IDEN (Integrated Digital Enhanced Network)

Trunking communication system is a kind of group scheduling command communication for mobile communication system, mainly used in mobile communication field. And ordinary mobile communication, group communication is the biggest characteristic, voice communication using PTT ( PushToTalk ) button to press, namely through the way of connection, called without off-hook to answer, and the connection speed, and can support the group call function. IDEN ( Integrated Digital Enhanced Network ) is the United States of America Motorola Company Development and production of a kind of digital trunking mobile communication system, it is the most popular one of the cluster communication system.

IDEN ( Integrated Digital Enhanced Network ) is the United States of America Motorola Company Development and production of a kind of digital trunking mobile communication system, it is the predecessor of the MIRS system, the initial design is done in trunking network applications, so in addition to the dispatching business, also both duplex telephone Internet, data and short message and other functions.

In the aspect of technology, iDEN has the following characteristics: first, in terms of features, iDEN in the traditional scheduling communication foundation, has absorbed a large number of digital cellular telecommunications system advantages, enhance the function of the Internet telephone, wireless telephone function and personal mobile communication system with a level, at the same time, digital cellular telecommunications system value business such as the short message service, voice mail and IWF based on the data of the circuit applied in iDEN system; second, iDEN high efficiency use of traditional spectrum, iDEN adopted the traditional 800MHz spectrum ( 806MHz ~ 825MHz, 85lMHz ~ 870MHz ), except in Europe, the spectrum in the world are widely used in cluster communication, with no need of adjustment, iDEN can use a discontinuous frequency point, convenient for the operators to flexible allocation of frequency resources, by using the techniques of TDMA, iDEN a 25kHz physical channel is divided into 6 digital communication slot, frequency utilization rate is higher; third, iDEN adopted a unique MI6QAM modulation technology, so that each 25kHz physics channel (including 6 communication slot ) rate reaches 64Kbps, while the adjacent channel suppression reached more than 60dB, the highly efficient modulation techniques to ensure that the cluster. Letter in the process of digitalization of analog and digital systems coexist, iDEN voice encoding mode to take 4.2Kbps VSELP, available in 6 : 1 compression under the guarantee of speech quality; fourth, honeycomb cell structure to improve the network coverage, iDEN adopted 7 x 3 residential reuse mode, a base station is divided into sector area, enlarge the capacity of the cell, improve the regional networking capability, at the same time, can also take the omnidirectional base station, with a 12 x 1 the cell multiplexing way, suit one's measures to local conditions, gradually developed; fifth, can realize cross dispatching communication.

The current iDEN technology system is mainly used for digital trunking network system application, the Americas and Asia is the main market. In America, the United States, Canada, Argentina, Brazil, Columbia, Mexico, Peru and other countries have iDEN system deployment; in Asia, Japan, South Korea, China, Philippines, Singapore, Israel and other countries can be found in iDEN network. Among them, by the American Nextel company ( now with other mobile operators merged ) operation of the iDEN network is currently the largest, most perfect iDEN network.

IDEN network service object is more extensive, including government agencies and enterprises of various users, such as: construction, repair services, energy and power industry, retail and wholesale, forestry, mining industry, broadcasting and publishing.

However, because of the iDEN system by Motorola is exclusive manufacturing, interface not publicly, at present the network device is mainly composed of Motorola supply, so the system, network and terminal equipment procurement cost is relatively high. But, because the development of an earlier era, although the technology is relatively mature, but the new business support ability is relative weaker.