In indoor positioning scenarios with only one single base station (BS), when using cellular signals for opportunistic positioning, the time of arrival (TOA) obtained by the receiver can only achieve ranging information. This paper combines the TOA ranging method with the fingerprint positioning approach. TOA and one-reflection path are introduced as fingerprint features to realize indoor positioning in the case of one single BS. Simulation results show that the mean positioning error of the proposed method can reach 0.312m when the fingerprint interval is 0.5m. This method is suitable for future 6G cellular signal opportunity positioning.