Indicating transmission timing changes

1 . 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:

receive one or more first reference signals;

transmit one or more second reference signals;

receive 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;

determine one or more positioning measurement values based at least partly on the one or more first reference signals and the message;

determine 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

transmit a report indicating the one or more positioning measurement values and the time difference information.

2 . The apparatus of claim 1 , wherein the message further comprises at least one of: a resource identifier associated with the one or more first reference signals, an identifier associated with the time window, and/or an identifier associated with a RxTx timing error group.

3 . The apparatus of claim 1 , wherein each of the one or more values is less than or equal to one,

wherein a first value of the one or more values indicates no transmission timing change compared to a first transmission occasion of the one or more first reference signals, and

wherein a second value of the one or more values indicates an amount of transmission timing change compared to the first transmission occasion of the one or more first reference signals.

4 . The apparatus of claim 3 , wherein the first value equals one, and wherein the second value is less than one.

5 . The apparatus of claim 1 , wherein the one or more positioning measurement values are determined by averaging a linear combination of a plurality of measurement samples associated with the one or more first reference signals based at least partly on the first vector.

6 . The apparatus of claim 5 , wherein a specific measurement sample of the plurality of measurement samples is excluded from the averaging, if a value of a transmission timing change corresponding with the specific measurement sample is less than one.

7 . The apparatus of claim 1 , wherein the apparatus is further caused to:

receive one or more third reference signals different to the one or more first reference signals,

wherein the message further includes at least a second vector,

wherein the second 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 third reference signals within the time window, and

wherein the one or more positioning measurement values comprise at least a reference signal time difference value, which is determined based at least partly on the first vector and the second vector.

8 . 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.

9 . The apparatus of claim 8 , wherein the message further comprises at least one of: a resource identifier associated with the one or more first reference signals, an identifier associated with the time window, and/or an identifier associated with a RxTx timing error group.

10 . The apparatus of claim 8 , wherein each of the one or more values is less than or equal to one,

wherein a first value of the one or more values indicates no transmission timing change compared to a first transmission occasion of the one or more first reference signals, and

wherein a second value of the one or more values indicates an amount of transmission timing change compared to the first transmission occasion of the one or more first reference signals.

11 . The apparatus of claim 8 , wherein the apparatus is further caused to:

determine the one or more values based at least partly on at least one threshold value.

12 . The apparatus of claim 11 , wherein at least one of the one or more values is determined to be equal to one, if an amount of at least one of the one or more transmission timing changes is less than the at least one threshold value.

13 . The apparatus of claim 11 , wherein at least one of the one or more values is determined to be equal to zero, if an amount of at least one of the one or more transmission timing changes is greater than or equal to the at least one threshold value.

14 . 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.