al layer cell identity groups, each group containing three unique identities. The secondary synchronization signal carries the physical layer cell identity group, and the primary synchronization signal carries the physical layer identity 0, 1, or 2 [95,102,116]. As shown in Figure 9-76, the primary synchronization signal is transmitted on the sixth symbol of slots 0 and 10 of each Type 1 radio frame and occupies 62 sub-carriers, centered on the DC sub-carrier. The primary synchronization signal is generated from a frequency-domain Zadoff-Chu sequence. The secondary synchronization signal is transmitted on the fifth symbol of slots 0 and 10 of each radio frame. It occupies 62 sub-carriers centered on the DC sub-carrier. The secondary synchronization signal is an interleaved concatenation of two length-31 M- sequences. The concatenated sequence is scrambled with a scrambling sequence given by the primary synchronization signal [30,95,102,116]. As shown in Figure 9-72, PBCH is transmitted on symbols 0 to 3 of slot 1 and occupies 72 sub-carriers centered on the DC sub-carrier. The coded BCH transport block is mapped to four subframes within a 40 ms interval (see Figure 9-77). The 40 ms timing is blindly detected, i.e., there is no explicit signaling to indicate 40 ms timing [30]. These channels are contained within the central 1.08 MHz (corresponding to six resource blocks) frequency band SO that the system operation can be independent of the channel bandwidth. As shown in Figure 9-80, during cell search different types of information need to be identified by the UE. This information includes symbol and radio frame timing, frequency, cell identification, overall transmission bandwidth, antenna configuration, and cyclic prefix length. The first step of cell search in 3GPP LTE is based on specific synchronization signals, a primary synchronization signal, and a secondary synchronization signal. The synchronization signals are transmitted twice per 10 ms on predefined slots. In addition, the Master Information Block car