f 3:2 (i.e., UL/DL configuration 1). In the TDD mode, the relative overhead due to synchronization signals and physical broadcast channels depends on the operation bandwidth and the DL/UL configuration. A total of 528 resource elements per 10 ms radio frame are used for the synchronization signals and the broadcast channel when using four CRS ports. For a DL:UL ratio of 3:2, the latter overhead translates into approximately 1.0% and 0.5%, for 10 and 20 MHz operation bandwidth, respectively. The amount of SRS overhead depends on the SRS transmission interval, the SRS bandwidth, and the usage of UpPTS in the special subframe. For a DL:UL ratio of 3:2 with four DL/UL switching points per 10 ms radio frame, the SRS transmission with the same interval as a TDD UL/DL transmission of 5 ms and full band SRS within UpPTS, the relative overhead is approximately 3.45%. The amount of uplink resources reserved for random access depends on the configuration of the random access channel. In a typical case with a DL:UL ratio of 3:2 and PRACH preamble format of 0, six resource blocks per radio frame are used for the physical random access channel, resulting in a relative overhead of 1.4%, 2.8%, 5.6% for a channel bandwidth of 20, 10, and 5 MHz, respectively. 12.10.7 Frequency Bands and Operation Bandwidth The frequency bands in which the 3GPP LTE, 3GPP LTE-Advanced FDD, and TDD modes can be deployed are shown in Table 12-27. The operating bands of the 3GPPLTE-Advanced include E-UTRA operating bands, as well as possible new IMT bands to be identified by the ITU-R. In both FDD and TDD modes, each component carrier supports a scalable bandwidth of 1.4, 3, 5, 10, 15, and 20 MHz. By aggregating multiple component carriers, wider transmission bandwidths up to 100 MHz are supported. 12.10.8 3GPP LTE-Advanced Link Budget The LTE-Advanced link budget under various deployment scenarios specified by the ITU-R was evaluated as part of the IMT-Advanced submission. Table 12-28 summarizes the link budget of the TDD mode. It is shown that the 3G