones including a restricted key set primarily intended but not restricted to for vocal communications, as cell phones, smart phones, phonepads, etc.

wearable computers, mostly limited to functional keys and primarily intended as incorporation of software agents, as watches, wristbands, necklaces, keyless implants, etc.

The existence of these classes is expected to be long lasting, and complementary in personal usage, none replacing one the other in all features of convenience..

Mobile Computing: Devices and Limitations Devices Many types of mobile computers have been introduced since the 1990s

including the: Personal digital assistant/enterprise digital assistant Smartphone Tablet computer Ultra-Mobile PC Wearable computer

Limitations Range & Bandwidth Security standards Power consumption Transmission interferences Potential health hazards Human interface with device

Internet-based technologies and services: VoIP VoIP

Voice over Internet Protocol (VoIP) is a general term for a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or  other  packet-switched networks.

Other terms frequently encountered and synonymous with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, and broadband phone.

VoIP Internet telephony refers to communications services including:

voice, fax, and voice-messaging applications-that are transported via the Internet, rather than the public switched telephone network (PSTN).

The basic steps involved in originating an Internet telephone call are: conversion of the analog voice signal to digital format ,

and compression/translation of the signal into Internet

protocol(IP) packets for transmission over the Internet; the process is reversed at the receiving end.

VoIP

VoIP systems employ session control protocols to control the set-up and tear-down of calls as well as audio codes which encode speech allowing transmission over an IP network as digital audio via an audio stream.

Codec use is varied between different implementations of VoIP some implementations rely on narrowband and compressed

speech, while others support high fidelity stereocodes

Cloud Computing Cloud computing is the

delivery of computing as a service rather than a product, whereby shared resources, software, and information are provided to computers and other devices as a utility (like the electricity grid) over a network (typically the Internet). Clouds can be classified as public, private or hybrid.

Cloud Computing Cloud computing relies on sharing of resources to achieve

coherence and economies of scale, similar to a utility (like the electricity grid) over a network.

At the foundation of cloud computing is the broader concept of converged infrastructure and shared services.

Cloud computing, or in simpler shorthand just "the cloud", also focuses on maximizing the effectiveness of the shared resources.

Cloud resources are usually not only shared by multiple users but are also dynamically reallocated per demand. This can work for allocating resources to users.

The Internet of Things The Internet of Things (IoT)

refers to the interconnection of uniquely identifiable embedded computing-like devices within the existing Internet infrastructure.

The Internet of things We have passed the threshold where more things are connected

to the Internet than people. The transition to IPv6 also supports seemingly limitless

connectivity. Cisco IBSG predicts the number of Internet-connected things

will reach 50 billion by 2020, which equates to more than six devices for every person on Earth.

Many of us in the developed world already have three or more full-time devices connected to the Internet when factoring in PCs, smartphones, tablets, television devices and the like.

The Internet of Things Things, in the IoT, can refer to a wide

variety of devices such as heart monitoring implants, biochip transponders on farm animals, automobiles with built-in sensors, or field operation devices that assist fire-fighters in search and rescue.

Future IoT? IoT of sensor networks, using low-power sensors that "collect, transmit, analyze and distribute data on a massive scale," says Evans.

The Internet of Things Typically, IoT is expected to offer advanced connectivity

of devices, systems, and services that goes beyond machine-to-machine communications (M2M) and covers a variety of protocols, domains, and applications.

IoT Applications : Environmental Monitoring, Infrastructure Management,

Industrial Applications, Energy Management, Medical and Healthcare Systems, Building and Home Automation, Transport Systems, Large Scale Deployments

IoT Trends: Intelligence, Architecture, Complex system

Wireless Sensor Networks (WSNs)

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A sensor network is a wireless network that consists of thousands of very small nodes called sensors.

Base station

Figure 1: Architecture of wireless sensor networks

Wireless Sensor Networks (cont.) WSN Sensors are equipped with sensing, limited

computation, and wireless communication capabilities.

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Typical hardware components of a sensor node in wireless sensor networks

WSNs Applications

18 WSNs Applications

WSNs Challenges

Limited Sensor Resources Battery power, computation capability, memory, etc.

Networking Challenges Limited bandwidth, routing, multi-hop communication,

mobility, topology control, large no. of sensors, frequent node on/off, etc.

Environment/Application-Driven Challenges Requirements, extreme conditions, interference, etc.

Other Challenges Security, synchronization, localization, deployment..

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Next Lecture! Quiz: Lectures 1 & 2