Deciphering the History of Development and Change of Mobile Communication Technology What is communication? (4)

4G Network Standard Appendix:

TD-LTE:

LTE is a global standard based on OFDMA technology and formulated by the 3GPP organization, including two modes of FDD and TDD for paired spectrum and unpaired spectrum.

TD-LTE, namely Time Division Long Term Evolution, is jointly formulated by major global enterprises and operators covered by the 3GPP organization. The two modes of FDD and TDD in the LTE standard are essentially the same, and there are only minor differences between the two modes, with a similarity of 90%. Time Division Duplexing (TDD) is one of the duplex technologies used in mobile communication technologies and corresponds to FDD frequency division duplexing.

FDD-LTE:

LTE is based on Orthogonal Frequency Division Multiple Access (OFDMA) technology and is a global standard formulated by the 3GPP organization, including two modes of FDD and TDD for paired spectrum and unpaired spectrum. There are only minor differences between the FDD and TD modes in the LTE standard, with a similarity of 90%.

Due to factors such as differences in wireless technologies, different frequency bands used, and the interests of various manufacturers, the standardization and industrial development of FDD-LTE are ahead of TD-LTE. FDD-LTE has become the most widely used 4G standard in countries and regions in the world, with the most diverse types of terminals.

The difference between the two:

Both TD-LTE and FDD-LTE are time-division long-term evolution technologies, but TD-LTE is a long-term evolution technology of the TDD version, which is called time-division duplex technology. And FDD-LTE is also a long-term evolution technology. The difference is that FDD-LTE adopts the frequency division mode. Similar to the time division multiplexing technology and frequency division multiplexing technology in the network course.