Synchronous CDMA

""Synchronous CDMA"" Synchronous CDMA (SCDMA) is one of the air interfaces of CDMA standards, it used the technology of TDMA to achieve the synchronization of the terminal's upload timeslot. SCDMA is the base of the UMTS-TDD LCR (Known as TDS-CDMA), and powerfully supported by the Chinese government. It's similar with the TDSCDMA of the special technology used, such as software radio and smart antenna. It belongs to the 2G (Second Generation Communication System).

References

Cellular network standards

List of mobile phone generations

0G (radio telephones)

AMPS family	AMPS (TIA/EIA/IS-3, ANSI/TIA/EIA-553) N-AMPS (TIA/EIA/IS-91) TACS ETACS

Other	NMT C-450 Hicap Mobitex DataTAC

GSM/3GPP family	GSM CSD

3GPP2 family	cdmaOne (TIA/EIA/IS-95 and ANSI-J-STD 008)

AMPS family	D-AMPS (IS-54 and IS-136)

Other	CDPD iDEN PDC PHS

2G transitional
(2.5G, 2.75G)

GSM/3GPP family	HSCSD GPRS EDGE/EGPRS (UWC-136)

3GPP2 family	CDMA2000 1X (TIA/EIA/IS-2000) 1X Advanced

Other	WiDEN

3G (IMT-2000)

3GPP family	UMTS UTRA-FDD / W-CDMA UTRA-TDD LCR / TD-SCDMA UTRA-TDD HCR / TD-CDMA

3GPP2 family	CDMA2000 1xEV-DO Release 0 (TIA/IS-856)

3G transitional
(3.5G, 3.75G, 3.9G)

3GPP family	HSPA HSDPA HSUPA HSPA+ LTE (E-UTRA)

3GPP2 family	CDMA2000 1xEV-DO Revision A (TIA/EIA/IS-856-A) EV-DO Revision B (TIA/EIA/IS-856-B) DO Advanced

IEEE family	Mobile WiMAX IEEE 802.16e Flash-OFDM iBurst IEEE 802.20

4G
(IMT Advanced)

3GPP family	LTE Advanced (E-UTRA)

IEEE family	WiMAX (IEEE 802.16m)

conceptual (currently under formal research & development)

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