introduction and overview wap architecture ©1999 wireless application protocol forum, ltd. web...

Introduction and Overview

WAP Architecture WAP Architecture

©1999 Wireless Application Protocol Forum, Ltd.

Web Server

Content

CGIScripts

etc.

WM

L D

ecks

wit

h W

ML

-Scr

ipt

WAP Gateway

WML Encoder

WMLScriptCompiler

Protocol Adapters

Client

WML

WML-Script

WTAI

Etc.

HTTPWSP/WTP

The WAP Architecture


Internet

Comparison between Internet and WAP Technologies

HTMLJavaScript

HTTP

TLS - SSL

TCP/IPUDP/IP

Wireless Application Protocol

Wireless ApplicationEnvironment (WAE)

Session Layer (WSP)

Security Layer (WTLS)

Transport Layer (WDP)

Other Services andApplications

Transaction Layer (WTP)

SMS USSD CSD IS-136 CDMA CDPD PDC-P Etc..

Bearers:


WAP specifies…

Wireless Application Environment WML Microbrowser WMLScript Virtual Machine WMLScript Standard Library Wireless Telephony Application Interface WAP Content Types

Wireless Protocols Wireless Session Protocol (WSP) Wireless Transport Layer Security (WTLS) Wireless Transaction Protocol (WTP) Wireless Datagram Protocol (WDP) Wireless network interface definitions


WHY WAP ?

WAP utilizes standard Internet markup language technology (XML)

The WML UI components map well onto existing mobile phone user interfaces no re-education of the end-users

leveraging market penetration of mobile devices

WAP utilizes plain Web HTTP 1.1 servers leveraging existing development methodologies

CGI, ASP, JAVA, etc.


Why is HTTP/HTML not enough?

Big pipe - small pipe syndrome

Wireless network<HTML><HEAD><TITLE>NNN Interactive</TITLE><META HTTP-EQUIV="Refresh" CONTENT="1800, URL=/index.html"></HEAD><BODY BGCOLOR="#FFFFFF" BACKGROUND="/images/9607/bgbar5.gif" LINK="#0A3990" ALINK="#FF0000" VLINK="#FF0000" TEXT="000000" ONLOAD="if(parent.frames.length!=0)top.location='http://nnn.com';"> <A NAME="#top"></A><TABLE WIDTH=599 BORDER="0"><TR ALIGN=LEFT><TD WIDTH=117 VALIGN=TOP ALIGN=LEFT>

<HTML><HEAD><TITLE>NNN Interactive</TITLE><META HTTP-EQUIV="Refresh" CONTENT="1800, URL=/index.html">

Internet<WML><CARD><DO TYPE="ACCEPT"><GO URL="/submit?Name=$N"/></DO>Enter name:<INPUT TYPE="TEXT" KEY="N"/></CARD></WML>

010011010011110110010011011011011101010010011010

Content encoding

HTTP/HTML WAP


WHY WAP ?

Good relationships with standards

WAP compliance profile for GSM.

WAP is actively working with the W3C and IETF HTML-NG (HTML Next Generation)

HTTP-NG (HTML Next Generation)

WAP Application Environment WAP Application Environment

WML and WMLScript

Wireless Telephony Architecture

Content Formats


WAE Goals

Network-neutral application environment;

For narrowband wireless devices;

With an Internet/WWW programming model;

And a high degree of interoperability.


WAE Requirements

Internet standard technology

Device Independent

Network Independent

International Support


Requirements (cont.)

Initial focus on phones Slow bearers

Small memory

Limited CPU

Small screen

Limited input model


WAE First Generation

Architecture Application model

Browser, Gateway, Content Server

WML Display language

WMLScript Scripting language

WTA Telephony services API and architecture

Content Formats Data exchange


WML Second Generation

Extensions and enhancements Currently under development

Performance Enhancements Caching, etc.


GatewayClientNetwork

Application

WSP/HTTP Request {URL}

WSP/HTTP Reply {Content}

WAE Abstract Network Architecture


Web Server

Content

CGIScripts

etc.

WM

L D

ecks

wit

h W

ML

-Scr

ipt

WAP Gateway

WML Encoder

WMLScriptCompiler

Protocol Adapters

Client

WML

WML-Script

WTAI

Etc.

HTTPWSP/WTP

Network Example #1: WAP Gateway


WAP Application Server

Content

ApplicationLogic

WM

L D

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wit

h W

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ipt

WML Encoder

WMLScriptCompiler

Protocol Adapters

Client

WML

WML-Script

WTAI

Etc.

WSP/WTP

Network Example #2:WAP Application Server


WML

Tag-based browsing language: Screen management (text, images)

Data input (text, selection lists, etc.)

Hyperlinks & navigation support

W3C XML-based language

Inherits technology from HDML and HTML


WML (cont.)

Card metaphor User interactions are split into cards

Navigation occurs between cards

Explicit inter-card navigation model Hyperlinks

UI Event handling

History

State management and variables Reduce network traffic

Results in better caching


Handling User Input

Select lists Choose from a list of options

Input fields Enter a string of text or numbers

KEY variables Set by SELECT and INPUT elements

How user input is passed to other cards and the application server


<CARD> <DO TYPE="ACCEPT" LABEL="View"> <GO URL="getcity.cgi?location=$city"/> </DO> Forecast <SELECT KEY="city"> <OPTION VALUE="ber">Berlin</OPTION> <OPTION VALUE="rom">Rome</OPTION> <OPTION TITLE="Find" ONCLICK="find.cgi">New City</OPTION> </SELECT></CARD>

Forecast1 Berlin2 Rome3>New City____________Find

The SELECT Element

Display a list of options Each option may set the KEY variable

and/or bind a task to the ACCEPT key

TITLE= dynamically sets the label string


Other SELECT Attributes

MULTIPLE="TRUE" Allows user to pick multiple items

UP.Browser reserves soft key for item-picker

Key value is a semicolon-separated list

DEFAULT=key_value Default KEY value, if one is not chosen

Sets cursor to the default choice entry, if a corresponding OPTION / VALUE exists


A Long Select List

<CARD> <DO TYPE="ACCEPT"> <GO URL="get_addr.cgi?id=$recid"/> </DO> Addr [1..9] <SELECT KEY="recid" MULTIPLE="TRUE" DEFAULT="1;3;5"> <OPTION VALUE="1">Neil</OPTION> <OPTION VALUE="2">Kurt</OPTION> <OPTION VALUE="3">Jim</OPTION> <OPTION VALUE="4">Natasha</OPTION> <OPTION VALUE="5">Liz</OPTION> <OPTION VALUE="6">Aneesh</OPTION> <OPTION VALUE="7">Jennifer</OPTION> <OPTION VALUE="8">Jesse</OPTION> <OPTION VALUE="9">Dawnell</OPTION> <OPTION ONCLICK="#card2">More...</OPTION> </SELECT></CARD>


<CARD> <DO TYPE="ACCEPT"> <GO URL="?get=person" METHOD="POST" POSTDATA="userid=$ssn"/> </DO> Soc Security: <INPUT KEY="ssn" FORMAT="NNN\-NN\-NNNN"/></CARD>

Soc. Security:

287-33- _____________ NUM

Soc. Security:

287-33- 7629____________OK

The INPUT Element

Prompts user to enter a string of text Use FORMAT= to constrain input

UP.Browser reserves soft key fortext entry mode, if necessary


Other INPUT Attributes

DEFAULT=key_value

Default KEY variable (displayed to user)

FORMAT=format_specifier

If omitted, free-form entry is allowed

EMPTYOK="TRUE"

Browser will accept null input, even with format

TYPE="PASSWORD"

Special entry mode handled by the browser

MAXLENGTH=number

Maximum number of allowed characters


FORMAT Control Characters

N Numeric character

A, a Alphabetic character

X, x Numeric or alphabetic character

M, m Any character

Leading backslash specifies forced characters Forced characters included in KEY variable value

Leading * specifies 0 or more characters Password: FORMAT=“mmmm*m”

Leading number specifies 0..N characters Zipcode: FORMAT=“NNNNN\-4N”


<CARD> <DO TYPE="ACCEPT"> <GO URL="#c2"/> </DO> Continue <IMG LOCALSRC="righthand" ALT="forward..."/></CARD>

<CARD NAME="c2"> <IMG SRC="../images/logo.bmp" ALT="Unwired Planet"/> <BR/>Welcome!</CARD>

Displaying Images

Insert app images or local icons within display text 1-bit BMP format

Images are ignored by non-bitmapped devices Check HTTP_ACCEPT for “image/bmp”


Special WML Characters

Use character entities in display text" "& &' '< <> > Blank space Soft hyphen (discretionary line break)

Replace the “&” character in URL strings URL="query.cgi?first=$fname&last=$lname"

Use “$$” to display a single “$” character


Doing more with WML

Setting card styles to create forms

Using variables to cache user data

Using card intrinsic events to trigger

transparent tasks

Using timers

Securing WML decks

Bookmarking decks


WMLScript

Scripting language: Procedural logic, loops, conditionals, etc.

Optimized for small-memory, small-cpu devices

Derived from JavaScript™

Integrated with WML Powerful extension mechanism

Reduces overall network traffic


WMLScript (cont.)

Bytecode-based virtual machine Stack-oriented design

ROM-able

Designed for simple, low-impact implementation

Compiler in network Better network bandwidth use

Better use of terminal memory/cpu.


WMLScript Standard Libraries

Lang - VM constants, general-purpose math functionality, etc.

String - string processing functions

URL - URL processing

Browser - WML browser interface

Dialog - simple user interface

Float - floating point functions


WMLScript Example Uses

Reduce network round-trips and enhance functionality.

Field validation Check for formatting, input ranges, etc.

Device extensions Access device or vendor-specific API

Conditional logic Download intelligence into the device


Functions

WMLScript Example

WMLScript is very similar to JavaScript

ProgrammingConstructs

Variables

function currencyConvertor(currency, exchRate) { return currency*exchangeRate; }

function myDay(sunShines) { var myDay; if (sunShines) { myDay = “Good”; } else { myDay = “Not so good”; }; return myDay;}


Content Format Example

Image Element

<WML><CARD> Hello World!<BR/> <IMG SRC=“/world.wbmp” ALT=“[Globe]” /></CARD></WML>

Example Use of an Image:


Push

Push is under development

Network-push of content Alerts or service indications

Pre-caching of data

Goals: Extensibility and simplicity

Security

User friendly


WAE Technical Collaboration

W3C Technical collaboration

CC/PP

HTML-NG

HTTP-NG

Etc.


Summary: WAE Status

First generation released Implementations are in progress

Specifications include: WAE, WML, WMLScript

WBMP, WTA, WTAI, etc.

Second generation in development Focusing on:

Push, Interoperability, UAProf

Telephony, Internationalization, etc.


Wireless Transaction Service Access Point

Wireless Datagram Protocol

BearerService

D

BearerService

CBearerService

B

Transport Service Access Point (TSAP)

BearerService

A

Physical Layer Air Link Technology

Wireless Transaction Protocol

Wireless Session Protocol

Wireless Session Service Access Point

WCMP

WAP Protocol Layers


Capabilities

Capabilities are defined for: Message Size, client and server

Protocol Options: Confirmed Push Facility, Push Facility, Session Suspend Facility, Acknowledgement headers

Maximum Outstanding Requests

Extended Methods

Header Code Pages


Suspend and Resume

Server knows when client can accept a push

Multi-bearer devices

Dynamic addressing

Allows the release of underlying bearer resources


Connection And Connectionless Modes

Connection-mode Long-lived communication

Benefits of the session state

Reliability

Connectionless Stateless applications

No session creation overhead

No reliability overhead

introduction and overview wap architecture ©1999 wireless application protocol forum, ltd. web...

Documents

generation slide

wml decks

existing internet technologies

internet comparison

plain web http

requirements lnot

generation lhttpng html

web server content cgi