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Extra resources for Introduction to 3G Mobile Communications
Example text
Thus, one MS UL signal BSS “Outer loop” “Inner loop” Power control commands Decoding UL signal Power amplifier DEMUX Decoding and quality meas. SIR meas. 13 1 Uplink closed-loop power control. ) The dedicated physical control channel (DPCCH) and the dedicated physical data channel (DPDCH) are two of many physical channels within the WCDMA radio interface. These are fully described in Chapter 3. Dedicated channels are those associated with a particular connection between a base station and a mobile station.
The TD-SCDMA mode is similar to the TDD mode in that a time slot can be shared by up to 16 users. Spreading codes and spreading factors are similar to the TDD mode too, that is, spreading factors of 1, 2, 4, 8, or 16 can be used, but in the downlink only 1 and 16 are allowed. However, multicodes can be employed in the downlink to overcome this limitation. 3 TD-SCDMA subframe. planning purposes. This is an important factor, especially if the operator has been given only small spectrum allocations.
The UTRA TDD mode is especially well described in [8, 9]. The 3GPP specifications for the TDD mode radio interface are [10–14]. 2 TD-SCDMA In addition to standard UTRA TDD, there is also another TDD specification within the IMT-2000 umbrella. Time-division synchronous CDMA (TD-SCDMA) is a narrowband version of UTRA TDD developed by the China Academy of Telecommunications Technology (CATT) supported by Siemens. 28 Mcps TDD option. 6 MHz. In some sources the 5-MHz TDD mode is called high chip rate (HCR) TDD mode to emphasize the difference between these two modes, but usually it is simply called the TDD mode.