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Forum WAP协议技术分类
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  • 协议
  • wap
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WAP协议技术分类

sailmoon
sailmoon over 15 years ago

在移动数字通信方面,想要进行互联网的连接,和常规的网络连接协议是有很大差别的。在这里我们来认识一下WAP协议。这个支持移动通信来进行网络互连的协议。WAP(无线通讯协议)是在数字移动电话?互联网或其他个人数字助理机(PDA)?计算机应用乃至未来的信息家电之间进行通讯的全球性开放标准?这一标准的诞生是WAP论坛成员努力的结果,WAP论坛是在1997年6月,由诺基亚?爱立信? 摩托罗拉和无线星球(Unwi redPlanet)共同组成的?

 

通过WAP协议技术,就可以将Internet 的大量信息及各种各样的业务引入到移动电话?PALM等无线终端之中?无论你在何地?何时只要你需要信息,你就可以打开你的WAP手机,享受无穷无尽的网上信息或者网上资源?

 

WAP协议技术包括以下几种:

 

1 WirelessApplicationEnvironment(WAE)

 

2 WirelessSessionLayer(WSL)

 

3 WirelessTransactionLayer(WTP)

 

4 WirelessTransportLayerSecurity(WTLS)

 

5 WirelessTransportLayer(WDP)

 

其中,WAE层含有微型浏览器?WML?WMLSCRIPT的解释器等等功能?WTLS 层为无线电子商务及无线加密传输数据时提供安全方面的基本功能?

 

WAP论坛一个很重要的指导思想是让WAP尽可能多的与现有的标准一致,以最大限度地保护制造商和应用开发者的投资?

 

在很大程度上利用了现有的WWW编程模型,应用开发人员可以继续使用自己熟悉的编程模型?能够利用现有的工具(如Web 服务器?XML工具)等?

 

另外,WAP 编程模型还针对无线环境的通信特点, 对原有的 WWW编程模型进行了优化和扩展?

 

在带宽考虑方面,WAP用“轻量级协议栈"优化现在的协议层对话, 将无线手机接入Internet的带宽需求降到最低,保证了现有无线网络能够符合WAP规范? 手机通过使用WAP协议栈可以为无线网络节省大量的无线带宽。

 

例如, 完成一个股票指数的查询操作,如果通过使用HTTP1.0的台式机浏览器来完成要比通过一个WAP浏览器来完成所涉及的包通信量要大一倍以上? WAP协议技术使用的包数量不到标准的 HTTP /TCP/IP协议栈使用的一半?

 

目前,WAP在很多方面还不够成熟,但是已经足够打开一个新的通讯领域, 为无线网络提供了足够的技术标准基础,让互联网能够真正无所不在。

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