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digital cellular system 1800 MHz (mobile communications) (DCS 1800)

The Digital Cellular System(DCS) is a cellular mobile communications system standardized by the European Telecommunications Standards Institute( ETSI) in 1991, which was operated as the DCS-1800 network with the E-Plus license by the E-Plus consortium in Germany from 1993. The DCS-1800 network is based on the GSM specifications for a cellular, circuit-switched mobile communications system in the 1,800 MHz radio frequency range( E network) and is also the development stage for the Personal Communications Network( PCN).

DCS-1800 in contrast to GSM

The DCS standard differs from GSM essentially in that it is located in the 1800 MHz frequency range. 75 MHz each are available for uplink and downlink. The frequency ranges are 1,710 MHz to 1,785 MHz for the uplink and 1,805 MHz to 1,880 MHz for the downlink. A total of 2,976 channels can be transmitted with a channel spacing of 200 kHz. The number of channels results from the combination of the TDMA method and the FDMA method, in which 372 carrier frequencies are transmitted in 8 time slots. Eight consecutive time slots form a frame structure of 4.615 ms. Each of these frames is used as a user data channel or to transmit signaling information.

Frequency bands in the DCS

Frequency bands in the DCS

The base stations operate with a maximum power of 20 W. The cell radius for DCS 1800 is eight to ten kilometers in open countryside and a few hundred meters in large cities. The mobile stations have RF powers of 0.3 W to 2 W

The DCS network was conceptually developed for voice communications, but it also offers the option of fax and data transmission at transmission speeds of up to 9.6 kbit/s.

The structure of the DCS network

DCS data frame

DCS data frame

The structure of the DCS network corresponds to that of the GSM network with the three subsystems for the base station( BS) the subsystem for the switching functions( SSS) and the subsystem for operation and maintenance, Operation and Maintenance Center( OMC). The subsystems in turn consist of the various components. For example, the Base Station Subsystem consists of the Mobile Station( MS), the Base Station Controller( BSC), and the Base Transceiver Station( BTS). The Switching Subsystem (SSS) includes the switching components, such as the Mobile Switching Center ( MSC) and the Gateway Switching Center( GMSC), as well as the Subscriber Location Register ( HLR), the VisitorLocationRegister ( VLR), the Equipment InformationRegister( EIR), and the Authentication Center( AC).

The service features of the DCS network are similar to those of the GSM network. Worth mentioning are the various call forwarding features: automatic call forwarding, call forwarding when busy, off-hook and unavailable, personal answering machine, call barring, call management with call waiting, hold andtoggle, international roaming, long-distance copying (fax) and data transmission, short message service ( SMS) and theft protection. In addition to these service features, the Digital Cellular System (DCS) offers additional value-added services of business and traffic news as well as directory assistance and operator services.

Englisch: digital cellular system 1800 MHz (mobile communications) - DCS 1800
Updated at: 16.11.2013
#Words: 467
Links: digital cellular system (DCS), mobile communications, system, European telecommunications standards institute (ETSI), network
Translations: DE

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