Wireless Application Protocol WAP Dr Alison Griffiths C203 Ext:3292 www.fcet.staffs.ac.uk/alg1/ Credit to: Justin Champion.

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Presentation transcript:

Wireless Application Protocol WAP Dr Alison Griffiths C203 Ext: Credit to: Justin Champion

Mobile Internet Originally perceived as one of the primary motivators for wireless data applications Hyped as “Internet Anywhere” Result was WAP Specified by handset manufacturers & leading industry providers (WAP Forum now called Open Mobile Alliance) Version 1 – 1998 Not a success so far

Wired Internet HTTP at its simplest Designed without concern for bandwidth, persistence or delay Assumes TCP over IP Utilises DNS for logical to physical mapping Sophisticated Caching Posting assumes connection available

Wired Internet Application Layer HTML allows  Rich content  Dynamic content  Plug-ins  Extensible Ignores heterogeneity of end-user systems  Display sizes, resolutions  User Interfaces  Performance  Audio support  STORAGE

Wireless Internet Almost antithesis of wired  Bandwidth, persistence, delay are major problems  TCP extremely inefficient over-the-air  Caching cannot be guaranteed on client devices  Device profiles extremely varied Displays Browsers Plug-ins  Operating systems may be fixed at point of manufacture  Device storage very limited  Low processing power Need for new wireless-oriented protocol

WAP Myth WAP IS NOT…

WAP as a Protocol (1.0)

Wireless Application Environment (WAE) ClientGatewayOrigin servers WTA user agent WML user agent Other WAE user agents Encoders & Decoders Encoded Request Content Servers Web Server Request Response with content Encoded response with content Push contentEncoded Push content

WAP Stack Example

WAP 2.0 July 2001 Retains WAP 1.x Aspects of i-mode Full IP support TCP wireless profile TLS HTTP wireless profile 2 nd generation browsers (WML, XHTMLMP) Composite Capabilities/Preference Profiles framework (CC/PP)  For identifying device capabilities & user preferences

WAP Stack Example Protocol Framework Bearer Transport Transfer Session IPv6 IPv4 SMS CSD FLEX GPRS MPAK USSD… Datagrams (WDP, UDP) Connections (TCP wireless profile) Hypermedia Transfer (WTP+WSP, HTTP) StreamingMMS Push OTA Capability Negotiation Synchronization Cookies Application Framework WAE/WTA User Agent (WML, XHTMLMP) Multi-media Messaging ( ) Push Content formats Service Discovery Service Discovery Crypto Libraries Authentication Identification PKI Secure Transport Secure Bearer EFI Provisioning Navigation Discovery Service Lookup

Review Overview of WAP

Questions?