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• SCH reference signals in the centre of the band to allow for variable channel bandwidths
– Sent on central 62 subcarriers twice per frame
• Primary SCH
– Signal correlates to 1 of 3 cell identity sequences
– Provides subframe timing and frequency references
• Secondary SCH
– Identifies 1 of 168 cell identity groups
– Provides frame synchronisation
• Hence, Cell Identity is determined

The narrowest channel bandwidth is 72 subcarriers (6 Resource Blocks) but the SCH uses 62 since the processing for reception is simpler and hence quicker.
The primary SCH provides one of 3 possible sequences - the secondary SCH then gives the group Identity. Hence the mobile can then determine the specific cell identity from the 3 x 168 (504) possibilities.