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 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 by the server to the terminal, wherein the first processing result is obtained by using the first measurement data.

A terminal, comprising:

• a sending module configured to send a channel state information (CSI) obtaining request to a server, wherein the CSI obtaining request comprises an address of a first AP communicatively connected to the terminal and an address of the terminal;
• a receiving module configured to receive first measurement data or a first processing result sent by the server, wherein the first processing result is obtained by using the first measurement data, and the first measurement data comprises first CSI;
• and
• a processing module configured to:
• obtain a union set of an address of the second storage AP and an address of the at least one first measurement AP to obtain an address of a second measurement AP, wherein the second storage AP is an AP that is stored by the terminal and that is communicatively connected to the terminal, and the address of the at least one first measurement AP is from the server;
• listen to, according to the address of the second measurement AP, third service data sent by an AP in the second measurement AP;
• and
• when the third service data is received, perform channel estimation on the third service data to obtain third CSI.