Method for determining a position of NLoS Tx UE
One embodiment is a method including: receiving signals of at least 4 paths from the Tx UE; measuring a ToA, an AoA, an AoD of each of the signals of 4 paths, determining each distance between the Rx UE and each scatter of each 4 paths, each distance between the Rx UE and the Tx UE and a driving direction of the Tx UE, based on the ToA, AoA and AoD; determining a position of the Tx UE based on results of measurement and results of the determination, wherein an assumption that each of x-axis distance and y-axis distance between the Tx UE and Rx UE based on the AoA, AoD and the driving direction of the Tx UE are identical in signal path 1 and signal path p (p=2, 3, 4) is used for determination of the position.
1. A method for determining a position of Tx user equipment (UE) by a Rx UE in a wireless communication system, the method comprising:
receiving, by the Rx UE, signals of at least 4 paths from the Tx UE;
measuring, by the Rx UE, a time of arrival (ToA), an angle of arrival (AoA), an angle of departure (AoD) of each of the signals of 4 paths,
determining, by the Rx UE, each distance between the Rx UE and each scatter of each 4 paths, each distance between the Rx UE and the Tx UE and a driving direction of the Tx UE, based on the ToA, AoA and AoD;
determining, by the Rx UE, a position of the Tx UE based on results of measurement and results of the determination,
wherein an assumption that each of x-axis distance and y-axis distance between the Tx UE and the Rx UE based on the AoA, AoD and the driving direction of the Tx UE are identical in signal path 1 and signal path p (p=2, 3, 4) is used for determination of the position.
2. The method of claim 1 , wherein a distance between the Rx UE and the Tx UE in signal path p is summation of a distance between the Rx UE and the Tx UE in signal path 1 and a distance based on time difference of arrival (TDoA).
3. The method of claim 1 , wherein each of the signals of at least 4 paths was reflected only once due to each scatter of each 4 paths.
4. The method of claim 1 , wherein the x-axis corresponds to a driving direction of the Rx UE and a position of the Rx UE is an origin of a coordinate.
5. The method of claim 4 , wherein the position of the Tx UE corresponds to a location in the coordinate.
6. The method of claim 1 , wherein the signals of at least 4 paths are orthogonal each other.
7. The method of claim 1 , wherein the Tx UE is a hidden vehicle in None line of sight (NLoS) of the Rx UE.
8. The method of claim 1 , wherein the ToA is measured by using a matched filtered.
9. The method of claim 1 , wherein the AoA and the AoD are measured by using a 2D multiple signal classification (MUSIC) algorithm.
10. The method of claim 1 , wherein the values of the AoA, the AoD, and the ToA are assumed to be constants during a sensing period.
11. The method of claim 1 , wherein assumption is expressed in following equation,
{
x
p
=
v
p
cos
(
θ
p
)
-
(
d
p
-
v
p
)
cos
(
φ
p
+
ω
)
=
v
1
cos
(
θ
1
)
-
(
d
1
-
v
1
)
cos
(
φ
1
+
ω
)
,
y
p
=
v
p
sin
(
θ
p
)
-
(
d
p
-
v
p
)
sin
(
φ
p
+
ω
)
=
v
1
sin
(
θ
1
)
-
(
d
1
-
v
1
)
sin
(
φ
1
+
ω
)
,
p
∈
𝒫
.
wherein p is path, θ p is the AoA, φ p is the AoD, υ p is propagation distances between the Tx UE and the scatter of path p, d p is a propagation distances between the Tx UE and the Rx UE, ω is the driving direction of the Tx UE.
12. A Rx user equipment (UE) for determining a position of Tx UE in a wireless communication system, the Rx UE comprising:
a memory; and
a processor coupled with the memory,
wherein the processor is configured to receive signals of at least 4 paths from the Tx UE, to measure a time of arrival (ToA), an angle of arrival (AoA), an angle of departure (AoD) of each of the signals of 4 paths, to determine each distance between the Rx UE and each scatter of each 4 paths, each distance between the Rx UE and the Tx UE and a driving direction of the Tx UE, based on the ToA, AoA and AoD and to determine a position of the Tx UE based on results of measurement and results of the determination,
wherein an assumption that each of x-axis distance and y-axis distance between the Tx UE and Rx UE based on the AoA, AoD and the driving direction of the Tx UE are identical in signal path 1 and signal path p (p=2, 3, 4) is used for determination of the position.
13. The Rx UE of claim 12 , wherein a distance between the Rx UE and the Tx UE in signal path p is summation of a distance between the Rx UE and the Tx UE in signal path 1 and a distance based on time difference of arrival (TDoA).
14. The Rx UE of claim 12 , wherein the RX UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, the BS or a network.