Disclosed is a method comprising receiving one or more first reference signals; transmitting one or more second reference signals; receiving a message comprising at least a first vector, wherein the first vector comprises one or more values indicating one or more transmission timing changes associated with one or more transmission occasions of the one or more first reference signals within a time window; determining one or more positioning measurement values based at least partly on the one or more first reference signals and the message; determining time difference information between a reception time of the one or more first reference signals and a transmission time of the one or more second reference signals; and transmitting a report indicating the one or more positioning measurement values and the time difference information.