Embodiments of the invention generally relate to neighbor cell measurement in a communication network. A method implemented by a first base station of a first operator, the first base station having a first cell identity, comprises: sending, to a first neighbor base station of the first operator, a request for a neighbor cell identity of the first neighbor base station, the first neighbor base station being adjacent to the first base station; receiving, from the first neighbor base station, a second cell identity of a second base station of a second operator, the second operator being different from the first operator, and the second base station being adjacent to the first neighbor base station; and determining the first cell identity at least in part based on the received second cell identity. In this way, an effective and efficient way is provided for a BS of an operator to obtain a cell identity of a further BS of a different operator.