Timing measurement procedure under SRS antenna port switching

1 . A method of operating a wireless device that is configured to perform a timing measurement procedure that involves transmission of a reference signal during a timing measurement period, the method comprising:

determining that the wireless device is configured for antenna port switching of an antenna port configuration for transmitting the reference signal during the timing measurement period; and

in response to determining that the wireless device is configured for antenna port switching of the antenna port configuration for transmitting the reference signal during the timing measurement period, adapting a configuration for antenna port switching by wherein limiting the number of antenna port switching actions during the timing measurement period comprises limiting the number of antenna port switching actions during the timing measurement period to less than or equal to a maximum number of port switching actions.

2 . The method of claim 1 , wherein the wireless device is configured to switch from a first antenna port configuration for transmitting the reference signal to a second antenna port configuration for transmitting the reference signal during the timing measurement period.

3 . The method of claim 1 , wherein the maximum number of port switching actions is one.

4 . The method of claim 1 , wherein the maximum number of port switching actions is provided by a network node, is predefined, or is autonomously determined by the wireless device.

5 . The method of claim 1 , wherein adapting the configuration for antenna port switching comprises not performing antenna port switching during the timing measurement period.

6 . The method of claim 1 , wherein adapting the timing measurement procedure during the timing measurement period comprises discarding, stopping or abandoning the timing measurement procedure in response to a number of antenna port switching actions exceeding a threshold number of antenna port switching actions.

7 . The method of claim 1 , wherein adapting the timing measurement procedure during the timing measurement period comprises relaxing a measurement requirement for the timing measurement during the timing measurement period.

8 . The method of claim 7 , wherein adapting the timing measurement procedure during the timing measurement period comprises:

restarting the timing measurement procedure;

compensating timing measurements based on the antenna port switching;

extending the timing measurement period and/or;

performing timing measurements during the timing measurement period only based on reference signals transmitted using a single antenna port configuration.

9 . A method of operating a network node that serves a wireless device that is configured to transmit a reference signal during a timing measurement period, the method comprising:

determining that the wireless device is configured for antenna port switching of an antenna port configuration for transmitting the reference signal during the timing measurement period;

adapting a timing measurement procedure during the timing measurement period in response to determining that the wireless device is configured for antenna port switching of the antenna port configuration for transmitting the reference signal during the timing measurement period;

determining that the wireless device has performed a number of antenna port switching actions during the timing measurement period that is greater than a threshold number of antenna port switching actions; and

in response to determining that the wireless device has performed the number of antenna port switching actions during the timing measurement period that is greater than the threshold number of antenna port switching actions, stopping the timing measurement procedure.

10 . The method of claim 9 , further comprising transmitting information about the adaptation of the timing measurement procedure to another network node.

11 . The method of claim 9 , wherein adapting the timing measurement procedure comprises requesting the wireless device not to perform antenna port switching during the timing measurement period.

12 . The method of claim 9 , further comprising:

discarding timing measurement samples made during the timing measurement period.

13 . The method of claim 9 , further comprising:

restarting the timing measurement procedure after stopping the timing measurement procedure.