What is WAP

WAP is a kind of wireless application protocol, which is a global open protocol. WAP defines a common platform for converting information from HTML on the Internet to a WML description of the display on a mobile phone or other handheld device. A variety of networks, that is, it does not rely on some kind of network, today's WAP services may continue to exist after the arrival of 3G, but the transfer rate is faster and protocol standards are upgraded.

WAP is the abbreviation of wireless application Protocol (i.e. Wireless Application protocol). This is a security standard for users to access information using wireless handheld devices such as PDAs, mobile phones, pagers, two-way broadcasts, smart phones, etc. WAP supports most wireless networks, including GSM, CDMA, CDPD, PDC, PHS, TDMA, FLEX, Reflex, IDen, Tetea, DECT, Datatac, and Mobitex. WAP is supported on all operating systems, including PalmOS, EPOC, Windows CE, Flexos, OS/9, and Javaos, which are designed specifically for handheld devices. Some handheld devices, such as PDAs, can be used to access the Internet via WAP after installing a mini browser. Micro-browser file is very small, can better solve the handheld device memory small and wireless network bandwidth is not wide limit. While WAP supports HTHL and XML, WML is the language specifically for small screens and keyboard-free handheld devices. WAP also supports WMLScript. This scripting language is similar to JavaScript, but requires less memory and CPU because it basically doesn't have the unwanted functionality that other scripting languages contain.

WAP (Wireless application Protocol)

is a globally unified open protocol standard that provides Internet content and advanced value-added services to mobile terminals, and is a simplified wireless Internet protocol. WAP combines internet and mobile phone technology to make it a reality to access rich Internet resources anytime, anywhere. WAP service is a kind of direct Internet, mobile phone WAP "browser" browsing WAP site services, can enjoy news browsing, stock inquiries, mail delivery, online games, chat and other applications. WAP access through GPRS network can give full play to the advantages of short access time delay (2-second access) rate, always online, easy to switch, etc.

WAP 1.2 is based on WML

WAP 2.0 is a WAP-oriented XHTML for programming and web closer

WAP (Wireless Application Protocol) is a global open standard that describes in detail how communications are transmitted, encoded and applied to wireless devices, and is supported by more than 200 companies, such as Ericsson,nokia and Motorola, who are the initiators of WAP. Relatively speaking, from the meaning of understanding, WAP may be the wireless access protocol or directly referred to as the Wireless Internet Protocol, it standardizes the Web browsing format and communication protocols, such as TCP/IP. Bluetooth is also a wireless protocol, but Bluetooth has standardized more specific hardware and frequency applications.

WAP (Wireless Communication Protocol) is an open global standard for communication between digital mobile phone, Internet or other personal digital assistant (PDA) and computer application. The birth of this standard is the result of the efforts of WAP Forum members, WAP Forum was in June 1997, by Nokia, Ericsson, Motorola and Wireless Planet (Unwired Planet) on the common composition. The goal of WAP is

Through WAP technology, the Internet can be a large number of information and a variety of business into mobile phones, palm and other wireless terminals. No matter where you are or when you need information, you can open your WAP phone and enjoy endless online information or online resources. Such as: Comprehensive news, weather forecasts, stock market dynamics, business reports, current exchange rates and so on. E-commerce, online banking will also be achieved. (Computer science)

You can also anytime and anywhere to get sports results, entertainment, anecdotes and humorous stories, add spice to life, you can also use the online booking function, the orderly arrangement of life. The WAP protocol includes the following layers: 1, Wireless application Environment (WAE) 2, Wireless session Layer (WSL) 3, Wireless Transport, Layer Securit Y (WTLS) 4, Wireless Transport Layer (WTP), the WAE layer contains features such as micro-browser, WML, WMLScript interpreter, and so on. The WTLS layer provides the basic security features for wireless e-business and wireless encrypted transmission of data.

The basic principle of WAP

AP Standard is a set of protocols

The Wdp:wap Datagram Protocol layer is the transport layer that sends and receives messages.

WTLS: Wireless transmission Security layer, is to provide security services such as E-commerce applications.

The Wtp:wap transport protocol layer provides transmission support to increase the availability of datagram services provided by WDP.

Wsp:wap session protocol layer, which provides effective data exchange between different applications.

HTTP interface: Information retrieval requests that support mobile terminals.

The development of WAP

WAP is now a global fact standard for accessing wireless information services via mobile phones or other wireless terminals. Its development and application is unlimited, can say that the only limit is your imagination, WAP not only make the existing many applications have been rapid changes, but also the emergence of more new value-added services.

For example, to support specific business processes, information delivery or domain maintenance, including customer service and spare parts delivery, message notification and call management, e-mail, value-added services based on the telephone, group planning, meteorological and traffic information, map and location services, news and sports reports; It is particularly noteworthy that It makes the information service widely used on the internet, gradually from the provision of pure information to more interactive and final e-commerce development.

The design idea of WAP

WAP provides an open, unified technology platform for users to easily access and obtain information and services on the Internet or intranet in a unified content format.

WAP defines a set of hardware and software interfaces that enable mobile devices and Web servers that allow people to use their mobile phones to send and receive e-mail or even browse the Internet, as they do with PCs. In essence, WAP is a communication protocol, it provides an application development and operating environment, support the current most popular embedded operating system PalmOS, EPOC, WindowsCE, Flexo, Javaos and so on.

WAP can support the vast majority of wireless devices currently in use, including mobile phones, Flex pagers, two-way radio communication devices, and so on. Compared to desktop PCs, these devices have weak CPU function, small memory, limited power supply under wireless environment, small display screen and restricted input function. On the transmission network, WAP can also support the current mobile network, such as GSM, CDMA, PHS and so on, it can also support the next three generations of mobile communication systems. But the bandwidth of the wireless network is always limited, compared with the bandwidth of the wired network using the Internet. Taking into account the above limitations and disadvantages, WAP fully borrowed the idea of the Internet, and make some changes and simplification. This is where applications and Web content are represented in a standard data format, using a micro-browser similar to the browser software used on a PC, and applying standard communication patterns for browsing online.

The WAP standard defines an application environment that allows designers to develop devices-independent user interfaces, and then embeds executable logic into mobile terminals using the WAP programming language of WMLScript (WML scripting). In this way, a micro-browser is actually running on a mobile terminal, much like IE or Netscape's browser used on a PC.

Technical features of WAP

In the past, wireless Internet access has been limited by mobile devices and wireless networks. WAP leverages Internet standards such as XML,UDP and IP, and many of its procedures are based on Internet standards such as HTTP and TLS, but are optimized to overcome the disadvantages of low bandwidth, high latency, and poor connection stability in the original wireless environment.

The original Internet standards, such as HTML,HTTP,TLS and TCP, are far from enough to meet the requirements of mobile networks, as large text data messages need to be transmitted. Standard HTML content is no longer possible to effectively display on pocket-sized phones and pagers on a narrow screen.

WAP uses binary transmission to compress data more, while its optimization function is suitable for longer wait time (long latency) and low bandwidth. The WAP session system can handle intermittent coverage (intermittent coverage), and can operate under various changing conditions of wireless transmission.

WML and WML script are used to make WAP content, which maximizes the use of small screen displays. The content of WAP can be displayed on the screen of two lines of the latest smart phone or other communicator, or it can be turned into a full image screen display.

Lightweight WAP protocol The design of the stack memory minimizes the required bandwidth while making the most of the wireless network types that provide WAP content. It is suitable for a variety of networks, such as the Global mobile communication system gsm900,gsm1800 and GSM1900, the Transitional Standard (IS)-136, the European format dect, the personal communication Service, the high speed paging (FLEX) and the Code Division multiple access. It also supports all network technologies and hosting services, including short message Service (SMS), unstructured ancillary business data (USSD), Circuit switched cellular mobile data (DSD), cellular mobile Digital Packet data (CDPD), and Universal Packet Radio Service (GPRS). Since WAP is based on an upgradeable tiered structure, each tier can evolve independently of other tiers. This allows the introduction of other bearer services or the use of new transmission procedures without the need for other layers of change.

WAP makes it possible for users who hold small wireless devices such as mobile phones and PDAs, such as Internet browsing, to move online to get information. WAP takes into account the limitations of those devices and considers the flexibility requirements of these users. The limitations of a handheld WAP device compared to PCs: Low-resolution small display input devices have limited capacity, and it is important not to provide fixed-point devices with low power CPUs, less memory and lower energy than the unstable network bandwidth and the flexibility of connecting to less stable WAP compared to html-c, The WAP standard does not specify what form the WAP device should be. This is extremely advantageous to equipment manufacturers, enabling them to produce a variety of different types of equipment to meet different needs. In the near future, the demand for WAP devices will be based on the size of the browser screen, input devices and memory size, so as to promote the WAP equipment in the new technology and solutions to develop progress.

By using mobile phones to connect to the Internet will soon become a standard, and WAP is the technical tool to achieve this standard. Today, the number of mobile phone internet access is growing faster than the number of PC Internet. This means that in the near future, most new mobile phones will be equipped with WAP browsers. Wireless users with WAP devices are provided with relevant services via the Internet, and the Web pages are compiled in HTML format. For many even the vast majority of users, WAP devices will become a common tool for their access to these services.