or TDD. The FDD 1749.9-1784.9 1844.9-1879.9 Japan bands are numbered with Roman numerals from I to X as 1710-1770 2110-2170 Americas shown in Table 4.1-1 and in Figure 4.1-5. The TDD bands have alphabetical designations (a) -(d) as shown in Table 4.1-2. With the release independence of the specifica- tions, all bands can be implemented using only Release 99 requirements were defined in Release 5 of the 3GPP functionality. specifications. The release-independence implies that Some of the FDD bands are partly or fully over- a new frequency band added at a later release can be lapping. This is in most cases explained by regional dif- implemented also for earlier releases. All bands are also ferences in how the bands defined in M.1036 are defined with consideration of what other bands may be implemented. At the same time, a high degree of com- deployed in the same region through special coexistence monality is desired to enable global roaming. requirements for both base stations and terminals. These Band IV was introduced as a new band for the tailored requirements enable coexistence between 3G Americas following the addition of the 3G bands at (and 2G) deployments in different bands in the same WRC-2000. Its downlink overlaps completely with the 2110 2200 IMT-2000 IMT-2000 IMT-2000 IMT-2000 FDD Band I FDD Band II Mainly for Americas 1910 1930 FDD Band III FDD Band IV FDD Band V Mainly for Americas FDD Band VI For Japan FDD Band VII FDD Band VIII 915 925 FDD Band IX For Japan 1749,9 1784,9 1844,9 1879,9 FDD Band X Uplink Downlink Figure 4.1-5 Operating bands for UTRA FDD specified in 3GPP. CHAPTER 4.1 Background of 3G evolution downlink of Band I, which facilitates roaming and eases and Band VI is the first step of aligning the Japanese the design of dual band I/IV terminals. spectrum plan in the 810-960 MHz range to that of Band X is an extension of Band IV from 2 X 45 to 2 X other parts of the world. 60 MHz. Band IX overlaps with Band III, but is also intended Bands Vand VI overlap, but are intended for different o