Csi obtaining method, server, terminal, and ap

A server, comprising:

• a receiving module configured to receive a channel state information (CSI) obtaining request sent by a terminal, wherein the CSI obtaining request comprises an address of a first access point AP communicatively connected to the terminal and an address of the terminal;
• a processing module configured to determine at least one first measurement AP in first storage APs according to the address of the first AP, wherein the first storage APs are APs that are stored by the server and that can perform channel estimation on service data to obtain CSI, and the at least one first measurement AP is an AP within coverage corresponding to the address of the first AP;
• and
• a sending module configured to send a first CSI measurement request to the at least one first measurement AP determined by the processing module, wherein the first CSI measurement request comprises the address of the terminal, so that the at least one first measurement AP listens to, according to the address of the terminal, first service data sent by the terminal, wherein
• the receiving module is further configured to receive first measurement data, wherein the first measurement data comprises first CSI, the first CSI is obtained after a target measurement AP performs channel estimation on the first service data obtained by means of listening, and the target measurement AP is an AP that obtains the first service data by means of listening in the at least one first measurement AP;
• and
• the sending module is further configured to send the first measurement data or a first processing result to the terminal, wherein the first processing result is obtained by using the first measurement data.