What is TM9 (TM9)?
Sarah Cherry
Published Feb 18, 2026
What is TM9 (TM9)?
TM9 can be combined with carrier aggregation and eICIC to create a highly spectrum efficient network. TM9 is a new transmission mode introduced in 3GPP Release 10. In TM9, UE-specific RSs are introduced, and CSI measurement and data demodulation are performed by different RSs.
What is 3GPP TM9?
In Release-10 (LTE-A) 3GPP Introduced a new transmission mode, TM 9. TM9 is designed to help reduce interference between base stations to maximize signal stability and boost performance. The new TM-9 enables the enhancement of network capabilities and performance with minimum addition of overhead.
What is the DCI format used for TM9?
A new Downli n k Control Information (DCI) format — known as format 2C — is used for TM9 data scheduling. Two new reference signals are defined in TM9: Channel State Information Reference Signal (CSI-RS) and Demodulation Reference Signal (DMRS).
What are the benefits of TM9 CEUs?
In TM9, CEUs can successfully demodulate and combine the data streams of neighboring cells, effectively turning interference into gains while improving CEU experience. Cell edge user (CEU) experience is poor due to the interference caused by neighboring cells.
