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A mobile phone is not a personal computer The CPU is a joke, substantially less powerful than that of a PC and has a laughable amount of memory (typically 48K) The power consumption factor is always a problem, and the limited availability of power is a major factor when dealing with these devices However, the most important limitation is that the mobile does not have a keyboard or mouse, and the display typically averages 4 lines of text The WAP standard tries to deal with these limitations As an example it is possible to translate every plain text header of HTTP into binary code which decreases the amount of data to send, allowing sessions to be resumed and suspended very easily, without any overhead Of course, this is just a sample of the things that are done to handle the situation under the existing constraints In trying to leverage as much as possible from the Internet, WAP has an equivalent structure The following figure shows a comparison of the Internet and WAP architectures, in other words, the IP Stack and the WAP Stack
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As you can see, the figure is arranged as a hierarchical system; on the lowest level are the bearers, defined as the different transmission standards available for mobile telephony You may have heard a few of these names, CDMA, CSD, GMS, SMS, etc They are the equivalent to the wire in a normal telephone line On top of that there is the Wireless Datagram Protocol (WDP) This is the Transport Layer of the WAP Stack, equivalent to User Datagram Protocol (UDP), a fast but unreliable protocol needed to deliver data between any two applications in the world Security is taken care of by the Wireless Transport Layer Security, This works in much the same way TLS (Transport Layer Security) and SSL (Secure Socket Layer) do for the Internet world Then there is Wireless Transaction Protocol, roughly equivalent to Transmission Control Protocol (TCP), which is a slower, but more reliable protocol than UDP but carries out a similar (unction Finally Wireless Session Protocol is the network protocol that performs the equivalent functionality to HTTP (Hypertext Transport Protocol)
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To develop a WAP application that can take advantage of your existing J2EE based system, you use the Wireless Application Environment (WAE), which includes: Q Q Wireless Mark-up Language (WML) WMLS, which is a scripting language derived from ECMAScripl
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In order to become familiar with WAP, all you need to know is WML, which is essentially the wireless equivalent of HTML WML is an XML based language that is specifically designed to interface with the micro-browsers that exist in the WAP enabled devices Before we go into the detail of WML, let us understand how all this integrates with an existing WebLogic server-based application In the figure below you can see how simple it is All you need is for your servlets and JSP pages to generate WML This is what is sent to the WAP Gateway, which encodes the information and converts it to Binary WML (which optimizes WML for transmission based on tokens) and sends it over the air
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There is also the possibility of generating HTML and then translating it to WML The problem with this is that many people think that translating HTML to WML wilt also take care of the presentation issues The translators do not take care of this, so it is generally not recommended to directly translate an HTML page designed for web browsers into WML as the results will usually look rather odd on a 4 line screen
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Currently in Europe there are two radically different positions that have been taken by the mobile operators On one side of the equation there are what are called the closed operators The WAP gateway, the portal, and all the content is their property and they have full control of it If you are a third party trying to place content you will have to reach an agreement with the operator in order to be able to either link or publish in their portal The way these operators enforce this despotic position is by selling WAP phone kits that have the URL and IP numbers of their portal burned in the phone, thus eliminating the possibility of the user going to another gateway or portal This is equivalent to buying a PC that can only communicate with one ISP and there is no chance of changing this, so watch out when buying a WAP phone The open operator, on the other hand, offers a gateway that allows the user to connect to the Internet acting as an ISP for your WAP phone In most cases these operators also have a portal It is also possible for the role of the mobile operator to be reduced to handling the data call, if a company has its own WAP gateway, which can be connected to the Internet or have its very own bank of modems In this case the WAP user can access the gateway via an ISP or by calling direcdy the bank of modems This architecture is depicted in the next figure This is becoming attractive as there are some mobile operators that offer a cheaper rate for data calls, in some cases as little as only 25% of the cost of a voice call
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Nokia has been marketing its WAP Server product as a corporate WAP gateway This is an option that many companies are using to implement WAP solutions For example, imagine an electric company, where the electricity meter reader enters the information using a WAP phone The WAP phone runs an application that collects the meter readings This is more efficient than writing readings down and later having to digitize and process them This particular example could work as follows: Q Q a The meter reader calls the modem bank of the electric company with a WAP phone, establishes a connection and executes the URL of the application that will handle this data The meter reader introduces the meter number and the application verifies that the meter exists and returns the address where it is installed to confirm the location, Now die actual number presented by the meter is entered through the WAP phone The application performs some basic verifications, like making sure the number is greater than for the last reading, etc
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When this cycle is completed the person moves on to the next electricity meter and restarts the process As you can see there are orders of magnitude to be gained in such a simple process that currently is done by hand
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