4.14 Physical layer procedures for 3.84 Mcps MBSFN IMB

25.2243GPPPhysical layer procedures (TDD)TS

4.14.1 Radio frame timing on the MBSFN layer

MBSFN cluster search and radio frame synchronisation on the MBSFN layer can be performed via SCH, e.g. by following the steps described in Annex C of [6]. After the primary scrambling code has been identified, the P-CCPCH can be detected and MBSFN system information can be read.

4.14.2 Downlink power control

The transmit powers of all downlink physical channels is determined by the network.

4.14.2.1 S-CCPCH

The TFCI field shall be transmitted at the same constellation power as the data field of the associated physical channel.

For MBSFN FACH transmission with 16QAM, the UE is informed about the relative transmit power of the S-CCPCH (measured as the power of the transmitted data of S-CCPCH) compared to the primary CPICH transmit power by the higher layers.

4.14.2.2 MICH

The UE is informed about the relative transmit power of the MICH (measured as the power over the notification indicators) compared to the primary CPICH transmit power by the higher layers.

4.14.2.3 P-CPICH

The UE may assume that the P-CPICH is transmitted with constant power.

4.14.2.4 T-CPICH

The UE may assume that each constituent OVSF code of the T-CPICH is transmitted with equal power. The UE may also assume the ratio of power allocated to the T-CPICH and P-CPICH is constant.