Chapter 10 wireless, mobile connection

Wireless fidelity (Wi-Fi)

For wireless LANs (WLANs) IEEE Standard 802.11a, b, g, n, ac

broadcast transmission

-Sending signals to many receivers at one time -Subject to propagation delay and environmental influences

line-of-sight (microwave)

-Transmitter and receiver are in view of each other -Due to curvature of the earth, microwave towers cannot be spaced more than 30 miles apart

Radio frequency (RF) jamming

A person or a device intentionally or unintentionally interferes with your wireless network transmissions

mifi

A small, portable wireless device that provides users with a permanent Wi-Fi hotspot wherever they go

Quick response (QR) codes

A two-dimensional code, readable by dedicated QR readers and camera phones Improvements over traditional bar code

Super Wi-Fi

A wireless network proposal that creates long-distance wireless Internet connections

Types of RFID tags

Active tags Passive tags

Advantages and disadvantages of radio transmmition

Advantages Signals can travel through objects (no line-of-sight) Require inexpensive devices Support high-speed data transmission Disadvantages Possible electrical interference problems Signal can be intercepted by anyone with similar equipment using the same frequency

Rogue access point

An unauthorized access point to a wireless network Evil twin attack: User connects to a malicious access point where an attacker could intercept confidential information

Short-range wireless network

Blue tooth, Ultra Wideband, near-field communications

Wide Area Wireless network

Cellular radio network Wireless broadband

Satellite transmission

Compared to microwave systems, satellite has much larger footprint, needs line of sight

Eavesdropping

EavesdroppingEfforts by unauthorized users to try to access data traveling over wireless networks

3 main types of satellite

Geostationary (GEO) Tv signal, satellite radio Medium-earth-orbit (MEO) GPS Low-earth-orbit (LEO) telephone or iridium global star

Ultra-wideband (UWB)

High-bandwidth wireless technology with transmission speeds in excess of 100 mbps Examples: Timedomain, Parking

ubiquitous computing

Invisible "everywhere computing" that is embedded in the objects around us

Bluetooth

Link up to eight devices within a 30-foot area and transmit up to 2.1 mbps

War driving

Locating WLANs while driving around a city or elsewhere

5 ways m-commerece can benefit a business

Location based Apps, Financial services, Inta Business Applications, Accessing information,Telemetry Aplications

Location-based applications and services

Location-based advertising Sending user-specific advertising messages concerning nearby shops, malls, and restaurants to consumers' wireless devices Example: NAVTEQ Location-based services Provide information that is specific to a given location Example : CM-map

Advantages and disadvantages of wireless media

Microwave (A) High bandwith, inexpensive (D) unobstructed line of sight, susceptible to environmental factors Satellite (A) High Bandwith, large coverage area (D) Expensive, must use encryption, signal delay, unobstructed line of sight Radio (A) High Bandwith,pass through walls,inexpensive and easy to install (D) Electrical interference problems, Security Infrared (A)Low to medium bandwith,only short distances (D)must ahve unobstructed line of sight.

Financial services

Mobile banking, Wireless payments, Micropayments, Wireless wallets, Bill payment services

Accessing information

Mobile portal: A Web site with an audio interface that can also be accessed through a standard phone or cell phone; Example: iPing Voice portal: Same as mobile,but it can be accessed by voice

Mobile computing

Real-time, wireless connection between a mobile device and other computing environments, such as the Internet or an intranet

Wireless Security

Rogue access point war driving eavesdropping Radio frequency jamming

Near-field communications (NFC)

Shortest range of any wireless network Embedded in mobile devices such as cell phones and credit cards

Wi-Fi direct

Support peer-to-peer communications similar to Bluetooth

Wireless broadband

Two-way radio communications over a cellular network of base stations with seamless handoffs

Five value-added attributes:

Ubiquity-Connect anywhere regardless of user's location Convenience and Instant connectivity-Easy and fast access to the Web, intranets, and other mobile devices Personalization-Information can be customized and sent to individual consumers Localization of products and services-Knowing a user's location helps companies advertise their products and services

Infrared

Use for short-distance connections, humans cannot see. TV's, VCR's Ect.

Wireless mesh networks

Use multiple Wi-Fi access points to create a wide area network

Mobility

Users can initiate a real-time contact with other systems from anywhere using a mobile device

Broad reach

Users with a mobile device can be reached instantly

Radio transmission

Uses radio-wave frequencies to send data directly between transmitters and receivers

Radio Frequency Identification

Uses tags with microchips containing data and antenna to transmit radio signals over a short distance to a RFID reader

Intrabusiness applications

Using wireless technology within an organization

Microwave transmission systems

Widely used for high-volume, long-distance, point-to-point communication

Factors enabling m-commerce

Widespread availability of mobile devices Declining prices of wireless devices Bandwidth improvement

medium range wireless networks

Wireless fidelity (Wi-Fi) ,Wi-Fi direct,Super Wi-Fi,Wireless mesh networks,mifi

Telemetry applications

Wireless transmission and receipt of data gathered from remote sensors (find my iPhone)

Cellular radio network

Worldwide Interoperability for Microwave Access (WiMAX) IEEE Standard 802.16 Provides wireless access range of up to 31 miles

Hotspot:

a geographical perimeter with in which a wireless access point provides wireless access for users

Wireless sensor networks (WSNs)

are networks of interconnected, battery-powered, wireless sensors that monitor environmental or physical conditions

Wireless network interface card

enables mobile devices to communicate wirelessly.

Mobile commerce

refers to electronic commerce transactions that are conducted in a wireless environment, especially via the Internet.

Radio frequency identification (RFID)

technology allows manufacturers to attach tags with antennas and computer chips on goods and then track their movement through radio signals.