37.1443GPPRelease 16TSUser Equipment (UE) and Mobile Station (MS) GSM, UTRA and E-UTRA over the air performance requirements
4.1 Minimum requirements for roaming bands
The minimum requirements for roaming bands apply only to the primary mechanical mode in the environmental conditions specified in Annex A. All bands are potential roaming bands, and a UE/MS shall fulfil the minimum requirements for roaming bands for all bands supported by the UE/MS.
4.2 Relationship between minimum requirements for roaming bands and test requirements
The minimum requirements for roaming bands given in this specification make no allowance for measurement uncertainty. The test specification 34.114  Annex F defines test tolerances. These test tolerances are individually calculated for each test. The test tolerances are used to relax the minimum requirements in this specification to create test requirements.
The measurement results returned by the test system are compared – without any modification – against the test requirements as defined by the shared risk principle.
The shared risk principle is defined in ETR 273  Part 1 sub-part 2 section 6.5.
4.3 Terminal classes
4.3.1 Mechanical modes
The mechanical modes of a device under test (DUT) are declared by the manufacturer. A DUT shall have at least one mechanical mode. If only one mode is supported, then this is defined as the primary.
4.4 UTRA chip rates
The requirements defined in this specification for UTRA are based on a chip rate of 3.84 Mcps (FDD) and 1.28 Mcps (TDD).
NOTE: Other chip rates may be considered in future releases.