Patent ID: 8908586

Claim:
A method in a network node for scheduling the transmission of positioning subframes from different base stations in an unsynchronized wireless communications network, wherein subframe boundaries are unsynchronized across the different base stations in the network, the method comprising: selecting a time period during which transmission of positioning subframes is to occur from one or more of the different base stations in the unsynchronized wireless communications network, by selecting the time period such that data-free portions of different positioning subframes to be respectively transmitted from the different base stations are to at least partly overlap in time; informing one or more of the base stations that positioning subframes are to be transmitted during the selected time period; scheduling the transmission of a positioning subframe from the network node based on at least the selected time period, wherein the network node is one of the different base stations, wherein said scheduling comprises scheduling the transmission of a positioning subframe to occur during a time period which deviates from the selected time period, but the scheduled time period deviates from the selected time period by a non-zero amount that is less than half the length of a subframe; and transmitting the scheduled positioning subframe.