5.12A MU-MIMO operation of HS-DSCH and E-DCH

25.2243GPPPhysical layer procedures (TDD)TS

If the UE is configured in MU-MIMO mode, the Node B should estimates the uplink channels seen from each antenna by uplink physical channels or standalone midamble channel. The Node B scheduler decides whether to schedule multiple UE using the same physical resource in one TTI according to uplink channel estimation.

For the MU-MIMO operation of HS-DSCH, the special default midamble pattern is signaled on HS-SCCH to inform the UE which special default midamble pattern is used. The UE transmits the CQI report and ACK/NACK to the Node B via the associated HS-SICH.

For the MU-MIMO operation of E-DCH, the special default midamble pattern is signaled on E-AGCH to inform the UE which special midamble pattern is used. The Node B transmits ACK/NACK to the each user via the associated E-HICH signature sequence.