Short message protocol MMS

MMS is the abbreviation of multimedia messaging service, which is also called "MMS" in Chinese. It is the latest service developed according to the standards of 3GPP and WAP forums related to multimedia information. Its biggest feature is that it supports multimedia functions. With the support of GPRS, CDMA 1X, 3G and EDGE, WAP wireless application protocol is used as the carrier to transmit video clips, pictures, sounds and characters. The transmission mode can be not only between mobile phones, but also between mobile phones and computers. The mobile phone with MMS function is unique in its built-in media editor, which enables users to write multimedia information conveniently. If the mobile phone has a built-in or external camera, users can make information or electronic postcards in PowerPoint format and send them to friends or colleagues. This application service has gradually matured and become the mainstream short message format.

MMS is the "third generation short message service" after SMS and EMS. Text messages can only be sent and received. EMS can add ringtones, simple graphics and simple animations to short messages. MMS greatly expands the types of media that can be sent and received. Text, simple pictures and ringtones can be transmitted. Complex pictures such as photos, big pictures, music clips and video clips can better play the role of MMS.

The industrial standard of MMS is formulated by WAP Forum and 3GPP (3G Partnership Project). Therefore, MMS is designed to run on the upper layer of WAP protocol, not limited to transmission format, but also supports circuit-switched data format and general packet radio service format. Its working principle is to use the high-speed transmission technology edge (enhanced data rate GSM e-transmission), which is a new technology to improve the data rate and a transition step from GSM to the third generation mobile communication system IMT-2000. It is also called GSM 384, because it can increase the data rate from 9.6kbit/s to 384kbit/s, and can support many high-speed data services such as voice, Internet browsing, e-mail, conference TV and so on. With the support of GPRS, WAP (Wireless Application Protocol) is used as the carrier to transmit videos, pictures, sounds and characters.