Patent ID: 8838141

Claim:
A method in a first network node, for assisting in positioning of a user equipment based on time measurements, the first network node being comprised in a wireless Long Term Evolution communications network “LTE network”, the method comprising: obtaining a positioning neighbor list of neighbor cells associated with a serving area of the first network node, the positioning neighbor list comprises a special-purpose cell “s-cell”, the s-cell is associated with a signalling device, the s-cell being recognized by the first network node as having limited functionality and is therefore not considerable for the user equipment as a candidate cell for serving the user equipment for data transmission; transmitting the positioning neighbor list or information necessary for the user equipment to find out the list of neighbor cells to be measured by the user equipment; the positioning neighbor list or the information enables the user equipment to find the s-cell and to perform time measurement on reference signals transmitted by the associated signalling device; obtaining from the user equipment a measurement report or a positioning estimate of the user equipment, the measurement report or positioning estimate is based on the time measurement performed by the user equipment on the reference signals transmitted by the signalling device; and transmitting to the user equipment, information about the frequency and timing that the signalling device uses for transmitting the reference signals, the frequency and timing information enables the user equipment to perform time measurement on the reference signals when the signalling device is part of a multi carrier network; wherein a coverage area of the s-cell overlaps a portion of the serving area of the first network node and a portion of a serving area of a second network node corresponding to one of the neighbor cells in the neighbor list, the serving areas of the first network node and the second network node being considerable as candidate cells for serving the user equipment for data transmission.