Chapter 6 - Wireless internet and m-business. In this chapter we will discuss: Wireless devices, m-business, wireless internet access, wireless web technology, software applications for wireless devices, wireless local area networks (WLANs), bluetooth, wireless communications, location tracking, future of wireless internet.
Trang 16.11 Future of Wireless Internet
6.11.1 Implications for Disabled People 6.11.2 Ultimate Wireless Device
Trang 3• Wireless development
– Firstgeneration wireless technology was the cellular phone – Second generation wireless technology, which includes
digital cellular phones, is currently in use worldwide
– Third generation, or 3G technology will enable wireless
devices to send and receive data as much as seven times faster than a standard 56K modem
• Wireless devices
– Personal digital assistants (PDAs)
– Digital cellular phones
– Twoway pagers
Trang 4• Outside the United States, mobile phones are the preferred medium for getting information and making ebusiness transactions
• Service is not universally available and still
relatively expensive
• Limited bandwidth restricts the amount of data that can be sent over the wireless network
• Wireless devices have significantly smaller
memory capacity and less powerful processors
Trang 5• mBusiness
– eBusiness using wireless devices with Internet access – B2C marketplace
• Increased conveniences for consumers
• Frequent, small transactions
• Receiving news, sports scores, email, coupons and advertisements
– B2B marketplace
• Salespeople can access product databases and place orders
• Address customer needs immediately
• Ordering and billing will be conducted remotely
Trang 6• Blackberry
– BlackBerry Exchange Edition
– BlackBerry Internet Edition
Trang 7Blackberry Home Page (Courtesy of Research in Motion Limited The Blackberry and RIM families of related marks, images and symbols are the exclusive property of, and trademarks of Research in Motion Limited, used by permission.)
Trang 8• Code Division Multiple Access (CDMA)
– Each transmission is assigned a specific channel, giving the transmission the benefit of the entire bandwidth within that channel and reducing the possibility that a connection will
be broken – Able to assign each transmission on the network a unique code to ensure security
• Global System for Mobile Communications (GSM)
– Uses Time Division Multiple Access (TDMA) which takes multiple calls and assigns each call to a different time slot on the same radio frequency
Trang 10• Sprint PCS
– A nationwide network that offers an array of wireless solutions for both business and personal applications
• Wireless Web Updates
Trang 11• GoAmerica
– Wireless Internet service provider
– Services include Internet access, Web browsing and email capabilities for a variety of wireless devices, including PDAs and twoway pagers
• Go.Web
– Wireless Web browser gives users access to email and Web– Compresses sites to reduce download time
• MyGo.Web
– Allows users to access information specific to their needs
Trang 12• Three technologies are used to provide Web access to wireless devices
– Wireless Application Protocol (WAP)
– Web clipping
– Microsoft’s Pocket Internet Explorer
Trang 13• Web clipping
– Allows users to take relevant pieces of a Web site and
deliver it to a wireless device, eliminating excess content and graphics
– Palm devices use Web clipping
• Proxy server
– Lies between client (such as a Web browser) and Web server– Query is received by a proxy server controlled by the
wireless ISP– Proxy server goes to the Web site and “clips” the necessary data
• The proxy server transmits the data back to your wireless device
• If the proxy server does not have the information, it passes the request to the regular server
Trang 15Palm Web Clipping Applications Library. (Courtesy of Palm, Inc.)
Trang 166.5.1 Personal Digital Assistants
Trang 17– Designed to standardize development across different
wireless technologies worldwide – Intended primarily for Internetenabled digital phones,
pagers and other handheld devices– Uses Web sites specifically designed for wireless handheld devices that have small screens and lowbandwidth
constraints
Trang 18• Wireless Markup Language (WML)
– The scripting language used to create Web content to be
delivered to wireless handheld devices, based on XML – Removes “unnecessary” content from Web pages
– WML tags are used to “mark up” a Web page to specify how the page should be formatted on a wireless device
– WML works with the WAP to deliver the content
– Similar to HTML, but it does not require input devices
• Microbrowsers
– Designed with limited bandwidth and limited memory
Trang 19• How wireless Internet works:
– A WAP gateway, which acts as a proxy server, receives the request, translates it and sends it to the appropriate Internet server
– Server responds by sending the requested WML document– The WAP gateway parses this document's WML (i.e., it
analyzes the WML document, checking it for correctness) and sends the proper text to the digital phone
Trang 206.5.2 WAP and WML
Trang 21• Microsoft Pocket Internet Explorer
– Reformats complete Web pages as they are downloaded
from the Internet for display on the Pocket PC– Allows Pocket PC users to access most of the content
currently available on the Web and eliminates the need to tailor Web content for delivery to handheld devices
• PacketVideo
– Specializes in wireless video technology for mobile devices
Trang 22Devices
Trang 23Devices
Microsoft’s Pocket Internet Explorer. (Courtesy of Microsoft Corporation
Trang 24Devices
Trang 25• Easier to install and maintain without disrupting
an office
• Computers can easily be moved without having to install a new network connection in each location
Trang 26technology)
Trang 27• Bluetooth
– A wireless technology that provides shortrange, highspeed voice and data communication between digital devices
– Conceived by Ericsson in 1994
– Provides up to 1 Mbps (megabits per second) of data transfer capability between devices as much as 30 feet apart
– Can also be used to create wireless offices
• Bluetooth Special Interest Group
– Initially comprising Ericsson, IBM, Intel, Toshiba and Nokia– Developed an open specification for the technology and to encouraged crossplatform capabilities for the different wireless devices
Trang 28• Wireless communications can be unreliable and slow, wirelessdevice bandwidth is about one fifth
Trang 29• Location tracking
– Can be used for navigation, such as GPS (Global Positioning System) devices installed in cars
– Can be used by shipping companies to track delivery trucks, giving customers more accurate tracking information and expected delivery time
– Can also be used for targeted marketing
• NEAR magazine
Trang 30(GPS)
• Developed by the United States Department of Defense for military purposes, now used in commercial devices
• Triangulation
– Three (of four) satellites are used to determine the latitude,
Trang 31• Federal Trade Commission (FTC) E911 Act
– Designed to standardize and enhance 911 service across
mobile devices – Improve emergency response time to 911 calls placed using cellular phones
– Requires all wireless cellular carriers to provide Automatic Number Information (ANI)
– Mandates that all mobilephone carriers provide Automatic Location Identification (ALI)
• Disabilities Issues Task Force
– Provide hearing and speechimpaired people with access to
911 service through mobile devices
Trang 32• Benefits
– Emergency response teams can accurately locate callers, improving response time
– Emergency response teams can accurately locate if a call is breaking up or the caller cannot be understood by the
emergency operator– Locate friends nearby
– Obtain uptotheminute traffic information
• Challenges
– Constant tracking abilities threaten privacy
Trang 33• Decreasing cost and size of wireless phones and mobile devices
• Improving technology
• Increasing number of devices made wireless
• Increased venture capitalist interest in wireless technology
Trang 34People
• Navigational capabilities for people with visual disabilities
– Communication between traffic signals and wireless device
• Text displays of verbal communication for people with hearing disabilities
• Closecaptioned broadcasting to television and
radio
• Patients with Alzheimer’s
– Exact location, the location of the nearest police station and
Trang 35• Builtin GPS System