Basics of communication with Industrial Ethernet1.6 Industrial Wireless ControlIndustrial EthernetSystem Manual, 09/2019, C79000-G8976-C242-10 671.6 Industrial Wireless Control1.6.1 Mobile wireless standards GSM, UMTS and LTEIntroductionIndustrial wireless control is the connection of widely distributed process stations to one ormore central control systems. Various wireless methods are used for the communicationrequired for monitoring and control. This makes service possible on installations without fixedtelephone lines. An Internet access is also not necessary for the installation.GSM (2G)GSM (Global System for Mobile Communication) was the first standard for the digitaltransmission of languages and short messaging services. Industrial usage is limited totelecontrol and text messaging.GPRS (2.5G)The General Packet Radio Service (GPRS) is a mobile wireless technology for packet-switched data transmission via GSM networks (Global system for mobile communications).The GSM wireless channels are divided into eight time slots. One time slot represents onetransmission channel.Packet-switched data transmission means that in contrast to line-switched data transmission(as with GSM), no transmission channel is reserved permanently. The sender divides themessage into individual packets with additional information (packet sequence, recipientaddress). With the aid of the GPRS system, the packets are forwarded through various timeslots of the network. This makes it possible to use free capacity. A GPRS session can alsouse several time slots at the same time. The recipient then puts together the packets in thecorrect order. GPRS allows data exchange without connection establishment and billing onlyaccording to the transferred amount of data. Packet switching is made possible by IPtechnology. GPRS is used mainly for access in IP-based networks, for example the Internet.EGPRS, EDGE (2.75G)The Enhanced General Packet Radio Service (EGPRS) is an expansion of GPRS and isalso known as Enhanced Data Rates for GSM Evolution (EDGE). EGPRS uses a differentmodulation technique (8-PSK) from GPRS that is more efficient. This means that a data rateup to four times higher can be achieved with EGPRS.UMTS (3G)UMTS is the acronym for Universal Mobile Telecommunications System and is also knownas a mobile wireless standard of the third generation (3G). The maximum transmission rateis 384 kbps. Video surveillance and prompt remote access to machines are relevantapplications of this technology in the industrial environment.
