ference power equals the sum of the power allocated to both midambles m(1) and m². According to [6] two options are: In the absence of block STTD antenna diversity application to the P-CCPCH, all the reference power of any physical channel providing the beacon function goes to When block STTD antenna diversity applies to the P-CCPCH, physical channels providing beacon function midambles m () and m² share the reference power, i.e. midamble m ¹ applies to the first antenna and m² applies to the diversity antenna. The data in P-CCPCH uses block STTD encoding [9]. For all other physical chan- nels, both antennas transmit identical data sequences. 4.4.10 Allocating Midamble to Physical Channels Generally high layers configure DL physical channels with midambles. Otherwise, they allocate default midambles by fixed association between midambles and channelization codes. Different associations apply for different burst types and cell configurations with respect to the maximum number of midambles. Physical channels providing the beacon function shall always use the reserved midambles. For all other DL physical channels the midamble allocation is signalled or given by default. In the UL, if the physical channel has a midamble as part of its configuration, we assign an individual midamble to all UEs in one time slot. Otherwise, when higher layers do not allocate midambles, the UE will derive the midamble from the assigned channeliza- tion code as for DL physical channels. If the UE changes the SF according to the data rate, it shall always vary the channelization code along the lower branch of the OVSF tree. See more midamble details in [6]. 4.4.11 Mapping Transport Channels onto Physical Channels Table 4.36 summarizes the mapping of the transport channels onto the physical chan- nels. The UTRA Physical Layer Design 4.4.11.1 Dedicated Transport Channels We map a dedicated transport channel onto one or more physical channels, where an interleaving period association occurs with each allocation. The frame is subdivided into s