Method, apparatus and system for determining a position of a wireless device

A method performed by a positioning node for determining a position of a wireless device in a wireless communication network, the method comprising:

• obtaining a first sequence of Time Difference of Arrivals (TDOAs) at the wireless device of reference signals, which are transmitted by and used for synchronization of a first pair of network nodes;
• determining a first base offset and a first delay in response associated with the first sequence of TDOAs;
• determining a first relative distance d2u−d1u based on the first base offset and the first delay in response if the first delay in response is more than zero, wherein the first relative distance d2u−d1u is a difference between distances from the wireless device to each network node in the first pair;
• obtaining a second sequence of TDOAs at the wireless device of reference signals, which are transmitted by and used for synchronization of a second pair of network nodes;
• determining a second base offset and a second delay in response associated with the second sequence of TDOAs;
• determining a second relative distance d4u−d3u based on the second base offset and the second delay in response if the second delay in response is more than zero, wherein the second relative distance d4u−d3u is a difference between distances from the wireless device to each network node in the second pair;
• and
• determining the position of the wireless device based on the first and second relative distances d2u−d1u, d4u−d3u.