Indicating transmission timing changes

An apparatus comprising at least one processor, and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:

• transmit one or more first reference signals on one or more transmission occasions within a time window;
• receive one or more second reference signals;
• perform, based at least partly on the one or more second reference signals, one or more transmission timing changes on at least one of the one or more transmission occasions, on which the one or more first reference signals are transmitted;
• and
• transmit a message comprising at least a first vector, wherein the first vector comprises one or more values indicating the one or more transmission timing changes.

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.