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enhanced circuit switched data (ECSD)

Enhanced Circuit Switched Data (ECSD) is a variant of High Speed Circuit Switched Data(HSCSD) used in conjunction with Enhanced Data Service for GSM Evolution( EDGE) to increase the user data rate in GSM networks.

In ECSD, the data rate is increased by bundling multiple transmission channels and the lack of error correction. ECSD recognizes five different data rates with data rates between 9.6 kbit/s and 43.2 kbit/s. Since ECSD already starts with modulation, it uses Gaussian Minimum Shift Keying ( GMSK) modulation for the normal traffic channels with 9.6 kbit/s and 14.4 kbit/s, and 8PSK phase shift keying for the enhanced channels with 28.8kbit/s, 32.0 kbit/s and 43.2 kbit/s, in which 3-bit words are transmitted with each carrier phase change. In addition, ECSD uses a data rate adaptation algorithm that adjusts the data rate depending on the quality of the radio transmission link.

If all eight time slots are used, a maximum data rate of 345.6 kbit/s can be achieved.

Informations:
Englisch: enhanced circuit switched data - ECSD
Updated at: 20.01.2012
#Words: 160
Links: high speed circuit switched data (mobile communications) (HSCSD), conjunction, global system for mobile communications (GSM), enhanced data service for GSM evolution (EDGE), user
Translations: DE
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