Key Technologies

Some of the critical technologies essential for the successful introduction of UMTS include the following.

UTRA

The ETSI decision in January 1998 on the radio access technique for UMTS combined two technologies — WCDMA for paired spectrum bands and TD-CDMA for unpaired bands — into one common standard. The network architecture is shown in Figure 25-9. This powerful approach promises an optimum solution for all the different operating environments and service needs. The transmission rate capability of UTRA will provide at least 144 Kbps for full mobility applications in all environments, 384 Kbps for limited mobility applications in the macro and micro cellular environments, and 2.048 Mbps for low mobility applications particularly in the micro- and picocell environments. The 2.048 Mbps rate may also be available for short range or packet applications in the macro-cellular environment, depending on deployment strategies, radio network planning, and spectrum availability.

Figure 25-9: The architecture for 3G

Multimode Second Generation/UMTS Terminals

Figure 25-9: The architecture for 3G

Multimode Second Generation/UMTS Terminals

UMTS terminals will exist in a world of multiple standards, and this will enable operators to offer maximum capacity and coverage to their user base by combining UTRA with second generation (2G) and other 3G standards. Therefore, operators will need terminals that are able to interwork with legacy infrastructures, such as GSM/DCS1800 and DECT, as well as other 2G worldwide standards, such as those based on the U.S. AMPS standard, because they will initially have more complete coverage than UMTS. Many UMTS terminals will therefore be multiband and multimode so that they can work with different standards, old and new. Achieving such terminals at a cost that is comparable with contemporary single mode 2G terminals will become possible because of technological advances in semiconductor integration, radio architectures, and software radio.

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