Abstract: Disclosed are a multi-antenna transmission method, a terminal and a base station, wherein, an eNB sends a UE a SRS transmission mode including new SRS transmission port information and/or a signaling for instructing the UE to perform antenna group alternate transmission as well as a control signaling required by the SRS transmission mode; the UE transmits a SRS using the abovementioned SRS transmission mode, and the eNB estimates a channel information according to the SRS and calculates and transmits a precoding matrix.

Abstract: A method and apparatus for configuring downlink power parameters are disclosed. The method includes: a base station configuring downlink power parameters for both a primary cell and a coordinated cell of a terminal in a Coordinated Multi-Point (CoMP) set in which the terminal is located; and the base station notifying the terminal of the downlink power parameters.

Abstract: A method and device for multi-access point calibration are disclosed. The method includes: a base station estimating a value closest to a true parameter deviation in a value interval of an uplink and downlink channel parameter deviation between access points, wherein the parameter deviation includes a phase difference and an amplitude difference; and the base station performing phase and/or amplitude calibration on service data transmitted jointly by the access points according to the value. With the method and device provided in the present document, a cell calculates a parameter difference between different access points, and then calibrates multiple access points according to the parameter difference, so as to solve a problem that the phase difference and amplitude difference exist between the data transmitted jointly between the multiple access points, and thus it can be guaranteed that good coherent transmission is performed between the access points, thereby improving the system performance.

Abstract: A method and a base station for calibrating data transmitted by coordinated APs are disclosed. The method includes: a base station obtaining an uplink channel frequency-domain response and a downlink channel frequency-domain response between a first AP and a second AP which participate in coordination; the base station dividing the uplink channel frequency-domain response by the downlink channel frequency-domain response to obtain an uplink and downlink channel response difference between the first AP and the second AP; and the base station calibrating the data transmitted by the first AP and the second AP in coordination according to the uplink and downlink channel response difference. The method and base station in the embodiments of the present document are applied to calibrate the data transmitted by coordinated APs.

Abstract: The embodiment of the present invention discloses a method, a system and an apparatus for calibrating deviation among multiple access points, which are used for solving a problem that information received by a user equipment (UE) is not synchronous, caused when different access points send data to the UE at the same time, and improving system performance and frequency spectrum efficiency. The method for calibrating deviation among multiple access points comprises the following steps: in step A: a base station sending to a UE a message instructing the UE to perform measurement and return deviation calibration information among the multiple access points (S101); and in step B: the base station calibrating the deviation among the multiple access points based on the deviation calibration information among the multiple access points returned by the UE (S102).