Positioning a terminal device
A method including receiving a first reference signal, wherein the first reference signal is having a first bandwidth in a first frequency range, determining an angle of arrival of a line of sight component of the first reference signal, receiving a second reference signal, wherein the second reference signal is having a second bandwidth in a second frequency range, wherein the second bandwidth is greater than the first bandwidth, determining a time of arrival of a line of sight component of the second reference signal, based on the first reference signal and on the second reference signal, determining a link quality measure, and based on the link quality measure, the time of arrival and the angle of arrival, performing a position estimation to obtain an estimated position, wherein the first reference signal and the second reference signal are received from a same transmit-receive point.
1 . An apparatus comprising:
at least one processor, and
at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus to:
receive a first reference signal, wherein the first reference signal is having a first bandwidth in a first frequency range;
determine an angle of arrival of a line of sight component of the first reference signal;
receive a second reference signal, wherein the second reference signal is having a second bandwidth in a second frequency range;
determine a time of arrival of a line of sight component of the second reference signal;
based on the first reference signal and on the second reference signal, determine a link quality measure; and
based on the link quality measure, the time of arrival and the angle of arrival, perform a position estimation to obtain an estimated position,
wherein the first reference signal and the second reference signal are received from a same transmit-receive point; and
wherein the instructions, when executed with the at least one processor, cause the apparatus to align the angle of arrival with a global coordinate system.
2 . The apparatus of claim 1 , wherein the instructions, when executed with the at least one processor, cause the apparatus to estimate, based on the first reference signal, a first channel metric with a first precision, and, based on the first channel metric and the first reference signal, select a delay range.
3 . The apparatus of claim 2 , wherein the instructions, when executed with the at least one processor, cause the apparatus to, based on the second reference signal and the delay range, estimate a second channel metric with a second precision.
4 . The apparatus of claim 3 , wherein the time of arrival of a line of sight component of the second reference signal is determined based on the second channel metric.
5 . An apparatus according to claim 1 , wherein the instructions, when executed with the at least one processor, cause the apparatus to obtain, based on the first channel metric, power and delay of each detected channel tap.
6 . An apparatus according to claim 1 , wherein the selecting of the delay range comprises determining a set of relevant delays and, using the first reference signal and using the set of relevant delays, updating the boundaries of the delay range.
7 . An apparatus according to claim 1 , wherein the estimated position is associated with a trust level.
8 . An apparatus according to claim 7 , wherein the trust level comprises a position variance.
9 . An apparatus according to claim 1 , wherein the first reference signal is a first positioning reference signal and/or the second reference signal is a second positioning reference signal.
10 . An apparatus according to claim 1 , wherein the link quality measure is a link quality measure determined for both, the first and the second, bandwidths.
11 . An apparatus according to claim 1 , wherein the link quality measure is one of the following: a signal to noise ratio, a signal to interference and noise ratio, reference signal received power or reference signal received quality.
12 . A method comprising:
receiving a first reference signal, wherein the first reference signal is having a first bandwidth in a first frequency range;
determining an angle of arrival of a line of sight component of the first reference signal;
receiving a second reference signal, wherein the second reference signal is having a second bandwidth in a second frequency range;
determining a time of arrival of a line of sight component of the second reference signal;
based on the first reference signal and on the second reference signal, determining a link quality measure;
based on the link quality measure, the time of arrival and the angle of arrival, performing a position estimation to obtain an estimated position,
wherein the first reference signal and the second reference signal are received from a same transmit-receive point; and
aligning the angle of arrival with a global coordinate system.
13 . A non-transitory program storage device readable by an apparatus, tangibly embodying a computer program product comprising instructions for causing an apparatus to perform at least the following:
receive a first reference signal, wherein the first reference signal is having a first bandwidth in a first frequency range;
determine an angle of arrival of a line of sight component of the first reference signal;
receive a second reference signal, wherein the second reference signal is having a second bandwidth in a second frequency range;
determine a time of arrival of a line of sight component of the second reference signal;
based on the first reference signal and on the second reference signal, determine a link quality measure;
based on the link quality measure, the time of arrival and the angle of arrival, perform a position estimation to obtain an estimated position,
wherein the first reference signal and the second reference signal are received from a same transmit-receive point; and
align the angle of arrival with a global coordinate system.