1. A method in a first base station for automatically determining neighbor cells, comprising: receiving at least one of cell information from a neighboring base station and cell information from a mobile terminal of a cell served by the first base station; comparing the received cell information with a list of old neighbor cells stored in the first base station; when a new cell is detected, determining whether the detected new cell covers the same geographical area as any of the old neighbor cells; and when the new cell covers the same geographical area as at least one of the cells of the list, storing the new cell as a neighbor cell in the list.