Methods and Arrangements for High Accuracy Positioning

A method in a positioning server for positioning of a communication device, the positioning server being configured to communicate with a plurality of positioning nodes, the method comprising:

• receiving radio channel information of said communication device,
• sending said received radio channel information of the communication device to said plurality of positioning nodes,
• receiving from one or more of said plurality of positioning nodes signal strength information of a signal transmitted by the communication device, where the signal strength information refers to the strength of said signal as received by said one or more of said plurality of positioning nodes, respectively, by using said radio channel information,
• obtaining information about one or more positions at Which the signal was received of said one or more of said plurality of positioning nodes, and determining the position of the communication device based on the received signal strength information and the obtained positioning information of said one or more of said plurality of positioning nodes.

A positioning node for providing positioning information of a communication device to a positioning server in a positioning system, the positioning node comprising:

• a communication unit configured to receive radio channel information for the communication device from the positioning server,
• a radio frequency unit configured to receive radio signals, and
• a processor that is configured to identify a radio signal from the communication device out of the received radio signals, and to measure a signal strength of said identified radio signal,
• wherein the communication unit further is configured to send information of said measured signal strength to the positioning server, enabling the positioning server to determine a position of the communication device.