A method for positioning a terminal device, performed by a baseband processing unit, BBU, the method comprising, identifying a plurality of Pico Radio Remote Units, Pico RRUs, corresponding to a logical cell where a target terminal device is located, in response to a request for positioning the target terminal device being received, wherein the target terminal device is connected to network through the BBU, and the number of the plurality of Pico RRUs is greater than or equal to three; acquiring a plurality of converged signals each corresponding to a respective one of the plurality of Pico RRUs, wherein the converged signal corresponding to each current Pico RRU is acquired by converging of, a processed radio frequency signal received by the current Pico RRU, and radio frequency signals each received by a respective one of other Pico RRUs than the current Pico RRU in the plurality of Pico RRUs; calculating geographic location information of the target terminal device according to the converged signals each corresponding to a respective one of the plurality of Pico RRUs and geographic location information of at least three of the plurality of Pico RRUs; and sending positioning information of the target terminal device to a sender of the request for positioning, wherein, the positioning information comprises at least the geographic location information of the target terminal device; wherein calculating the geographic location information of the target terminal device according to the converged signals each corresponding to a respective one of the plurality of Pico RRUs and geographic location information of at least three of the plurality of Pico RRUs, comprises, for each converged signal corresponding to the current Pico RRU, decomposing a signal corresponding to the target terminal device from the converged signal corresponding to the current Pico RRU, and generating a value of a received signal strength, RSSI, of the current Pico RRU with respect to the target terminal device according to the signal corresponding to the target terminal device; selecting at least three Pico RRUs closest to the target terminal device according to the RSSI value, from the plurality of Pico RRUs; and calculating the geographic location information of the target terminal device according to the geographic location information of the selected Pico RRUs. identifying a plurality of Pico Radio Remote Units, Pico RRUs, corresponding to a logical cell where a target terminal device is located, in response to a request for positioning the target terminal device being received, wherein the target terminal device is connected to network through the BBU, and the number of the plurality of Pico RRUs is greater than or equal to three; acquiring a plurality of converged signals each corresponding to a respective one of the plurality of Pico RRUs, wherein the converged signal corresponding to each current Pico RRU is acquired by converging of, a processed radio frequency signal received by the current Pico RRU, and radio frequency signals each received by a respective one of other Pico RRUs than the current Pico RRU in the plurality of Pico RRUs; calculating geographic location information of the target terminal device according to the converged signals each corresponding to a respective one of the plurality of Pico RRUs and geographic location information of at least three of the plurality of Pico RRUs; and sending positioning information of the target terminal device to a sender of the request for positioning, wherein, the positioning information comprises at least the geographic location information of the target terminal device; wherein calculating the geographic location information of the target terminal device according to the converged signals each corresponding to a respective one of the plurality of Pico RRUs and geographic location information of at least three of the plurality of Pico RRUs, comprises, for each converged signal corresponding to the current Pico RRU, decomposing a signal corresponding to the target terminal device from the converged signal corresponding to the current Pico RRU, and generating a value of a received signal strength, RSSI, of the current Pico RRU with respect to the target terminal device according to the signal corresponding to the target terminal device; selecting at least three Pico RRUs closest to the target terminal device according to the RSSI value, from the plurality of Pico RRUs; and calculating the geographic location information of the target terminal device according to the geographic location information of the selected Pico RRUs.