1. 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, S1, 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, S2, 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 Nseq different sequences, wherein Nseq is at least ceil', 'transmitting, in a known one of the time slots of the radio frame, a synchronization signal, S1, 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, S2, 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 Nseq different sequences, wherein Nseq is at least ceil', '(


1
+


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+

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âx81¢
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)', 'different sequences;
the selected pair of sequences is uniquely identified with the particular cell group, wherein i, j ε1, . . . ,Nseq and {tilde over (S)}iâx89xa0{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.', 'the selected pair of sequences is uniquely identified with the particular cell group, wherein i, j ε1, . . . ,Nseq and {tilde over (S)}iâx89xa0{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.

2. The method of claim 1, wherein:
the physical layer of the cellular communication system employs Orthogonal Frequency Division Multiplexing;
the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j is effected by transmitting the sequence {tilde over (S)}i on a first set of one or more sub-carriers, and transmitting the sequence {tilde over (S)}j on a second set of one or more sub-carriers; and
the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j is effected by transmitting the sequence {tilde over (S)}j on the first set of one or more sub-carriers, and transmitting the sequence {tilde over (S)}j on the second set of one or more sub-carriers.', 'the physical layer of the cellular communication system employs Orthogonal Frequency Division Multiplexing;', 'the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j is effected by transmitting the sequence {tilde over (S)}i on a first set of one or more sub-carriers, and transmitting the sequence {tilde over (S)}j on a second set of one or more sub-carriers; and', 'the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j is effected by transmitting the sequence {tilde over (S)}j on the first set of one or more sub-carriers, and transmitting the sequence {tilde over (S)}j on the second set of one or more sub-carriers.

3. The method of claim 1, wherein:
in the physical layer of the cellular communication system, symbols of the synchronization signal, S1, are separated in a frequency domain;
the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j is effected by transmitting the sequence {tilde over (S)}i on a first set of frequencies, and transmitting the sequence {tilde over (S)}j on a second set of frequencies; and
the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j is effected by transmitting the sequence {tilde over (S)}j on the first set of frequencies, and transmitting the sequence {tilde over (S)}i on the second set of frequencies.', 'in the physical layer of the cellular communication system, symbols of the synchronization signal, S1, are separated in a frequency domain;', 'the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j is effected by transmitting the sequence {tilde over (S)}i on a first set of frequencies, and transmitting the sequence {tilde over (S)}j on a second set of frequencies; and', 'the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j is effected by transmitting the sequence {tilde over (S)}j on the first set of frequencies, and transmitting the sequence {tilde over (S)}i on the second set of frequencies.

4. The method of claim 1, wherein the use of the first ordering of the sequences only for transmission in the known one of the time slots of the radio frame, and the use of the second ordering of the sequences only for transmission in said another known one of the time slots enables detection of radio frame timing using just one of the synchronization signals, S1 and S2.

5. A method of detecting timing parameters and an identity of a particular cell group from a number, M, of possible cell groups in a signal received in a cellular communication system that employs a radio frame in a physical layer, the radio frame comprising a number of time slots including two time slots associated with a synchronization channel, the method comprising:
receiving, in one of the time slots associated with the synchronization channel, one of first and second synchronization signals, S1 and S2, wherein the first synchronization signal S1 comprises a pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a first ordering and the second synchronization signal S2 comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a second ordering;
determining which of a number of predefined sequences best matches the received sequence {tilde over (S)}i, which of the number of predefined sequences best matches the received sequence {tilde over (S)}j, and whether the pair of received sequences {tilde over (S)}i, {tilde over (S)}j were arranged in the first ordering or the second ordering, wherein the number of predefined sequences is selected from a group comprising Nseq different sequences, wherein Nseq is at least ceil', 'receiving, in one of the time slots associated with the synchronization channel, one of first and second synchronization signals, S1 and S2, wherein the first synchronization signal S1 comprises a pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a first ordering and the second synchronization signal S2 comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a second ordering;', 'determining which of a number of predefined sequences best matches the received sequence {tilde over (S)}i, which of the number of predefined sequences best matches the received sequence {tilde over (S)}j, and whether the pair of received sequences {tilde over (S)}i, {tilde over (S)}j were arranged in the first ordering or the second ordering, wherein the number of predefined sequences is selected from a group comprising Nseq different sequences, wherein Nseq is at least ceil', '(


1
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)', 'different sequences;
identifying the particular cell group by performing a cell group identification process that includes determining with which cell group the pair of received sequences, {tilde over (S)}i, {tilde over (S)}j, is uniquely associated; and
determining in which one of the two time slots associated with the synchronization channel the one of first and second synchronization signals was received by using information that indicates whether the sequences {tilde over (S)}i, {tilde over (S)}j were received in the first ordering or the second ordering.', 'identifying the particular cell group by performing a cell group identification process that includes determining with which cell group the pair of received sequences, {tilde over (S)}i, {tilde over (S)}j, is uniquely associated; and', 'determining in which one of the two time slots associated with the synchronization channel the one of first and second synchronization signals was received by using information that indicates whether the sequences {tilde over (S)}i, {tilde over (S)}j were received in the first ordering or the second ordering.', '6. The method of claim 5, wherein:
the physical layer of the cellular communication system employs Orthogonal Frequency Division Multiplexing;
the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on a first set of one or more sub-carriers, and the sequence {tilde over (S)}j to be received on a second set of one or more sub-carriers; and
the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}j to be received on the first set of one or more sub-carriers, and the sequence {tilde over (S)}i to be received on the second set of one or more sub-carriers.', 'the physical layer of the cellular communication system employs Orthogonal Frequency Division Multiplexing;', 'the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on a first set of one or more sub-carriers, and the sequence {tilde over (S)}j to be received on a second set of one or more sub-carriers; and', 'the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}j to be received on the first set of one or more sub-carriers, and the sequence {tilde over (S)}i to be received on the second set of one or more sub-carriers.', '7. The method of claim 6, wherein the first and second synchronization signals, S1 and S2, and the sequences and {tilde over (S)}i and {tilde over (S)}j are all of equal length.', '8. The method of claim 5, wherein:
in the physical layer of the cellular communication system, symbols of the synchronization signal, S1, are separated in a frequency domain;
the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on a first set of frequencies, and the sequence {tilde over (S)}j to be received on a second set of frequencies; and
the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}j to be received on the first set of frequencies, and the sequence {tilde over (S)}i to be received on the second set of frequencies.', 'in the physical layer of the cellular communication system, symbols of the synchronization signal, S1, are separated in a frequency domain;', 'the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on a first set of frequencies, and the sequence {tilde over (S)}j to be received on a second set of frequencies; and', 'the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}j to be received on the first set of frequencies, and the sequence {tilde over (S)}i to be received on the second set of frequencies.', '9. The method of claim 5, wherein receiving, in one of the time slots associated with the synchronization channel, one of the first and second synchronization signals S1 and s2 comprises:
receiving the pair of sequences {tilde over (S)}i, {tilde over (S)}j simultaneously.', 'receiving the pair of sequences {tilde over (S)}i, {tilde over (S)}j simultaneously.', '10. The method of claim 5, comprising:
detecting radio frame timing by using information that indicates in which one of the two time slots associated with the synchronization channel the one of the first and second synchronization signals was received.', 'detecting radio frame timing by using information that indicates in which one of the two time slots associated with the synchronization channel the one of the first and second synchronization signals was received.', '11. The method of claim 5, wherein identifying the particular cell group by determining with which cell group the pair of received sequences, {tilde over (S)}i, {tilde over (S)}j , is uniquely associated comprises using the pair of received sequences {tilde over (S)}i, {tilde over (S)}j to locate an entry in a look-up table.', '12. The method of claim 5, wherein identifying the particular cell group by determining with which cell group the pair of received sequences, {tilde over (S)}i, {tilde over (S)}j , is uniquely associated is performed by calculation circuitry.', '13. The method of claim 5, wherein using information about whether the sequences {tilde over (S)}i, {tilde over (S)}j were arranged in the first ordering or the second ordering to determine in which one of the two time slots associated with the synchronization channel the received one of the first and second synchronization signals was received comprises using the pair of received sequences {tilde over (S)}i, {tilde over (S)}j to locate an entry in a look-up table.', '14. The method of claim 5, wherein using information about whether the sequences {tilde over (S)}i, {tilde over (S)}j were arranged in the first ordering or the second ordering to determine in which one of the two time slots associated with the synchronization channel the received one of the first and second synchronization signals was received is performed by calculation circuitry.', '15. The method of claim 5, comprising:
receiving, in an other one of the time slots associated with the synchronization channel, an other one of the first and second synchronization signals;
determining whether a type of cell search procedure to be performed is an inter-frequency cell search procedure;
determining whether the type of cell search procedure to be performed is an inter-radio access technology cell search procedure;
determining whether the type of cell search procedure to be performed is an intra-cell search procedure;
if the type of cell search procedure to be performed is none of the inter-frequency cell search procedure, the inter-radio access technology cell search procedure, or the intra-cell search procedure, then performing:
determining which of the number of predefined sequences best matches the received sequence {tilde over (S)}i of the other one of the first and second synchronization signals, which of the number of predefined sequences best matches the received sequence {tilde over (S)}j of the other one of the first and second synchronization signals, and whether the pair of received sequences {tilde over (S)}i, {tilde over (S)}j of the other one of the first and second synchronization signals were arranged in the first ordering or the second ordering,

wherein the cell group identification process further includes determining with which cell group the pair of received sequences, {tilde over (S)}i, {tilde over (S)}j , of the other one of the first and second synchronization signals is uniquely associated.', 'receiving, in an other one of the time slots associated with the synchronization channel, an other one of the first and second synchronization signals;', 'determining whether a type of cell search procedure to be performed is an inter-frequency cell search procedure;', 'determining whether the type of cell search procedure to be performed is an inter-radio access technology cell search procedure;', 'determining whether the type of cell search procedure to be performed is an intra-cell search procedure;', 'if the type of cell search procedure to be performed is none of the inter-frequency cell search procedure, the inter-radio access technology cell search procedure, or the intra-cell search procedure, then performing:
determining which of the number of predefined sequences best matches the received sequence {tilde over (S)}i of the other one of the first and second synchronization signals, which of the number of predefined sequences best matches the received sequence {tilde over (S)}j of the other one of the first and second synchronization signals, and whether the pair of received sequences {tilde over (S)}i, {tilde over (S)}j of the other one of the first and second synchronization signals were arranged in the first ordering or the second ordering,', 'determining which of the number of predefined sequences best matches the received sequence {tilde over (S)}i of the other one of the first and second synchronization signals, which of the number of predefined sequences best matches the received sequence {tilde over (S)}j of the other one of the first and second synchronization signals, and whether the pair of received sequences {tilde over (S)}i, {tilde over (S)}j of the other one of the first and second synchronization signals were arranged in the first ordering or the second ordering,', 'wherein the cell group identification process further includes determining with which cell group the pair of received sequences, {tilde over (S)}i, {tilde over (S)}j , of the other one of the first and second synchronization signals is uniquely associated.', '16. An apparatus for 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 apparatus comprising:
circuit operable to transmit, in a known one of the time slots of the radio frame, a synchronization signal, S1, that comprises a pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a first ordering; and
circuit operable to transmit, in another known one of the time slots of the radio frame, a synchronization signal, S2, 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 Nseq different sequences, wherein Nseq is at least ceil', 'circuit operable to transmit, in a known one of the time slots of the radio frame, a synchronization signal, S1, that comprises a pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a first ordering; and', 'circuit operable to transmit, in another known one of the time slots of the radio frame, a synchronization signal, S2, 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 Nseq different sequences, wherein Nseq is at least ceil', '(


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)', 'different sequences;
the selected pair of sequences is uniquely identified with the particular cell group, wherein i, j ε1, . . . ,Nseq and {tilde over (S)}iâx89xa0{tilde over (S)}j; and
the apparatus is operable to operate such that 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.', 'the selected pair of sequences is uniquely identified with the particular cell group, wherein i, j ε1, . . . ,Nseq and {tilde over (S)}iâx89xa0{tilde over (S)}j; and', 'the apparatus is operable to operate such that 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.', '17. The apparatus of claim 16, wherein:
the physical layer of the cellular communication system employs Orthogonal Frequency Division Multiplexing;
the circuit operable to transmit, in the known one of the time slots of the radio frame, the synchronization signal, S1, that comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in the first ordering effects the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j by transmitting the sequence {tilde over (S)}i on a first set of one or more sub-carriers, and transmitting the sequence {tilde over (S)}j on a second set of one or more sub-carriers; and
the circuit operable to transmit, in said another known one of the time slots of the radio frame, the synchronization signal, S2, that comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in the second ordering effects the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j by transmitting the sequence {tilde over (S)}i the first set of one or more sub-carriers, and transmitting the sequence {tilde over (S)}i on the second set of one or more sub-carriers.', 'the physical layer of the cellular communication system employs Orthogonal Frequency Division Multiplexing;', 'the circuit operable to transmit, in the known one of the time slots of the radio frame, the synchronization signal, S1, that comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in the first ordering effects the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j by transmitting the sequence {tilde over (S)}i on a first set of one or more sub-carriers, and transmitting the sequence {tilde over (S)}j on a second set of one or more sub-carriers; and', 'the circuit operable to transmit, in said another known one of the time slots of the radio frame, the synchronization signal, S2, that comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in the second ordering effects the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j by transmitting the sequence {tilde over (S)}i the first set of one or more sub-carriers, and transmitting the sequence {tilde over (S)}i on the second set of one or more sub-carriers.', '18. The apparatus of claim 17, wherein the first and second synchronization signals, S1 and S2, and the sequences {tilde over (S)}i and {tilde over (S)}j are all of equal length.', '19. The apparatus of claim 16, wherein:
in the physical layer of the cellular communication system, symbols of the synchronization signal, S1, are separated in a frequency domain;
the circuit operable to transmit, in the known one of the time slots of the radio frame, the synchronization signal, S1, that comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in the first ordering effects the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j by transmitting the sequence {tilde over (S)}i on a first set of frequencies, and transmitting the sequence {tilde over (S)}j on a second set of frequencies; and
the circuit operable to transmit, in said another known one of the time slots of the radio frame, the synchronization signal, S2, that comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in the second ordering effects the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j by transmitting the sequence {tilde over (S)}j on the first set of frequencies, and transmitting the sequence {tilde over (S)}i on the second set of frequencies.', 'in the physical layer of the cellular communication system, symbols of the synchronization signal, S1, are separated in a frequency domain;', 'the circuit operable to transmit, in the known one of the time slots of the radio frame, the synchronization signal, S1, that comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in the first ordering effects the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j by transmitting the sequence {tilde over (S)}i on a first set of frequencies, and transmitting the sequence {tilde over (S)}j on a second set of frequencies; and', 'the circuit operable to transmit, in said another known one of the time slots of the radio frame, the synchronization signal, S2, that comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in the second ordering effects the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j by transmitting the sequence {tilde over (S)}j on the first set of frequencies, and transmitting the sequence {tilde over (S)}i on the second set of frequencies.

20. The apparatus of claim 16, wherein the use of the first ordering of the sequences only for transmission in the known one of the time slots of the radio frame, and the use of the second ordering of the sequences only for transmission in said another known one of the time slots enables detection of radio frame timing using just one of the synchronization signals, S1 and S2.

21. An apparatus for detecting timing parameters and an identity of a particular cell group from a number, M, of possible cell groups in a signal received in a cellular communication system that employs a radio frame in a physical layer, the radio frame comprising a number of time slots including two time slots associated with a synchronization channel, the apparatus comprising:
circuit operable to receive, in one of the time slots associated with the synchronization channel, one of first and second synchronization signals, S1 and S2, wherein the first synchronization signal S1 comprises a pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a first ordering and the second synchronization signal S2 comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a second ordering;
circuit operable to determine which of a number of predefined sequences best matches the received sequence {tilde over (S)}i , which of the number of predefined sequences best matches the received sequence {tilde over (S)}j , and whether the pair of received sequences {tilde over (S)}i, {tilde over (S)}j were arranged in the first ordering or the second ordering, wherein the number of predefined sequences is selected from a group comprising Nseq different sequences, wherein Nseq is at least ceil', 'circuit operable to receive, in one of the time slots associated with the synchronization channel, one of first and second synchronization signals, S1 and S2, wherein the first synchronization signal S1 comprises a pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a first ordering and the second synchronization signal S2 comprises the pair of sequences, {tilde over (S)}i, {tilde over (S)}j arranged in a second ordering;', 'circuit operable to determine which of a number of predefined sequences best matches the received sequence {tilde over (S)}i , which of the number of predefined sequences best matches the received sequence {tilde over (S)}j , and whether the pair of received sequences {tilde over (S)}i, {tilde over (S)}j were arranged in the first ordering or the second ordering, wherein the number of predefined sequences is selected from a group comprising Nseq different sequences, wherein Nseq is at least ceil', '(


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)', 'different sequences;
circuit operable to identify the particular cell group by performing a cell group identification process that includes determining with which cell group the pair of received sequences, {tilde over (S)}i, {tilde over (S)}j , is uniquely associated; and
circuit operable to determine in which one of the two time slots associated with the synchronization channel the one of first and second synchronization signals was received by using information that indicates whether the sequences {tilde over (S)}i, {tilde over (S)}j were received in the first ordering or the second ordering.', 'circuit operable to identify the particular cell group by performing a cell group identification process that includes determining with which cell group the pair of received sequences, {tilde over (S)}i, {tilde over (S)}j , is uniquely associated; and', 'circuit operable to determine in which one of the two time slots associated with the synchronization channel the one of first and second synchronization signals was received by using information that indicates whether the sequences {tilde over (S)}i, {tilde over (S)}j were received in the first ordering or the second ordering.

22. The apparatus of claim 21, wherein:
the physical layer of the cellular communication system employs Orthogonal Frequency Division Multiplexing;
the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on a first set of one or more sub-carriers, and the sequence {tilde over (S)}j to be received on a second set of one or more sub-carriers; and
the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}j to be received on the first set of one or more sub-carriers, and the sequence {tilde over (S)}i to be received on the second set of one or more sub-carriers.', 'the physical layer of the cellular communication system employs Orthogonal Frequency Division Multiplexing;', 'the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on a first set of one or more sub-carriers, and the sequence {tilde over (S)}j to be received on a second set of one or more sub-carriers; and', 'the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}j to be received on the first set of one or more sub-carriers, and the sequence {tilde over (S)}i to be received on the second set of one or more sub-carriers.

23. The apparatus of claim 22, wherein the first and second synchronization signals, S1 and S2, and the sequences {tilde over (S)}i and {tilde over (S)}j are all of equal length.

24. The apparatus of claim 21, wherein:
in the physical layer of the cellular communication system, symbols of the synchronization signal, S1, are separated in a frequency domain;
the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on a first set of frequencies, and the sequence {tilde over (S)}j to be received on a second set of frequencies; and
the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on the first set of frequencies, and the sequence {tilde over (S)}i to be received on the second set of frequencies.', 'in the physical layer of the cellular communication system, symbols of the synchronization signal, S1, are separated in a frequency domain;', 'the first ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on a first set of frequencies, and the sequence {tilde over (S)}j to be received on a second set of frequencies; and', 'the second ordering of the pair of sequences, {tilde over (S)}i, {tilde over (S)}j causes the sequence {tilde over (S)}i to be received on the first set of frequencies, and the sequence {tilde over (S)}i to be received on the second set of frequencies.

25. The apparatus of claim 21, wherein the circuit operable to receive, in one of the time slots associated with the synchronization channel, one of the first and second synchronization signals S1 and S2 comprises:
circuit operable to receive the pair of sequences {tilde over (S)}i, {tilde over (S)}j simultaneously.', 'circuit operable to receive the pair of sequences {tilde over (S)}i, {tilde over (S)}j simultaneously.

26. The apparatus of claim 21, comprising:
circuit operable to detect radio frame timing by using information that indicates in which one of the two time slots associated with