Realizing enterprise-grade localization using WiFi 802.11mc fine tune measurement
A method for assessing viability of a WiFi fine tune measurement (FTM) based ranging protocol for enterprise-grade localization with heterogeneity across operational parameters is presented. The method includes enabling a plurality of access points to range with a plurality mobile devices handled by a plurality of users within an enterprise environment, tracking a mobile device of the plurality of mobile devices using onboard sensors as the mobile device travels within the enterprise environment, measuring a plurality of ranges with at least three access points of the plurality of access points at various points along a trajectory, and combining information related to the plurality of ranges and the trajectory to predict a range offset of the mobile device such that the mobile device itself self-calibrates all its range offsets on-demand.
1 . A method for assessing viability of a WiFi fine tune measurement (FTM) based ranging protocol for enterprise-grade localization with heterogeneity across operational parameters, the method comprising:
enabling a plurality of access points to range with a plurality of mobile devices handled by a plurality of users within an enterprise environment;
tracking a mobile device of the plurality of mobile devices using onboard sensors as the mobile device travels within the enterprise environment;
measuring a plurality of ranges with at least three access points of the plurality of access points at various points along a trajectory; and
combining information related to the plurality of ranges and the trajectory to predict a range offset of the mobile device such that the mobile device itself self-calibrates all its range offsets on-demand, wherein the range offset is computed by using a quadratic solver and a new position in the trajectory is reached by solving:
(
x
AP
-
∑
i
=
1
T
d
i
cos
(
α
i
)
)
2
+
(
y
AP
-
∑
i
=
1
T
d
i
sin
(
α
i
)
)
2
=
R
p
-
δ
,
where α i is an angular displacement of the mobile device, d i is a distance traveled by the mobile device between time-intervals on the trajectory, (x AP , y AP ) is an initial position of an access point, R p is a range of the plurality of ranges, and δ is the range offset.
2 . The method of claim 1 , wherein the mobile device of the plurality of mobile devices performs FTM ranging at a plurality of time-intervals to measure the plurality of ranges.
3 . The method of claim 1 , wherein the range offset is given by:
δ
=
R
1
-
x
A
P
2
+
y
AP
2
,
where (x AP , y AP ) is an initial position of the access point and R 1 is a range when a user of the mobile device was at position (0,0).
4 . A system for assessing viability of a WiFi fine tune measurement (FTM) based ranging protocol for enterprise-grade localization with heterogeneity across operational parameters, the system comprising:
a plurality of access points ranging with a plurality of mobile devices handled by a plurality of users within an enterprise environment for:
tracking a mobile device of the plurality of mobile devices using onboard sensors as the mobile device travels within the enterprise environment;
measuring a plurality of ranges with at least three access points of the plurality of access points at various points along a trajectory; and
combining information related to the plurality of ranges and the trajectory to predict a range offset of the mobile device such that the mobile device itself self-calibrates all its range offsets on-demand, wherein the range offset is computed by using a quadratic solver and a new position in the trajectory is reached by solving:
(
x
AP
-
∑
i
=
1
T
d
i
cos
(
α
i
)
)
2
+
(
y
AP
-
∑
i
=
1
T
d
i
sin
(
α
i
)
)
2
=
R
p
-
δ
,
where α i is an angular displacement of the mobile device, d i is a distance traveled by the mobile device between time-intervals on the trajectory, (x AP , y AP ) is an initial position of an access point, R p is a range of the plurality of ranges, and δ is the range offset.
5 . The system of claim 4 , wherein the mobile device of the plurality of mobile devices performs FTM ranging at a plurality of time-intervals to measure the plurality of ranges.
6 . A method for assessing viability of a WiFi fine tune measurement (FTM) based ranging protocol for enterprise-grade localization with heterogeneity across operational parameters, the method comprising:
enabling a plurality of access points to range with a plurality of mobile devices handled by a plurality of users within an enterprise environment;
tracking a mobile device of the plurality of mobile devices using onboard sensors as the mobile device travels within the enterprise environment;
measuring a plurality of ranges with at least three access points of the plurality of access points at various points along a trajectory; and
combining information related to the plurality of ranges and the trajectory to predict a range offset of the mobile device such that the mobile device itself self-calibrates all its range offsets on-demand, wherein the range offset is computed by using a linear solver and a new position in the trajectory is reached by solving:
(
x
C
+
∑
i
=
1
T
d
i
cos
(
α
i
)
)
2
+
(
y
C
-
∑
i
=
1
T
d
i
sin
(
α
i
)
)
2
=
(
R
p
-
δ
)
2
,
where α i is an angular displacement of the mobile device, d i is a distance traveled by the mobile device between time-intervals on the trajectory, (x C , y C ) is an initial position of the mobile device, R p is a range of the plurality of ranges, and δ is the range offset.
7 . The method of claim 6 , wherein the mobile device of the plurality of mobile devices performs FTM ranging at a plurality of time-intervals to measure the plurality of ranges.
8 . The method of claim 6 , wherein the range offset is given by:
δ
=
R
1
-
x
AP
2
+
y
AP
2
,
where (x AP , y AP ) is an initial position of the access point and R 1 is a range when a user of the mobile device was at position (0,0).