UTRA - UTRAN
The radio technology used between mobile terminals and the base stations of 3GPPTM systems is generically known as 'Universal Terrestrial Radio Access' (UTRA) and the access network as 'Universal Terrestrial Radio Access Network' (UTRAN).
The basic modulation technique is Wideband Code Division Multiple Access (W-CDMA) but interworking with other technologies such as wireless local are networks, wireless metropolitan networks, and of course, GSM/EDGE radio access technologies (GERAN) is also envisaged.
Long- term evolution
UTRA, with the enhancements provided by High Speed Packet Access (HSPA), for both downlink and uplink, will remain highly competitive for several years. Nevertheless, the industry that has developed the 3GPPTM technologies is anxious to ensure the continued competitiveness of those technologies and has launched a Long Term Evolution project within 3GPP.
The focus of the LTE project is on:
enhancement of the Universal Terrestrial Radio Access (UTRA)
optimization of the UTRAN architecture.
A parallel activity is taking place on the evolution of the 3GPPTM system architecture. Descriptions of both activities can be found on the 3GPPTM website.