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Wireless Application Protocol (WAP)

Wireless Application Protocol (WAP). Network Computing Lab 김형민 (meruru98@nate.com). Why Choose WAP. Wireless handheld devices Restricted user interface (small displays and keypads) Less powerful CPU Reduced memory capacity Wireless Network Limited bandwidth Longer latency

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Wireless Application Protocol (WAP)

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  1. Wireless Application Protocol (WAP) Network Computing Lab 김형민 (meruru98@nate.com)

  2. Why Choose WAP • Wireless handheld devices • Restricted user interface (small displays and keypads) • Less powerful CPU • Reduced memory capacity • Wireless Network • Limited bandwidth • Longer latency • Lower degree of reliability Network Computing Lab

  3. The WAP Model Network Computing Lab

  4. The WAP Model Network Computing Lab

  5. WAP Gateway • The WAP Gateway utilizes Web proxy technology to provide efficient wireless access to the Internet • Implementation of WAP protocol stack layers • Access Control • Protocol conversion: WSP <-> HTTP • Domain Name resolution • HTML to WML conversion • Encording of WML content • WMLScript compilation • Security • Provide caching for frequently accessed content Network Computing Lab

  6. WAP Protocol Stack Network Computing Lab

  7. WAP Protocols • WDP (Wireless Datagram Protocol) • End-To-End 전송을 위해 port 어드레싱을 제공 • 인터넷의 UDP와 같은 전송 기능을 담당 • WTLS (Wireless Transport Layer Security) • 인터넷의 TLS (Transport Layer Security)를 근간으로 작성된 보안 프로토콜 • 인증(Authentication), 부인봉쇄(Non-Repudiation), 무결성(Constraint), 기밀성(Security) 등의 보안 서비스를 제공 • WTP (Wireless Transaction Protocol) • 트랜잭션 형태의 데이터 전송 기능을 제공 • 신뢰성 및 비신뢰성 전송 기능을 제공하고 오류복구를 위해 재전송 기능도 담당 Network Computing Lab

  8. WAP Protocols • WSP (Wireless Session Protocol) • HTTP/1.1에 상응하는 기능을 정의 • 장시간 활용의 세션을 정의하고, 세션 관리를 위해 suspend/resume 기능도 제공 • 프로토콜 기능에 대한 협상도 가능하게 함 • WAE(Wireless Application Environment) • 일반적, 다목적 응용을 개발하기 위한 응용 환경에 대한 규격을 정의 • WML(Wireless Markup Language), WMLScript 등을 정의하여 휴대 단말기에 적용될 수 있는 소규모 브라우저를 개발할 수 있도록 함 Network Computing Lab

  9. WAP 1.2 & 2.0 Network Computing Lab

  10. WAP UAProf and Caching • WAP proxy may provide a variety of functions • Protocol Gateway • The protocol gateway translates requests from a wireless protocol stack to the WWW protocols • The gateway also performs DNS lookups of the servers named by the client in the request URLs • Content Encoders and Decoders • The content encoders can be used to translate WAP content into a compact format that allows for better utilisation of the underlying link due to its reduced size • User Agent Profile Management • User agent profiles describing client capabilities and personal preferences [UAProf] are composed and presented to the applications • Caching Proxy • A caching proxy can improve perceived performance and network utilisation by maintaining a cache of frequently accessed resources Network Computing Lab

  11. Wireless Bearers for WAP • The WAP protocol stack is built on top of wireless bearer services • IP-based bearer • GPRS • UDP • Non-IP-based bearer • GSM SMS • GSM USSD • ReFlex • IS-637SMS Network Computing Lab

  12. WAP SDK Simulator Network Computing Lab

  13. Mobile Station Application Execution Environment • 단말기 응용 프로그램 실행환경 • 서비스 능력을 협상하여 MS에서 표준화된 실행환경을 제공 • MExE classmark 1 • WAP environment • MExE classmark 2 • Personal Java environment • Future classmark • Java-packages • APIs • 음성인식 • On-line (de)compression을 가진 video-I/O • 초고속 로컬 통신 Network Computing Lab

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