Patent ID: 7961709

Claim:
A method of indicating timing parameters and an identity of a particular cell group from a number, M, of possible cell groups in a signal transmitted in a cellular communication system that employs a radio frame in a physical layer, the radio frame comprising a number of time slots, the method comprising: transmitting, in a known one of the time slots of the radio frame, a synchronization signal, S 1 , that comprises a pair of sequences, {tilde over (S)} i , {tilde over (S)} j arranged in a first ordering; and transmitting, in another known one of the time slots of the radio frame, a synchronization signal, S 2 , that comprises the pair of sequences, {tilde over (S)} i , {tilde over (S)} j arranged in a second ordering, wherein: each member of the pair of sequences, {tilde over (S)} i , {tilde over (S)} j is selected from a group comprising N seq different sequences, wherein N seq is at least ceil ( 1 + 1 + 8 ⁢ M 2 ) different sequences; the selected pair of sequences is uniquely identified with the particular cell group, wherein i, j ε[1, . . . ,N seq ] and {tilde over (S)} i ≠{tilde over (S)} j ; and the first ordering of the sequences is used only for transmission in the known one of the time slots of the radio frame, and the second ordering of the sequences is used only for transmission in said another known one of the time slots.