In LTE, multiple antenna can be used. Transmission Mode determines the way these antenna are being used. For example, what we normally call 'SISO' (Single Transmission Antenna and Single Reciever Antenna) is called 'TM1(Transmission Mode 1)'.
Transmission Mode 1
Single-antenna port, port 0
Transmission Mode 2
Transmit diversity
Transmission Mode 3
Transmit diversity if the associated rank indicator is 1, otherwise large delay CDD
Transmission Mode 4
Closed-loop spatial multiplexing
Transmission Mode 5
Mutil-user MIMO
Transmission Mode 6
Closed-loop spatial multiplexing with a single transmission layer
Transmission Mode 7
If the number of PBCH antenna ports in one, Single-antenna port, port 0; otherwise Transmit diversity
References
[1] http://www.sharetechnote.com/html/Handbook_LTE_TransmissionMode.html
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