WIRELESS APPLICATION PROTOCOL

Transcription

1 WIRELESS APPLICATION PROTOCOL Wirlss Application Protocol Nw York 50 Broad Strt Nw York, NY T: F: Nw Jrsy 100 Mtroplx Driv Edison, NJ India 20A, Barnaby Road Kilpauk, Chnnai T:(91) F:(91) London Barnaby Tchnologis 209 Spring Grov Road Islworth, Hounslow Middlsx, UK TW74AH T: (44) Wb:

2 What is WAP? Wirlss application protocol (WAP) is an application nvironmnt and a st of communication protocols for wirlss dvics dsignd to giv manufacturr, vndor, and tchnology-indpndnt accss to th Intrnt and advancd tlphony srvics. Th wirlss industry cam up with th ida of WAP. Th point of this standard was to show intrnt contnts on wirlss clints, lik mobil phons. WAP is an application communication protocol WAP is usd to accss srvics and information WAP is inhritd from Intrnt standards WAP is for handhld dvics such as mobil phons WAP is a protocol dsignd for micro browsrs WAP nabls th crating of wb applications for mobil dvics. WAP uss th mark-up languag WML (not HTML) WML is dfind as an XML 1.0 application Th Wirlss Application Protocol Th WAP protocol is th lading standard for information srvics on wirlss trminals lik digital mobil phons. Th WAP standard is basd on Intrnt standards (HTML, XML and TCP/IP). It consists of a WML languag spcification, a WMLScript spcification, and a Wirlss Tlphony Application Intrfac (WTAI) spcification. WAP is publishd by th WAP Forum, foundd in 1997 by Ericsson, Motorola, Nokia, and Unwird Plant. Forum mmbrs now rprsnt ovr 90% of th global handst markt, as wll as lading infrastructur providrs, softwar dvloprs and othr organizations. WAP Micro Browsrs To fit into a small wirlss trminal, WAP uss a Micro Browsr. A Micro Browsr is a small pic of softwar that maks minimal dmands on hardwar, mmory and CPU. It can display information writtn in a rstrictd mark-up languag calld WML.

3 Th Micro Browsr can also intrprt a rducd vrsion of JavaScript calld WMLScript. What is WML? WML stands for Wirlss Markup Languag. It is a mark-up languag inhritd from HTML, but WML is basd on XML, so it is much strictr than HTML. WML is usd to crat pags that can b displayd in a WAP browsr. Pags in WML ar calld DECKS. Dcks ar constructd as a st of CARDS. What is WMLScript? WML uss WMLScript to run simpl cod on th clint. WMLScript is a light JavaScript languag. Howvr, WML scripts ar not mbddd in th WML pags. A WML pag only contains rfrncs to script URLs. WML scripts nd to b compild into byt cod on a srvr bfor thy can run in a WAP browsr. Exampls of WAP us Architctur Chcking train tabl information Tickt purchas Flight chck in Viwing traffic information Chcking wathr conditions Looking up stock valus Looking up phon numbrs Looking up addrsss Looking up sport rsults

4 Architctur: SNMP JAVA LOGGING SUBSCRIBER DB APPLICATIONS BILLING DATA SUBSCRIBER DATA COMPILER & ENCODER CONTEXT MANAGER MANAGEMENT WSP WTP HTTP WTLS WDP/ADAPTATION TCP/IP BEARERS INTERNET FIREWALL ETC. Architctur of a WAP Gatway WDP Th WAP datagram protocol (WDP) is th transport layr that snds and rcivs mssags via any availabl barr ntwork, including SMS, USSD, CSD, CDPD, IS136 packt data, and GPRS. WTLS Wirlss transport layr scurity (WTLS), an optional scurity layr, has ncryption facilitis that provid th scur transport srvic rquird by many applications, such as -commrc.

5 WTP Th WAP transaction protocol (WTP) layr provids transaction support, adding rliability to th datagram srvic providd by WDP. WSP Th WAP sssion protocol (WSP) layr provids a lightwight sssion layr to allow fficint xchang of data btwn applications. HTTP Intrfac Th HTTP intrfac srvs to rtriv WAP contnt from th Intrnt rqustd by th mobil dvic. Conclusion: WAP can provid multipl applications, for businss and customr markts such as banking, corporat databas accss, and a mssaging intrfac.