彩信以及彩信收发的基本原理(国外英文资料).doc

彩信以及彩信收发的基本原理(国外英文资料) The basic principle of color letters and the sending and receiving of color letters Basic concepts: in the traditional sense, mobile phones are used for basic language communication and simple text interaction. And MMS is used to implement a color video transmission, its biggest characteristic is to support multimedia capabilities, able to transfer text, images, voice, data and other information of various kinds of multimedia formats. In fact, MMS doesnt have anything to do with a short message, it is under the support of GPRS network, on the carrier of wireless application protocol WAP, transfer text, pictures, sounds, animation and other information services. You can also use the original CSD method, but its slow. The color letter is usually composed of the head of color (synoptic) and multiple video images, which can contain pictures/text/sound. The color letter can actually be interpreted as an E-mail with many attachments, a normalized E-mail. Accessories include images/text/sound, are named according to certain rules, after MMS mobile phone received this E-mail in the future, can restore a video in the attachment. The email address of the fa and the receiver is 8613xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx@mmsc-b_ [/ email], for example, in the case of the users in the Beijing movement area, the previous xx section represents your phone number. 2, MMS system Network elements in general, MMS system includes the following: MMS terminal (MMSTerminal), multimedia messaging business center (MMSC), MMS user database (MMSUserDatabase), external application server (ExternalServer), value-added application server (MMS # 118 alueaddedserviceapplication) and MMS application support system. Its more complicated than text messaging, and its a WAP business, so charging fees are much higher than text messages. There is no need to care about the MMS service system. The key is how to use it. 3, MMS transceiver principle In accepting the MMS, first received a