The fact is, when the MS can successfully camp on the cell, either the test cell or the neighbours, the frame offset and quarter-bit offset are of similar range. However for those cells that the MS have problem in decoding the SCH, both offsets are zero.
We just have the BTS sync to the E1 link, no GPS. We use Nokia BTS.
BTW, do anybody have more info about the frame offset and quarter-bit offset? Which ETSI doc should I look up?