A Survey of Application Protocols for Wireless Devices

1
A Survey of Application Protocols for Wireless
Devices

• Éric Lesage

2
Introduction

• SMS
• HDML
• I-mode
• WAP
• LEAP
• Summary
• Conclusion

3
SMS (Short Message Service)

• Used to send messages from one device to another
• Gateways from and to Internet e-mail
• Very popular, particularly in Europe

4
HDML (Handheld Device Markup Language)
ltHDML version"3.0" markable"true"gt ltCHOICE
name"main" key"pgtarg"gt ltACTION type"accept"
task"go" dest"/redirs_hd3.hdml?pgtarg(pgtarg)"
gt ltACTION TYPE"SOFT1" LABEL"ABOUT" taskgosub
dest"/hd3/about.hdml"gt ltACTION TYPE"help"
taskgosub dest"/hd3/help.hdml?helpindex"gt ltLINE
gtINFOSPACE ltce task"go" dest"/hd3/my.hdml?r255
69" RELNEXTgtMy InfoSpace ltCE task"go"
dest"direc"gtDirectories ltCE value"invi"gtFinance
ltCE value"spti"gtSports ltCE
value"funst"gtEntertainment ltCE
value"nwsi"gtNews ltCE value"weat"gtWeather
ltCE value"ylwdir"gtDirections lt/CHOICEgt ltCHOICE
name"direc" key"pgtarg"gt ltACTION type"accept"
task"go" dest"/redirs_hd3.hdml?pgtarg(pgtarg)"
gt ltACTION label"DONE" type"soft1" task"go"
dest"main"gt ltWRAPgtDIRECTORIES ltCE
value"ppli"gtWhite Pages ltCE value"ylwi"gtYellow
Pages ltCE value"pplrl"gtReverse Lookup ltCE
task"go" dest"http//yp.infospace.com/hd3/yel/fi
nders.hdml?yp_fNr25569"gt Finders lt/CHOICEgt lt/HD
MLgt
5
I-mode
lthtmlgtltheadgt ltMETA http-equiv"Content-Type"
content"text/html charsetx-sjis"gt ltMETA
name"CHTML" content"yes"gt ltMETA
name"description" content"????????????"gt lttitlegt
(?)??????????lt/titlegtlt/headgt ltbody
bgcolor"ffffff" text"000000"gt ltcentergt
??????????ltbrgt eurotechnologyltbrgt lt/centergt lthrgt ?
????ltbrgt ltA HREF"http//eu-japan.com/i/index.htm
l" accesskey"1"gt63879lt/Agt??????ltBRgt ltA
HREF"eurotechnologyj.html" accesskey"2"gt63880lt
/Agt????ltBRgt ltA HREF"eurotechnologye.html"
accesskey"3"gt63881lt/AgtEnglishltBRgt lthrgt ltcentergt
ltA hrefmailto_at_docomo.ne.jp? bodyhttp//www.eur
otechnology.com/i/index.htmlgt?????lt/agtltbrgt
copy2000??????????ltBRgt lt/centergtlt/bodygtlt/htmlgt
6
WAP (Wireless Application Protocol)

• The most widely-known solution (but not the most
  widely used)
• Works on practically any bearer (including
  non-IP)
• Complete protocol stack (not just application
  level)
• Heavily criticized

7
LEAP (Lightweight and Efficient Application
Protocol)

• Underdog effort unlike WAP, no massive
  corporative support
• Focus on messaging solutions
• Works using a binary remote procedure call
  protocol (ESRO efficient short remote operation
  protocol)
• Using EMSD (Efficient Mail Submission and
  Delivery Protocol), sending a short message
  requires 3 transmission, instead of at least 9
  using TCP and SMTP.

8
LEAP Protocols
EMSD
EHTD

ESRO
UDP or equivalent
IP
Bearer
9
Summary
10
Conclusions

• 3G (UMTS, GSM GPRS, etc.) networks are IP based
  is the WAP proxy model still justified?
• WAP XHTML and maybe TCP in next version
  protocol stack slowly starting to erode.
• LEAP good idea, but no real taker so far.
• i-mode based on HTML future lies in XML
  however, much richer experience (video on 3G
  Java games, etc.)