He explains this two sentences later: >- Several cellIDs map to the same eNB lat/long coordinates. That's because the antennas mounted on an eNB don't have 360

He explains this two sentences later: >- Several cellIDs map to the same eNB lat/long coordinates. That's because the antennas mounted on an eNB don't have 360° coverage. The angle and range of each antenna carves the space into pizza slice shaped cells.