26-04-2012, 02:13 PM
i-mode -technology and content
wimmer-imode-ihtml.pdf (Size: 131.95 KB / Downloads: 120)
What is i-mode?
● introduced 1999
● multimedia and messaging services ("AOL for mobile phones")
● user pays for data transfer and premium content
● based on WWW standards (TCP/IP, HTTP, HTML)
● Limited Availability
– only for customers of Japanese mobile phone provider NTT
DoCoMo
– technology licensed by European providers (e.g. E-Plus)
– 42 million subscribers in Japan, 4 million worldwide
(stagnating)
● Bandwidth: 9.6 - 28.8 kbit/s (2G), 64/384 kbit/s (3G)
● new features added continually
i-mode as a business model
● NTT DoCoMo has full control over terminals and Official sites
● Official sites (~ 4.000)
– accessible via menu
– partnership with NTT DoCoMo
– have to agree to follow certain guidelines
– can use i-mode's micro-billing
● Unofficial sites
– accessible via URL
– can be provided by everyone
● Micro-billing system (mcommerce)
– payment via mobile phone bill
– 9% fee goes to NTT DoCoMo
● Simple DRM
Standards-based Infrastructure (2)
packet-switched data transfer
● for better performance: wireless-profiled TCP (WTCP,
included in WAP 2.0)
● WTCP is translated to TCP by internet gateways
● content access and e-mail via HTTP
● i-mode compatible HTML (iHTML, extended subset of
HTML) for content
● optional encryption via 40/128 bit SSL