Technically, the E1 network is based on the GSM standard and is therefore comparable with the D1 network and the D2 network. The transmission frequencies of the E1 network are in the 1800 MHz range. Planning is broader and it is intended to introduce the DCS 1800 standard as part of the Personal Communications Network( PCN).
In addition to cost-effective implementation, the main requirements for this standard are the achievement of high traffic densities of 500 Erlang/sq km and low transmitting powers of 250 mW to 2 W, as well as the use of the GSM half-rate code. Due to the physically determined considerably smaller range offrequencies in the 1800 MHz range compared to the 900 MHz range, the radio cell size must also be redefined.
Compared with D-networks with a range of up to 50 km, the DCS-1800 network(Digital Cellular System) limits this range to a maximum of 8 km in open, sparsely built-up areas. In densely built-up urban areas, the range then drops to less than 1 km. Since the range can be easily controlled via the transmitting power, the radio cell size can be decisively adapted to the requirements. Radio cells with a size of over 150 m are called microcells, and those under 150 m are called picocells, mainly for use in the home. The 8 km macrocells are suitable for setting up a wireless local area network in rural areas.
The E1 cellular network, also known as E-Plus, offers a wide range of telephone services, supplementary services and value-added services. The telephone services include telephony, emergency call services and short messages; the supplementary services include call forwarding and call blocking as well as call waiting; and the value-added services include personal call answering, call answering advice service, directory assistance, call forwarding, roadside assistance and short message order service.