The correct answer is False. W-CDMA can work in both FDD and TDD mode.
FDD stands for Frequency Division Duplexing. In FDD, the uplink and downlink frequencies are separated by a guard band. This means that the uplink and downlink signals do not interfere with each other. FDD is the most common type of duplexing used in cellular networks.
TDD stands for Time Division Duplexing. In TDD, the uplink and downlink frequencies are shared in time. This means that the uplink and downlink signals are transmitted on the same frequency, but at different times. TDD is less common than FDD, but it has some advantages, such as lower cost and better spectrum efficiency.
W-CDMA is a type of 3G cellular technology. It was developed by the Third Generation Partnership Project (3GPP). W-CDMA is a wideband code division multiple access (WCDMA) technology. WCDMA is a type of spread spectrum technology. Spread spectrum technologies spread the signal over a wide frequency range, which makes it more difficult to interfere with other signals.
W-CDMA can be used in both FDD and TDD mode. FDD W-CDMA is the most common type of W-CDMA. TDD W-CDMA is less common, but it is used in some networks, such as the UMTS network in Japan.
The main advantage of FDD W-CDMA is that it is more robust to interference. This is because the uplink and downlink frequencies are separated by a guard band. The main advantage of TDD W-CDMA is that it is more spectrum efficient. This is because the uplink and downlink frequencies are shared in time.
In conclusion, the correct answer to the question “W-CDMA works in FDD mode only” is False. W-CDMA can work in both FDD and TDD mode.