also List of UMTS networks 3GPP: the body that manages the UMTS standard. 3GPP Long Term Evolution, the 3GPP project to evolve UMTS towards 4G capabilities. GAN/UMA: A standard for running GSM and UMTS over wireless LANs. Opportunity-Driven Multiple Access, ODMA: a UMTS TDD mode communications relaying protocol HSDPA, HSUPA: updates to the W-CDMA air interface. PDCP Subscriber Identity Module UMTS-TDD: a variant of UMTS largely used to provide wireless Internet service. UMTS frequency bands UMTS channels W-CDMA: the primary air interface standard used by UMTS. TD-SCDMA Other, non-UMTS, 3G and 4G standards CDMA2000: evolved from cdmaOne (also known as IS-95 or "CDMA"), managed by the 3GPP2 FOMA WiMAX GSM GPRS EDGE ETSI Other information Cellular frequencies CDMA Comparison of wireless data standards DECT Dynamic TDMA Evolution-Data Optimized/CDMA2000 FOMA GSM/EDGE HSPA PN sequences Spectral efficiency comparison table UMTS frequency bands WiMAX Telecommunications industry in China Communications in China Standardization in China Mobile modem Spectral efficiency comparison table Code-Division Multiple Access (CDMA) Common pilot channel or CPICH, a simple synchronisation channel in WCDMA. Multiple-input multiple-output (MIMO) is the major issue of multiple antenna research. Wi-Fi: a local area wireless technology that is complementary to UMTS. List of device bandwidths Operations and Maintenance Centre Radio Network Controller UMTS security Huawei SingleRAN: a RAN technology allowing migration from GSM to UMTS or simultaneous use of both References Citations Bibliography Martin Sauter: Communication Systems for the Mobile Information Society, John Wiley, September 2006, . Ahonen and Barrett (editors), Services for UMTS (Wiley, 2002) first book on the services for 3G, . Holma and Toskala (editors), WCDMA for UMTS, (Wiley, 2000) first book dedicated to 3G technology, . Kreher and Ruedebusch, UMTS Signaling: UMTS Interfaces, Protocols, Message Flows and Procedures Analyzed and Explained (Wiley 2007), . Laiho, Wacker and Novosad, Radio Network Planning and Optimization for UMTS (Wiley, 2002) first book on radio network planning for 3G, . Muratore, Flavio. UMTS: mobile communications for the future. John Wiley & Sons, Inc., 2000. . Documentation 3GPP specification series 25 Radio aspects of 3G, including UMTS TS 25.201 Physical Layer General Description Describes basic differences between FDD and TDD. TS 25.211 Physical channels and mapping of transport channels onto physical channels (FDD) TS 25.221 Physical channels and mapping of transport channels onto physical channels (TDD) TS 25.212 Multiplexing and channel coding (FDD) TS 25.222 Multiplexing and channel coding (TDD) TS 25.213 Spreading and modulation (FDD) TS 25.223