Transmission Modes and Transmission Schemes

The UE procedure for receiving the physical downlink shared channel (PDSCH) is outlined in TS 36.213 [1], Section 7.1. Transmission mode combinations the UE shall use to decode PDCCH and any corresponding PDSCH, as defined in TS 36.213 [1], Table 7.1-5, are indicated here:

Transmission modes (TM)	DCI format	Transmission schemes
TM1	1A	Single antenna port, port0
	1
TM2	1A	Transmit diversity
	1
TM3	1A	Transmit diversity
	2A	Open-loop codebook based precoding (large delay CDD) or transmit diversity
TM4	1A	Transmit diversity
	2	Closed-loop codebook based precoding
TM5	1A	Transmit diversity
	1D	Multiuser MIMO version of TM4
TM6	1A	Transmit diversity
	1B	Closed loop codebook based precoding for single layer
TM7	1A	Single antenna port, port 0 if the number of PBCH antenna ports is one, otherwise transmit diversity
	1	Non-codebook based precoding for single layer (single antenna port, port 5)
TM8	1A	Single antenna port, port 0 if the number of PBCH antenna ports is one, transmit diversity otherwise
	2B	Non-codebook based precoding for up to two layers (dual layer port 7 and 8 or single antenna port, port 7 or 8)
TM9	1A	For non-MBSFN subframe: Single antenna port, port 0 if the number of PBCH antenna ports is one, transmit diversity otherwise MBSFN subframe: single antenna port, port 7
	2C	Non-codebook based precoding for up to eight layers (up to eight layer transmission ports 7–14 or single antenna port, port 7 or 8)
TM10	1A	For non-MBSFN subframe: Single antenna port, port 0 if the number of PBCH antenna ports is one, transmit diversity otherwise MBSFN subframe: single antenna port, port 7
	2D	Extension of TM9 for CoMP (up to eight layer transmission ports 7–14 or single antenna port, port 7 or 8)

References

[1] 3GPP TS 36.213. “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: https://www.3gpp.org.