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Wireless Application Protocol Intro (Continued)

Wireless Application Protocol Intro (Continued). WebTP Meeting H. Wilson So 28 Feb, 2000. Outline. Recap: What is Wireless Application Protocol? Architecture Overview Wireless Session Protocol Wireless Application Environment architecture (WML & WML-Script). Recap. … from last week.

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Wireless Application Protocol Intro (Continued)

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  1. Wireless Application Protocol Intro (Continued) WebTP Meeting H. Wilson So28 Feb, 2000.

  2. Outline • Recap: What is Wireless Application Protocol? Architecture Overview • Wireless Session Protocol • Wireless Application Environment architecture (WML & WML-Script)

  3. Recap … from last week

  4. What is WAP? • "WAP specifies an application framework and network protocols for wireless devices such as mobile telephones, pagers, and personal digital assistants (PDAs)." • WAP defines its own set of protocols but models after existing web protocols.

  5. GSM, CDMA, IS-136 WDP (datagram) WTLS (security) WTP (transaction) WSP (session) WML (markup) WML Script (scripting) IP UDP TLS (from SSL) no counterpart HTTP HTML JavaScript WAP vs. IP world Rationale: reuse as much as possible from IP world, but optimize for the wireless world (i.e. compression, adapt to high-loss rate.)

  6. WAP Protocol Architecture

  7. Protocol Features

  8. Part I Wireless Session Protocol

  9. Wiress Session Protocol • Currently defined WSP services include only browsing services WSP/B • WSP/B is a binary equivalent of HTTP/1.1

  10. WSP Features Highlight • Supports both connection-oriented and connectionless modes • Pull: Support all HTTP/1.1 request methods (GET, PUT, POST, etc.) (confirmed and non-confirmed) • Push: Server push (confirmed, non-confirmed) • Suspend/Resume sessions independent of transport sessions

  11. Session Establishment / Termination

  12. Session Establishment (over WAP Class 2)

  13. Transaction Example

  14. Method Invocation (over WTP Class 2)

  15. Session Suspend/Resume

  16. Suspend (over WTP Class 0)

  17. Connectionless Session Service • Provides unconfirmed (no ack or retx) facilities for:Method Invocation (GET, POST) andPush

  18. Part II Wireless Application Environment (WAE)

  19. What is WAE? • Specifies an application framework for wireless devices such as mobile telephones, pagers, and PDAs. • Defines a model suitable for buliding interactive applications that function well in narrow-band environment with medium to high latencies.

  20. WAE Model

  21. Components of WAE • User Agents: in-device software that retrieves and displays content to the user. Understands WML and WML-Script • Gateways: Conversion between HTTP & WSP and/or HTML & WML • Various WAE specific formats: WML, WML-Script, WBMP(bitmap)

  22. Sample WML Page • <WML> <CARD> Choose <I>all</I> you like: <SELECT KEY=“X” ….. > <OPTION VALUE=“D”>Dog</OPTION> <OPTION VALUE=“C”>Cat</OPTION> <OPTION VALUE=“H”>Horse</OPTION> </SELECT> </CARD></WML>

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