Wireless Application Protocol Intro (Continued)

1
Wireless Application Protocol Intro (Continued)

• WebTP Meeting
• H. Wilson So28 Feb, 2000.

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Outline

• Recap What is Wireless Application Protocol?
  Architecture Overview
• Wireless Session Protocol
• Wireless Application Environment architecture
  (WML WML-Script)

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Recap

• from last week

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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.

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WAP vs. IP world

• 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

Rationale reuse as much as possible from IP
world, but optimize for the wireless world (i.e.
compression, adapt to high-loss rate.)
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WAP Protocol Architecture
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Protocol Features
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Part I

• Wireless Session Protocol

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Wiress Session Protocol

• Currently defined WSP services include only
  browsing services WSP/B
• WSP/B is a binary equivalent of HTTP/1.1

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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

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Session Establishment / Termination
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Session Establishment (over WAP Class 2)
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Transaction Example
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Method Invocation (over WTP Class 2)
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Session Suspend/Resume
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Suspend (over WTP Class 0)
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Connectionless Session Service

• Provides unconfirmed (no ack or retx) facilities
  forMethod Invocation (GET, POST) andPush

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Part II

• Wireless Application Environment (WAE)

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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.

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WAE Model
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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)

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Sample WML Page

• ltWMLgt ltCARDgt Choose ltIgtalllt/Igt you like
  ltSELECT KEYX .. gt
  ltOPTION VALUEDgtDoglt/OPTIONgt
  ltOPTION VALUECgtCatlt/OPTIONgt
  ltOPTION VALUEHgtHorselt/OPTIONgt
  lt/SELECTgt lt/CARDgtlt/WMLgt