Thomas Kunz
Systems and Computer Engineering
33
i-mode: First of all a
Business Model!
nAccess to Internet services in Japan provided by NTT
DoCoMo
–Services
nEmail, short messages, web, picture exchange, horoscope,
...
–Big success
– more than 30 million users
nMany use i-mode as PC replacement
nFor many this is the first Internet contact
nVery simple to use, convenient
–Technology
n9.6 kbit/s (enhancements with 28.8 kbit/s), packet
oriented (PDC-P)
nCompact HTML plus proprietary tags, special transport
layer (Stop/go, ARQ, push,
connection oriented)
PDC-P
TL
HTTP(S)
cHTML + tags
mobile terminal
PDC-P
TL
mobile network
gateway
content provider
L1
L2
IP
TCP
L1
L2
IP
TCP
L1
L2
IP
TCP
L1
L2
IP
TCP
HTTP(S)
cHTML + tags