RTT measurement procedure based on DL and UL reference signal relations
Methods and devices are disclosed wherein a network node is configured to communicate with at least one of a second network node and a wireless device (WD). A network node is configured to perform at least one round trip time, RTT, measurement over a measurement time, the measurement time being a function of at least an association between a first periodicity of a first reference signal and a second periodicity of a second reference signal, the first reference signal being received by the network node from a wireless device, WD, and the second reference signal being transmitted from the network node to the WD. A WD is configured to perform one or more operational tasks using the results of the at least one RTT measurement.
1 . A method implemented in a wireless device, WD, the method comprising:
performing at least one round trip time, RTT, measurement over a measurement time, T m , the measurement time being a function of at least an association between a first periodicity, T RS1 , of a first reference signal and a second periodicity, T RS2 , of a second reference signal, the first reference signal being transmitted from the WD to a network node and the second reference signal being received by the WD from the network node, the first reference signal being a sounding reference signal, SRS, the second reference signal being a positioning reference signal, PRS, the first periodicity being a periodicity of the SRS and the second periodicity being a periodicity of the PRS; and
using a result of the at least one RTT measurement for one or more operational tasks.
2 . The method of claim 1 , wherein the association between the first periodicity and the second periodicity comprises at least one relation associated with the first periodicity and the second periodicity.
3 . The method of claim 2 , wherein the at least one relation, includes a maximum of the first periodicity and the second periodicity.
4 . The method of claim 2 , wherein the at least one relation includes at least one of:
a minimum of the first periodicity and the second periodicity; and
a difference between the first periodicity and the second periodicity.
5 . The method of claim 2 , wherein the at least one relation includes at least one of:
a mean of at least the first periodicity and the second periodicity;
a least common multiple of at least the first periodicity and the second periodicity; and
a modulus operation comprising the first periodicity and the second periodicity.
6 . The method of claim 1 , wherein the measurement time is further the function of at least one of: a periodicity associated with an activity level of the WD, a measurement gap and a measurement gap periodicity.
7 . A method implemented in a network node, the method comprising:
performing at least one round trip time, RTT, measurement over a measurement time, the measurement time being a function of at least an association between a first periodicity of a first reference signal and a second periodicity of a second reference signal, the first reference signal being received by the network node from a wireless device, WD, and the second reference signal being transmitted from the network node to the WD, the first reference signal being a sounding reference signal, SRS, the second reference signal being a positioning reference signal, PRS, the first periodicity being a periodicity of the SRS and the second periodicity being a periodicity of the PRS; and
using the at least one RTT measurement for an operational task.
8 . The method of claim 7 , wherein the association between the first periodicity and the second periodicity comprises at least one relation associated with the first periodicity and the second periodicity.
9 . The method of claim 8 , wherein the at least one relation includes a maximum of the first periodicity and the second periodicity.
10 . The method of claim 8 , wherein the at least one relation depends on a condition.
11 . The method of claim 10 , wherein a first relation is used when the condition is met; otherwise, a second relation is used.
12 . The method of claim 7 , wherein the measurement time is further the function of at least one of a minimum duration for the measurement time and a scaling factor.
13 . The method of claim 12 , wherein the measurement time is a maximum of the association and the at least one of the minimum duration for the measurement time and the scaling factor.
14 . A wireless device, WD, configured to communicate with a network node, the WD comprising processing circuitry, the processing circuitry configured to cause the WD to:
perform at least one round trip time, RTT, measurement over a measurement time, T m , the measurement time being a function of at least an association between a first periodicity, T RS1 , of a first reference signal and a second periodicity, T RS2 , of a second reference signal, the first reference signal being transmitted from the WD to a network node and the second reference signal being received by the WD from the network node, the first reference signal being a sounding reference signal, SRS, the second reference signal being a positioning reference signal, PRS, the first periodicity being a periodicity of the SRS and the second periodicity being a periodicity of the PRS; and
use a result of the at least one RTT measurement for one or more operational tasks.
15 . The WD of claim 14 , wherein the measurement time is further the function of at least one of a minimum duration for the measurement time and a scaling factor.
16 . The WD of claim 15 , wherein the measurement time is a maximum of the association and the at least one of the minimum duration for the measurement time and the scaling factor.
17 . The WD of claim 14 , wherein the processing circuitry is configured to cause the WD to perform the at least one RTT measurement by being configured to cause the WD to perform multiple RTT measurements associated with multiple different nodes.
18 . The WD of claim 14 , wherein the one or more operational tasks comprising one or more of: reporting the results of the at least one RTT measurement to a network node, using the results of the at least one RTT measurement for positioning of the WD and using the results of the at least one RTT measurement for collecting performance statistics.
19 . A network node configured to communicate with a wireless device, WD, the network node comprising processing circuitry, the processing circuitry configured to cause the network node to:
perform at least one round trip time, RTT, measurement over a measurement time, the measurement time being a function of at least an association between a first periodicity of a first reference signal and a second periodicity of a second reference signal, the first reference signal being received by the network node from a wireless device, WD, and the second reference signal being transmitted from the network node to the WD, the first reference signal being a sounding reference signal, SRS, the second reference signal being a positioning reference signal, PRS, the first periodicity being a periodicity of the SRS and the second periodicity is a periodicity of the PRS; and
use the at least one RTT measurement for an operational task.
20 . The network node of claim 19 , wherein the processing circuitry is configured to cause the network node to perform the at least one RTT measurement by being configured to cause the network node to perform multiple RTT measurements associated with multiple different nodes.
21 . The network node of claim 19 , wherein the one or more operational tasks comprise one or more of: reporting the results of the at least one RTT measurement to another network node, using the results of the at least one RTT measurement for positioning of the WD and using the results of the at least one RTT measurement for collecting performance statistics.