Secondary synchronization sequences for cell group detection in a cellular communications system

In in a cellular communication system sending the signal indication of the plurality of cells in the set of special block the fixed time parameter and identifying cellular communication system in the physical layer is provided in the wireless frame wireless frame includes several time slot. On these time slots to a known time slot sending synchronous signal s1 the said synchronizing signal s1 s2 according to the first sequence a pair of sequence. On these time slots the other one of the known time slot sending synchronous signal s2 the said synchronizing signal s2 comprises according to the second sequence of said a pair of sequences ii. A pair of the selected sequence the specific of the cell packets uniquely identified and the sequence of the first order only used in these time slots in a known time slot to transmit to the sequence of the second sequence only used in these time slots in the a known time slot to transmit.