What is the GSM protocol?

The full name of GSM[ 1] is Global System for Mobile Communications, and Chinese is Global System for Mobile Communications, commonly known as "GSM". It is a technical standard of mobile communication originated in Europe, and it is the second generation of mobile communication technology. Its development purpose is to enable all parts of the world to use the same mobile phone network standard, so that users all over the world can use a mobile phone. China introduced this technical standard in the early 1990s, and has been using cellular analog mobile technology, that is, the first generation of GSM technology (China closed the analog mobile network on February 3, 20061day). At present, China Mobile and China Unicom each have a GSM network, which is the largest mobile communication network in the world. The GSM system includes GSM 900:900MHz, GSM 1800: 1800 MHz and GSM 1900: 1900 MHz. GSM (Global System for Mobile Communications) is a digital mobile phone system widely used in Europe and other parts of the world. GSM is a variant of TDMA, which is the most widely used of three digital wireless telephone technologies (TDMA, GSM and CDMA). GSM digitizes the data, compresses the data, and then sends it out of the channel together with two other user data streams, which have their own time slots. GSM is actually the wireless telephone standard in Europe. According to the report of the Joint Committee of GSM MoU, GSM has 65.438+0.2 billion users all over the world, covering more than 65.438+0.20 countries. Because many GSM network operators have roaming agreements with other foreign operators, users can still use their mobile phones when they go to other countries.

As an auxiliary department of Sprint, a famous American communication company, American Personal Communication is using GSM as a broadband personal communication service technology. This personal communication service will eventually build more than 400 base stations for mobile phones being produced by Ericsson, Motorola and Nokia. Mobile phones include telephones, SMS pagers and walkie-talkies.

GSM and other technologies are the evolution of wireless mobile communication, including high-speed circuit-switched data, general wireless packet system, data-enhanced mobile communication technology based on GSM network and general mobile communication services.