Basic Analysis of content related to the WAP protocol

We have already learned a lot about the WAP protocol. However, as mobile phone networks continue to grow and some commercial applications continue to develop, there are still many areas worth learning. So now let's review this knowledge point.

WAP is a Wireless Application Protocol and a global open protocol. WAP defines a universal platform and converts the current HTML language information on the Internet to the information described in WML, multiple networks are displayed on mobile phones or display screens of other handheld devices. That is to say, they do not depend on a certain network. Today's WAP Service may continue to exist after 3G, however, the transmission rate is faster, and the protocol standards will also upgrade ｡

WAP (Wireless Communication Protocol) is used on digital mobile phones, the internet, or other personal digital assistant machines (PDAs) global Open Standards for communications between computer applications and future information appliances. The birth of this standard was the result of the efforts of members of the WAP Forum. The WAP Forum was held in June 1997, composed of Nokia, Ericsson, Motorola, and Unwi redPlanet ｡

With the WAP technology, you can introduce a large amount of Internet information and various services to wireless terminals such as mobile phones and Palm. wherever and whenever you need information, you can open your WAP mobile phone and enjoy endless online information or resources ｡

WAP can run on various Wireless networks, such as GSM, GPRS, and CDMA. WML is a Wireless Makeup language) mobile phones that support WAP technology can browse Internet content described by WML ｡

WML is an XML-based markup language used in standardized narrow-frequency devices, such as mobile phones, receivers, and other languages for displaying content and user interfaces. Due to the narrow-frequency, WML is partially restricted, such as small displays, limited user input devices, narrow-frequency network connections, and limited memory and resources ｡

WML supports text and image display. In the content organization, a page is a Card, and a group of cards constitute a Deck. When a user requests a browser from the server, WML sends the entire Deck to the browser of the client, so that the user can view all the Card content in the Deck without downloading each Card from the network ｡

Through WAP Technology, a large amount of Internet information and various services can be introduced into wireless terminals such as mobile phones and PALM. Whenever and wherever information is needed, by enabling the WAP mobile phone, you can enjoy endless online information or resources ｡

For example: comprehensive news, weather forecasts, stock market dynamics, business reports, current exchange rates, etc. E-commerce and online banking will also be implemented one by one. Through WAP mobile phone users can also obtain Sports Competition Results anytime, anywhere, and interesting news in the entertainment circle., you can also use the online booking function to arrange your life in an orderly manner ｡

The protocol stack of WAP communication protocol adopts a hierarchical design. it provides a scalable and scalable environment for application system development. Each layer of the protocol stack is defined as t-J, which can be used by the previous layer of protocols, it can also be directly applied by other services or applications. In the design, WAP fully draws on the Internet protocol stack idea and modifies and simplifies it, it is effectively used in wireless application environments. The WAP protocol stack consists of the following five layers:

The WAP protocol stack is divided into the following layers:

(1) Application Layer: Wireless Application Environment WAE (Wireless Application Environment) is a general Application Environment based on WWW and mobile phone technology, the basic purpose is to build an environment that can be operated together, so that operators and service providers can create applications and services suitable for different wireless platforms ｡

(2) Wireless Session Layer. The Wireless Session Layer Protocol WSP (Wireless Session Protocol) provides the WAP application layer with consistent interfaces to the two conversation services. The connection-oriented service operated on the WTP layer is one of the two, the second is the non-Connection Service WDP operated on the secure or non-secure data packet service. The Wireless Session Protocol is currently composed of services that match the browsing application, which is generally abbreviated as WSP/B.

(3) transmission Protocol layer. The Wireless Transport Protocol Layer WTP (Wireless Transaction Protocol) runs at the top of the data packet service, it also provides common transaction services suitable for "thin" customers, that is, running on mobile websites, and can optimize mobile terminals,

(4) Security protocol Layer. Wireless Transport Security Layer Protocol (WTLS) is a protocol based on industrial standard Transport Layer Security protocol, it optimizes the low-bandwidth communication channels used for WAP Transmission Based on the secure transmission protocol SSL,

(5) Datagram Protocol layer. The Wireless Datagram Protocol WDP is used to transmit data, send and receive messages. It can provide service support to the upper-layer Protocol of WAP, it also ensures the transparency of communication and can independently run the lower wireless network. When the transmission interface and basic features are consistent, WDP can use the intermediate gateway to achieve global work interoperability, to achieve smooth wireless data transmission ｡