U.S. patent application number 14/938595 was filed with the patent office on 2017-05-11 for methods and systems for performing geofencing with reduced power consumption.
The applicant listed for this patent is Honeywell International Inc.. Invention is credited to Soumitri Kolavennu, Kevin L. Weirich.
Application Number | 20170134896 14/938595 |
Document ID | / |
Family ID | 57421617 |
Filed Date | 2017-05-11 |
United States Patent
Application |
20170134896 |
Kind Code |
A1 |
Kolavennu; Soumitri ; et
al. |
May 11, 2017 |
METHODS AND SYSTEMS FOR PERFORMING GEOFENCING WITH REDUCED POWER
CONSUMPTION
Abstract
A GPS capability of a mobile device may be turned on in order to
ascertain an updated current location and then be turned off.
Position relative to the geofence may be determined based on the
updated current location and a time to fence value that provides an
estimate of how soon an individual carrying the mobile device could
cross the geofence may be calculated. The GPS capability may be
kept turned off for a delay time period that is based at least in
part on the calculated time to fence value. After the delay time
period, the GPS capability of the mobile device may be turned back
on and the cycle of turning on the GPS, ascertaining an updated
current location and turning off the GPS may continue. An
indication of the position of the mobile device relative to the
geofence may be transmitted.
Inventors: |
Kolavennu; Soumitri;
(Blaine, MN) ; Weirich; Kevin L.; (Plymouth,
MN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Honeywell International Inc. |
Morris Plains |
NJ |
US |
|
|
Family ID: |
57421617 |
Appl. No.: |
14/938595 |
Filed: |
November 11, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 4/029 20180201;
Y02D 70/26 20180101; Y02D 70/164 20180101; H04W 64/00 20130101;
H04W 4/021 20130101; H04W 4/023 20130101; Y02D 30/70 20200801; H04W
52/0274 20130101; Y02D 70/142 20180101 |
International
Class: |
H04W 4/02 20060101
H04W004/02; H04W 52/02 20060101 H04W052/02; H04W 64/00 20060101
H04W064/00 |
Claims
1. A method of implementing geofencing using a mobile device having
a GPS capability, the mobile device configured to be operably
coupled to a building controller, the method comprising: setting a
geofence defining a region about a building; turning on the GPS
capability of the mobile device, ascertaining an updated current
location of the mobile device, and then turning off the GPS
capability; determining a position of the mobile device relative to
the geofence based on the updated current location; calculating a
TIME TO FENCE value, wherein the TIME TO FENCE value is an estimate
of a minimum length of time that it would take for an individual
carrying the mobile device to cross the geofence; calculating a
DELAY TIME value, where the DELAY TIME value is based at least in
part on the calculated TIME TO FENCE value and is less than the
TIME TO FENCE value; with the GPS capability turned off, waiting
THE DELAY TIME value and then: turning on the GPS capability of the
mobile device; ascertaining an updated current location of the
mobile device; turning off the GPS capability; repeating the
determining the position, calculating the TIME TO FENCE value,
calculating the DELAY TIME value, waiting the DELAY TIME value,
turning on the GPS capability, ascertaining an updated current
location, and turning off the GPS capability steps; and
communicating an indication of the position of the mobile device
relative to the geofence to a building controller so that the
building controller can regulate operation of a building system in
accordance with the indication of the position of the mobile device
relative to the geofence.
2. The method of claim 1, wherein the indication of the position of
the mobile device relative to the geofence is communicated to the
building controller when the updated current location of the mobile
device crosses the geofence, and the indication of the position of
the mobile device relative to the geofence indicates a geofence
crossing.
3. The method of claim 1, wherein the DELAY TIME value represents
an elapsed time that is about 80 percent or more of the calculated
TIME TO FENCE value.
4. The method of claim 1, wherein the DELAY TIME value represents
an elapsed time that is about 90 percent or more of the calculated
TIME TO FENCE value.
5. The method of claim 1, wherein turning on the GPS capability
further comprises checking a horizontal accuracy of the updated
current location.
6. The method of claim 5, further comprising keeping the GPS
capability on during the delay time period if the horizontal
accuracy of the updated current location is not above a
predetermined threshold.
7. The method of claim 1, wherein calculating the TIME TO FENCE
value comprises estimating a minimum length of time that it would
take for the individual carrying the mobile device to cross the
geofence when leaving the building.
8. The method of claim 1, wherein calculating the TIME TO FENCE
value comprises estimating a minimum length of time that it would
take for the individual carrying the mobile device to cross the
geofence when returning to the building.
9. The method of claim 1, wherein calculating the TIME TO FENCE
value comprises determining a straight line distance between the
updated current location of the individual carrying the mobile
device and the building and subtracting a radius defining the
geofence, and determining the TIME TO FENCE value based on a
predetermined maximum speed value.
10. The method of claim 1, wherein calculating the TIME TO FENCE
value comprises determining a driving route between the updated
current location of the individual carrying the mobile device and a
point on the geofence, and determining the TIME TO FENCE value
based on the driving route.
11. The method of claim 1, further comprising communicating the
TIME TO FENCE value to the building controller so that the building
controller can regulate operation of the building system in
accordance with the TIME TO FENCE value.
12. A mobile device having GPS, the mobile device comprising: a
user interface; a memory for storing an executable program, the
memory also storing information pertaining to a geofence assigned
to a building; a controller operably coupled to the user interface
and to the memory, the controller configured to temporarily turn on
the GPS in order to determine an updated current location of the
mobile device, and then turn the GPS off; the controller configured
to compare the updated current location of the mobile device to the
geofence and calculate a TIME TO FENCE value that indicates a
minimum amount of time before the mobile device could cross the
geofence; the controller configured to calculate a DELAY TIME value
that is based at least in part upon the calculated TIME TO FENCE
value; the controller configured to wait the DELAY TIME value
before temporarily turning the GPS on again to determine an updated
current location of the mobile device, and then turn the GPS off;
and the controller configured to cause the mobile device to
communicate an indication of the updated current location of the
mobile device relative to the geofence to a building controller so
that the building controller can regulate operation of a building
system in accordance with the indication of the position of the
mobile device relative to the geofence.
13. The mobile device of claim 12, wherein the controller is
configured to cause the mobile device to communicate the indication
of the updated current location of the mobile device relative to
the geofence to the building controller when the updated current
location of the mobile device crosses the geofence, and the
indication of the updated current location of the mobile device
relative to the geofence indicates a geofence crossing.
14. The mobile device of claim 12, wherein the DELAY TIME value is
non-linear with the calculated TIME TO FENCE value.
15. The mobile device of claim 12, wherein the controller is
configured to calculate the TIME TO FENCE value by estimating how
soon an individual carrying the mobile device could cross the
geofence when leaving the building.
16. The mobile device of claim 12, wherein the controller is
configured to calculate the TIME TO FENCE value by estimating how
soon an individual carrying the mobile device could cross the
geofence when returning to the building.
17. The mobile device of claim 12, wherein the controller is
configured to calculate the TIME TO FENCE value by determining a
straight line distance between the updated current location of the
mobile device and the building and subtracting a radius of the
geofence, and determining the TIME TO FENCE value based on a
predetermined maximum speed.
18. The mobile device of claim 12, wherein the controller is
further configured to calculate the TIME TO FENCE value by
determining a driving route between the updated current location of
the mobile device and a point on the geofence, and determining the
TIME TO FENCE value based on the driving route.
19. A mobile device comprising: a user interface; a memory for
storing an executable program, the memory also storing information
pertaining to a geofence assigned to a building; location services
including a cellular triangulation capability and a GPS capability;
a controller operably coupled to the user interface and to the
memory, the controller configured to turn on at least some of the
location services in order to determine an updated current location
of the mobile device and then turn off the location services that
had been turned on; the controller further configured to compare
the updated current location to the geofence and calculate a TIME
TO FENCE value, wherein the TIME TO FENCE value is an estimate of a
minimum time in which the mobile device could cross the geofence;
the controller further configured to calculate a DELAY TIME value
that is based at least in part on the calculated TIME TO FENCE
value and is less than the TIME TO FENCE value; the controller
further configured to wait the DELAY TIME value before turning on
the location services on again, and then turn off the location
services; and the controller further configured to cause the mobile
device to communicate an indication of the updated current location
of the mobile device relative to the geofence to a building
controller so that the building controller can regulate operation
of a building system in accordance with the indication of the
updated current location of the mobile device relative to the
geofence.
20. The mobile device of claim 19, wherein after waiting the DELAY
TIME VALUE, the controller is configured to: turn on the cellular
triangulation capability of the mobile device and not the GPS
capability if the calculated TIME TO FENCE value is greater than a
predetermined value; and turn on the GPS capability of the mobile
device if the calculated TIME TO FENCE value is less than the
predetermined value.
Description
TECHNICAL FIELD
[0001] The disclosure relates generally to geofencing, and more
particularly to methods and systems for achieving geofencing with
reduced power consumption.
BACKGROUND
[0002] A geofence typically represents a virtual perimeter around a
real-world geographic area, and the process of using a geofence is
often called geofencing. A geofence may be a radius or the like
around a building or other set location, or can be a predefined set
of boundaries like school attendance zones or neighborhood
boundaries. Geofencing can be used to identify when a tracked
object crosses into or out of a defined geofence. In some cases,
the location of the tracked object may be determined using location
services of a mobile device, such as a smartphone or other mobile
device. In some cases, the location services may include a cellular
triangulation capability and/or a GPS capability. Some example
geofence application may include notifying parents if their child
leaves a designated area, tracking when vehicles, employees, or
other assets enter or leave a designated area, enabling or
disabling certain geofence enabled equipment when the equipment
enters or leaves a designated area, etc.
[0003] Geofencing may also be used in conjunction with building
automation systems. Building automation systems are often used to
control safety, security and/or comfort levels within a building or
other structure. Illustrative but non-limiting examples of building
automation systems include Heating, Ventilation and/or Air
Conditioning (HVAC) systems, security systems, lighting systems,
fire suppression systems and/or the like. In some cases, a building
automation system may enter an unoccupied mode when the building is
expected to be unoccupied and an occupied mode when the building is
expected to be occupied. In one example, when the building
automation system includes an HVAC system, the building automation
system may set a temperature set point of the HVAC system to a more
energy efficient setting when in an unoccupied mode and a more
comfortable setting when in an occupied mode. In another example,
when the building automation system includes a security system, the
building automation system may set the security system to an armed
or away state when in an unoccupied mode and an unarmed or home
state when in an occupied mode. It is contemplated that geofencing
may be used to inform the building automation system as to when the
building is expected to be occupied and unoccupied, and the
building automation system may respond accordingly.
SUMMARY
[0004] The present disclosure pertains generally to geofencing, and
in some cases, to building automation systems with geofencing
capabilities. An example of the disclosure may be found in a method
of implementing geofencing using a mobile device having a GPS
capability and being configured to be operably coupled to a
building controller. A geofence defining a region about a building
may be set. The GPS capability of the mobile device may be turned
on in order to ascertain an updated current location of the mobile
device, and then be turned off to save power at the mobile device.
A position of the mobile device relative to the geofence may be
determined based on the updated current location and a time to
fence value that provides an estimate of how soon an individual
carrying the mobile device could cross the geofence may be
calculated. The GPS capability may be kept turned off for a delay
time period that is based at least in part on the calculated time
to fence value. After the delay time period, the GPS capability of
the mobile device may be turned back on and the cycle of turning on
the GPS, ascertaining an updated current location and turning off
the GPS may be repeated. An indication of the position of the
mobile device relative to the geofence may be transmitted.
[0005] Another example of the disclosure may be found in a mobile
device having GPS. The mobile device may include a user interface,
a memory and a controller that is operably coupled to the user
interface and to the memory. The memory may store an executable
program as well as information pertaining to a geofence assigned to
a building. The controller may be configured to temporarily turn on
the GPS in order to determine an updated current location of the
mobile device, and then turn the GPS off. The controller may
compare the updated current location of the mobile device to the
geofence and calculate a time to fence value that indicates a
minimum time in which the mobile device could cross the geofence.
The controller may wait a delay time period that is based at least
in part on the calculated time to fence value before temporarily
turning the GPS on again to determine an updated current location
of the mobile device, and then turn the GPS off. The controller may
cause the mobile device to transmit an indication of the updated
current location of the mobile device relative to the geofence.
[0006] Another example of the disclosure may be found in a mobile
device having location services including a cellular triangulation
capability and a GPS capability. The mobile device may include a
user interface, a memory and a controller that is operably coupled
to the user interface and to the memory. The memory may store an
executable program as well as information pertaining to a geofence
assigned to a building. The controller may be configured to turn on
at least some of the location services in order to determine an
updated current location of the mobile device. The controller may
compare the updated current location to the geofence and calculate
a time to fence value that indicates a minimum time in which the
mobile device could cross the geofence and may then wait a delay
time period that is based at least in part on the calculated time
to fence value before turning on the location services on again,
and then turn off the location services. The controller may cause
the mobile device to transmit an indication of the updated current
location of the mobile device relative to the geofence.
[0007] While these examples relate to an illustrative geofence
application for a building, it is contemplated that the principles
disclosed herein can be used in any suitable geofence application
including, but not limited to, notifying parents if their child
leaves a designated area, tracking when vehicles, employees, or
other assets enter or leave a designated area, enabling or
disabling certain geofence enabled equipment when the equipment
enters or leaves a designated area, etc.
[0008] The preceding summary is provided to facilitate an
understanding of some of the features of the present disclosure and
is not intended to be a full description. A full appreciation of
the disclosure can be gained by taking the entire specification,
claims, drawings, and abstract as a whole.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The disclosure may be more completely understood in
consideration of the following description of various illustrative
embodiments of the disclosure in connection with the accompanying
drawings, in which:
[0010] FIG. 1 is a schematic view of an illustrative building
automation system;
[0011] FIG. 2 is a schematic view of another illustrative building
automation system;
[0012] FIG. 3 is a schematic view of another illustrative building
automation system;
[0013] FIG. 4 is a schematic view of an illustrative mobile
device;
[0014] FIG. 5 is a schematic view of another illustrative mobile
device; and
[0015] FIGS. 6 through 8 are flow diagrams showing illustrative
methods that may be carried out in accordance with embodiments of
the disclosure.
[0016] While the disclosure is amenable to various modifications
and alternative forms, specifics thereof have been shown by way of
example in the drawings and will be described in detail. It should
be understood, however, that the intention is not to limit aspects
of the disclosure to the particular illustrative embodiments
described. On the contrary, the intention is to cover all
modifications, equivalents, and alternatives falling within the
spirit and scope of the disclosure.
DESCRIPTION
[0017] The following description should be read with reference to
the drawings wherein like reference numerals indicate like
elements. The drawings, which are not necessarily to scale, are not
intended to limit the scope of the disclosure. In some of the
figures, elements not believed necessary to an understanding of
relationships among illustrated components may have been omitted
for clarity.
[0018] All numbers are herein assumed to be modified by the term
"about", unless the content clearly dictates otherwise. The
recitation of numerical ranges by endpoints includes all numbers
subsumed within that range (e.g., 1 to 5 includes 1, 1.5, 2, 2.75,
3, 3.80, 4, and 5).
[0019] As used in this specification and the appended claims, the
singular forms "a", "an", and "the" include the plural referents
unless the content clearly dictates otherwise. As used in this
specification and the appended claims, the term "or" is generally
employed in its sense including "and/or" unless the content clearly
dictates otherwise.
[0020] It is noted that references in the specification to "an
embodiment", "some embodiments", "other embodiments", etc.,
indicate that the embodiment described may include a particular
feature, structure, or characteristic, but every embodiment may not
necessarily include the particular feature, structure, or
characteristic. Moreover, such phrases are not necessarily
referring to the same embodiment. Further, when a particular
feature, structure, or characteristic is described in connection
with an embodiment, it is contemplated that the feature, structure,
or characteristic may be applied to other embodiments whether or
not explicitly described unless clearly stated to the contrary.
[0021] The present disclosure is directed generally at building
automation systems. Building automation systems are systems that
control one or more operations of a building. Building automation
systems can include HVAC systems, security systems, fire
suppression systems, energy management systems and/or any other
suitable systems. While HVAC systems are used as an example below,
it should be recognized that the concepts disclosed herein can be
applied to building control systems more generally.
[0022] A building automation system may include a controller,
computer and/or other processing equipment that is configured to
control one or more features, functions, systems or sub-systems of
a building. In some cases, devices that can be used by individuals
to communicate with the controller, computer and/or other
processing equipment. In some cases, a building automation system
may include a plurality of components that, in combination, perform
or otherwise provide the functionality of the building automation
system. A building automation system may be fully contained within
a single building, or may include components that are spread
between multiple housings and/or across multiple locations. In some
embodiments, a building automation system, regardless of the
physical location(s) of the components within the building
automation system, may control one or more building systems within
a single building. In some cases, a building automation system,
regardless of the physical location(s) of the components within the
building automation system, may control one or more building
systems within a plurality of buildings, optionally in accordance
with a common operating procedure and/or distinct operating
procedures for each building as desired.
[0023] FIG. 1 is a schematic view of an illustrative building
automation system 10. The illustrative building automation system
10 includes a server 12 that may be configured to communicate with
a mobile device 14 and with a building controller 16. It will be
appreciated that for simplicity, only a single mobile device 14 is
shown, while in many cases the server 12 may be configured to
communicate directly or indirectly with any number of mobile
devices 14. Similarly, while a single building controller 16 is
illustrated, in many cases the server 12 may be configured to
communicate directly or indirectly with any number of building
controllers 16, located in a single building or distributed
throughout a plurality of buildings. The server 12 is illustrated
as a single, cloud-based server. In some cases, the server 12 may
be a single server. In some instances, the server 12 may
generically represent two, three or more servers commonly located
or spread between two or more physical locations. In some cases,
the server 12 handles communication with both the mobile device 14
and the building controller 16. In some instances, as shown for
example in FIG. 2, distinct servers may carry out each
communications protocol if desired.
[0024] In some cases, the mobile devices 14 may communicate with
the server 12 at least partially through a network such as the
Internet, sometimes using a cell phone network, WiFi network and/or
any other suitable network. Likewise, it is contemplated that the
building controller 16 may communicate with the server 12 at least
partially through a network such as the Internet, sometimes using a
cell phone network, WiFi network and/or any other suitable
network.
[0025] FIG. 2 is a schematic illustration of another illustrative
building automation system 20. The illustrative building automation
system 20 includes a first server 22 that may be configured to
communicate with a mobile device 14 (or multiple mobile devices 14)
and a second server 24 that may be configured to communicate with a
building controller 16 (or multiple building controllers 16). The
first server 22 may be configured to receive data from the mobile
device 14, process the data, and send data to the mobile device 14
and/or to the second server 24. The second server 24 may be
configured to receive data from the building controller 16, process
the data, and send data to the building controller 16 and/or to the
first server 22. In some instances, the first server 22 may be
configured to permit data from the mobile device 14 to pass
directly through to the building controller 16. In some cases, the
second server 24 may be configured to permit data from the building
controller 16 to pass directly through to the mobile device 14. The
first server 22 and the second server 24 may be configured to
communicate with each other. In some cases, each of the first
server 22 and the second server 24 may perform a defined
function.
[0026] It will be appreciated that for simplicity, only a single
mobile device 14 is shown, while in many cases the first server 22
may be configured to communicate directly or indirectly with any
number of mobile devices 14. Similarly, while a single building
controller 16 is illustrated, in many cases the second server 24
may be configured to communicate directly or indirectly with any
number of building controllers 16, located in a single building or
distributed throughout a plurality of buildings.
[0027] The first server 22 is illustrated as a single, cloud-based
server. In some cases, the first server 22 may be a single server.
In some instances, the first server 22 may generically represent
two, three or more servers commonly located or spread between two
or more physical locations. The second server 24 is illustrated as
a single, cloud-based server. In some cases, the second server 24
may be a single server. In some instances, the second server 24 may
generically represent two, three or more servers commonly located
or spread between two or more physical locations. In some cases,
the first server 22 and the second server 24 may, in combination,
be considered as representing or forming a building automation
server 26.
[0028] FIG. 3 is a schematic illustration of a building automation
system 30 in which a building automation server 26 is configured to
communicate with a plurality of buildings 32 as well as a plurality
of mobile devices 34. It is contemplated that the building
automation server 26 may include a single server or two or more
distinct servers at one or several locations. The building
automation system 30 may serve any desired number of buildings. As
illustrated, the plurality of buildings 32 includes a Building One,
labeled as 32A, a Building Two, labeled as 32B, and so on through a
Building "N", labeled as 32N. It will be appreciated that the
building automation system 30 may include a large number of
buildings, each in communication with a central (or distributed)
building automation server 26. In some cases, each building may be
associated with a unique customer account, as further described
below.
[0029] As illustrated, each of the plurality of buildings 32
includes a building controller and one or more pieces of building
equipment. The building equipment may, for example, be HVAC
equipment, security equipment, lighting equipment, fire suppression
equipment, and/or the like. In particular, the building 32A
includes a building controller 36A and building equipment 38A, the
building 32B includes a building controller 36B and building
equipment 38B, and so on through the building 32N, which includes a
building controller 36N and building equipment 38N. It will be
appreciated that while each building is illustrated as having a
single building controller and single building equipment controlled
by the single building controller, in some cases a building may
have multiple related or unrelated building controllers and/or
multiple pieces of related or unrelated building equipment.
[0030] The plurality of mobile devices 34 may be considered as
being divided into a set of mobile devices each associated with a
corresponding building. In the example shown, the plurality of
mobile devices 34 may be considered as being divided into a set of
mobile devices 40A that are associated with the building 32A, a set
of mobile devices 40B that are associated with the building 32B,
and so on through a set of mobile devices 40N that are associated
with the building 32N. As illustrated, the set of mobile devices
40A includes a first mobile device 42A, a second mobile device 44A
and a third mobile device 46A. The set of mobile devices 40B
includes a first mobile device 42B, a second mobile device 44B and
a third mobile device 46B and so on through the set of mobile
devices 40N, which includes a first mobile device 42N, a second
mobile device 44N and a third mobile device 46N. This is merely
illustrative, as any number of mobile devices such as smart phones
or tablets, may be associated with a particular building, as
desired. Each user or occupant of a building may have an associated
mobile device, or may have several associated mobile devices. In
some cases, a user or occupant may have a mobile device associated
with several different locations such as a home, a cabin or a place
of work.
[0031] Associating a mobile device with a particular building
generally involves the individual who uses the particular mobile
device. In the example shown in FIG. 3, a mobile device can
communicate with the building automation server 26, and may cause
the building automation server 26 to provide instructions to the
building controller that is associated with the particular mobile
device. For example, and in some instances, a mobile phone with
location services activated can be used to inform the building
automation server 26 as to the whereabouts of the user relative to
a geofence defined for the associated building, and in some cases
an estimate of how long before the user will arrive at the
associated building. The building automation server 26 may send a
command to the building controller of the associated building to
operate the building equipment in an energy savings manner when all
of the users that are associated with a particular building are
determined to be away from the building (e.g. the building is
unoccupied). The building automation server 26 may send a command
to the building controller of the associated building to operate
the building equipment in a comfort mode when all of the users that
are associated with a particular building are determined or deemed
not to be away from the building (e.g. the building is
occupied).
[0032] The mobile device need not be a smart phone or tablet.
Instead, the mobile device may be any GPS enabled tag or module
that can be fixed to a person (e.g. building occupant, child,
employee) or thing (e.g. car, truck, other equipment). Moreover,
while much of the present disclosure relates to an illustrative
geofence application for a building, it is contemplated that the
principles disclosed herein can be used in any suitable geofence
application including, but not limited to, notifying parents if
their child leaves a designated area, tracking when vehicles,
employees, or other assets enter or leave a designated area,
enabling or disabling certain geofence enabled equipment when the
equipment enters or leaves a designated area, etc.
[0033] FIG. 4 is a schematic illustration of an illustrative mobile
device 50 having GPS capability, schematically illustrated as GPS
52. In some instances, the mobile device 50 may be considered as
being an example of the mobile device 14 shown in FIGS. 1 and 2.
The mobile device 50 has a user interface 54, a memory 56 and a
controller 58 that is operably coupled to the user interface 54 and
to the memory 56. The controller 58 may be considered as being
operably coupled with the GPS 52 as well. The memory 56 may be
configured to store an executable program as well as information
pertaining to a geofence that is assigned to a building. The
controller 58 may be configured to temporarily turn on the GPS 52
in order to determine an updated current location of the mobile
device 50 prior to turning the GPS 52 back off in order to reduce
power consumption.
[0034] In some cases, the controller 58 may be configured to
compare the updated current location of the mobile device 50 to the
geofence and calculate a time to fence value that indicates a
minimum time in which the mobile device 50 could cross the
geofence. The time to fence value may be calculated in any of a
variety of manners. In some instances, the controller 58 may
calculate the time to fence value by estimating how soon an
individual carrying the mobile device 50 could cross the geofence
when leaving the building. The controller 58 may calculate the time
to fence value by estimating how soon an individual carrying the
mobile device 50 could cross the geofence when returning to the
building.
[0035] The controller 58 may, for example, calculate the time to
fence value by determining a straight line distance between the
updated current location of the mobile device 50 and the building
and subtracting a radius of the geofence, and determining the time
to fence value based on a predetermined maximum speed that the user
carrying the mobile device 50 may travel (e.g. 80 mph). In some
instances, the controller 58 may calculate the time to fence value
by determining a driving route between the updated current location
of the mobile device 50 and a point on the geofence along the
driving route, and determining the time to fence value based on the
driving route. In some cases, the time to fence value calculations
may take current traffic and/or road conditions into account, and
in some cases, speed limits along the driving route. In some
instances, the controller 58 may be configured to wait a delay time
period that is based at least in part on the calculated time to
fence value before temporarily turning the GPS 52 on again to
determine an updated current location of the mobile device 50, and
then turn the GPS 52 off. In some cases, the delay time period is
linear with the calculated time to fence value, and represents a
particular fraction or percent thereof. For example, in some cases
the delay time period may be about 80 percent of the calculated
time to fence value, or perhaps about 90 percent of the calculated
time to fence value. In some cases, the delay time period may be
non-linear with the calculated time to fence value. For example,
the delay time period may be the calculated time to fence value
less a predetermined time. In some cases, the delay time period
may, for example, be ten minutes less than the calculated time to
fence value is one hour or less. The delay time period may be five
minutes less than the calculated time to fence value if the
calculated time to fence value is more than one hour. These
numerical examples are merely illustrative.
[0036] In some cases, the controller 58 may be configured to
calculate a horizontal dilution of precision (HDOP) value for the
current location indicated by the GPS 52. The HDOP provides an
indication of the accuracy of the current GPS reading. For example,
if the GPS 52 has locked onto many GPS satellites, the HDOP may be
higher (more accuracy) that if the GPS 52 has only locked onto a
few GPS satellites. In another example, the GPS 52 may have a lower
HDOP (less accuracy) if the GPS 52 is inside of a building than of
the GPS 52 were outside.
[0037] In some cases, if the HDOP of the current GPS reading is not
very high (lower accuracy), the controller 58 may keep the GPS 52
turned on during the delay time period. If the HDOP improves to a
level at or above a predetermined HDOP accuracy threshold, the
controller 58 may turn the GPS 52 off during the next delay time
period. If the HDOP does not improve, or does not improve
sufficiently to reach the predetermined HDOP accuracy threshold,
the controller 58 may make the determination that the mobile device
50 is currently in a region with poor GPS service.
[0038] In some cases, if the mobile device 50 is determined to be
in a region with poor GPS service, the delay time period may be
shortened relative to the calculated time to fence value.
Conversely, if the HDOP indicates that the mobile device 50 is in a
region with good GPS service, the delay time period may be
lengthened relative to the calculated time to fence value in order
to further conserve energy at the mobile device 50.
[0039] In some cases, the controller 58 may be configured to cause
the mobile device 50 to transmit an indication of the updated
current location of the mobile device 50 relative to the geofence.
In some cases, the controller 58 may be configured to cause the
mobile device 50 to transmit an indication of the updated current
location of the mobile device 50 relative to the geofence each time
the location is checked and/or changed. In some instances, the
controller 58 may be configured to cause the mobile device 50 to
transmit the indication of the updated current location of the
mobile device 50 relative to the geofence when the updated current
location of the mobile device 50 indicates a geofence crossing.
[0040] FIG. 5 is a schematic illustration of an illustrative mobile
device 60 having location services including GPS capability,
schematically illustrated as GPS 62, and cellular triangulation
capability, schematically illustrated as cellular triangulation 64.
In some instances, the mobile device 60 may be considered as being
an example of the mobile device 14 shown in FIGS. 1 and 2. The
illustrative mobile device 60 has a user interface 66, a memory 68,
and a controller 70 that is operably coupled to the user interface
66 and to the memory 68. The controller 70 may be considered as
being operably coupled with the GPS 62 and the cellular
triangulation 64. The memory 68 may be configured to store an
executable program as well as information pertaining to a geofence
that is assigned to a building. The controller 70 may be configured
to temporarily turn on at least some of the location services in
order to determine an updated current location of the mobile device
60.
[0041] The controller 70 may compare the updated current location
to the geofence stored in the memory 68 and calculate a time to
fence value that indicates a minimum time in which the mobile
device 60 could cross the geofence. In some cases, the controller
70 may wait a delay time period that is based at least in part on
the calculated time to fence value before turning on the location
services on again, and then turn off the location services. In some
instances, the controller 58 may turn on the cellular triangulation
64 and not the GPS 62 if the calculated time to fence value is
greater than a predetermined value and may turn on the GPS 62 if
the calculated time to fence value is less than the predetermined
value. Typically, cellular triangulation 64 has less accuracy than
GPS 62, but also consumes far less power. As such, when the
calculated time to fence value is greater than the predetermined
value, and the updated current location is relatively further from
the geofence, the less accurate cellular triangulation 64 may be
sufficient to calculate the updated current location. When the
calculated time to fence value is less than the predetermined
value, and the updated current location is relatively closer to the
geofence, it may be desirable to use the more accurate GPS 62 to
calculate the updated current location. In some instances, the
controller 70 may be configured to cause the mobile device 60 to
transmit an indication of the updated current location of the
mobile device relative to the geofence.
[0042] FIG. 6 is a flow diagram showing an illustrative method for
implementing geofencing using a mobile device that has a GPS
capability and that is configured to be operably coupled to a
building controller. As shown at block 80, a geofence defining a
region about a building may be set. The GPS capability of the
mobile device may be turned on, as indicated at block 82. As seen
at block 84, an updated current location of the mobile device may
be ascertained via the GPS capability and then the GPS capability
may be turned off as shown at block 86. A position of the mobile
device relative to the geofence may be determined based on the
updated current location, as generally indicated at block 88. As
shown at block 90, a time to fence value that provides an estimate
of how soon an individual carrying the mobile device could cross
the geofence may be calculated.
[0043] In some instances, calculating the time to fence value
includes estimating how soon the individual carrying the mobile
device could cross the geofence when returning to the building. In
some cases, calculating the time to fence value includes estimating
how soon the individual carrying the mobile device could cross the
geofence when leaving the building. Calculating the time to fence
value may include determining a straight line distance between the
updated current location of the individual carrying the mobile
device and the building and subtracting a radius defining the
geofence, and determining the time to fence value based on a
predetermined maximum speed value (e.g. 80 mph). In some cases,
calculating the time to fence value may include determining a
straight line distance between the updated current location of the
individual carrying the mobile device and the closest point on the
geofence. In some cases, calculating the time to fence value may
include determining a driving route between the updated current
location of the individual carrying the mobile device and a point
on the geofence along the driving route, and determining the time
to fence value based on the driving route. These are just some
examples.
[0044] The GPS may remain off for a delay time period that is based
at least in part on the calculated time to fence value, as seen at
block 92. In some cases, control may pass back to block 82, and the
cycle may continue. In some cases, however, control may first pass
from block 92 to block 94, where the mobile device transmits an
indication of its position relative to the geofence. In some cases,
the indication of the position of the mobile device relative to the
geofence is transmitted when the updated current location of the
mobile device crosses the geofence, and the indication of the
position of the mobile device relative to the geofence indicates a
geofence crossing.
[0045] FIG. 7 is a flow diagram showing another illustrative method
for implementing geofencing using a mobile device that has a GPS
capability and that is configured to be operably coupled to a
building controller. As shown at block 80, a geofence defining a
region about a building may be set. The GPS capability of the
mobile device may be turned on, as indicated at block 82. As seen
at block 84, an updated current location of the mobile device may
be ascertained. The horizontal accuracy, or HDOP, of the current
location may be checked as seen at block 96. As decision block 98,
a determination is made as to whether the HDOP is above a
predetermined threshold. If yes, control passes to block 100 and
the GPS capability is turned off. A position of the mobile device
relative to the geofence may be determined based on the updated
current location, as generally indicated at block 102. As shown at
block 104, a time to fence value that provides an estimate of how
soon an individual carrying the mobile device could cross the
geofence may then be calculated.
[0046] In some instances, calculating the time to fence value
includes estimating how soon the individual carrying the mobile
device could cross the geofence when returning to the building. In
some cases, calculating the time to fence value includes estimating
how soon the individual carrying the mobile device could cross the
geofence when leaving the building. Calculating the time to fence
value may include determining a straight line distance between the
updated current location of the individual carrying the mobile
device and the building and subtracting a radius defining the
geofence, and determining the time to fence value based on a
predetermined maximum speed value (e.g. 80 mph). In some cases,
calculating the time to fence value may include determining a
straight line distance between the updated current location of the
individual carrying the mobile device and the closest point on the
geofence. In some cases, calculating the time to fence value may
include determining a driving route between the updated current
location of the individual carrying the mobile device and a point
on the geofence along the driving route, and determining the time
to fence value based on the driving route. These are just some
examples.
[0047] The GPS may remain off for a delay time period that is based
at least in part on the calculated time to fence value, as seen at
block 106. In some cases, control may pass back to block 82, and
the cycle may continue. In some cases, however, control passes from
block 106 to block 114, where the mobile device transmits an
indication of its position relative to the geofence. In some cases,
the indication of the position of the mobile device relative to the
geofence is transmitted when the updated current location of the
mobile device crosses the geofence, and the indication of the
position of the mobile device relative to the geofence indicates a
geofence crossing.
[0048] Returning back to decision block 98, if the HDOP is not
above a predetermined threshold, control passes to block 108. Block
108 keeps the GPS on during the subsequent delay period in an
attempt to get a more accurate reading on the current location. A
position of the mobile device relative to the geofence may then be
determined based on the updated current location, as generally
indicated at block 110. As shown at block 112, a time to fence
value that provides an estimate of how soon an individual carrying
the mobile device could cross the geofence may be calculated. In
some cases, control may pass back to block 84, and the cycle may
continue. In some cases, however, control passes from block 112 to
block 114, where the mobile device transmits an indication of its
position relative to the geofence. In some cases, the indication of
the position of the mobile device relative to the geofence is
transmitted when the updated current location of the mobile device
crosses the geofence, and the indication of the position of the
mobile device relative to the geofence indicates a geofence
crossing.
[0049] FIG. 8 is a flow diagram showing another illustrative method
for implementing geofencing using a mobile device that has a GPS
capability and that is configured to be operably coupled to a
building controller. As shown at block 80, a geofence defining a
region about a building may be set. The GPS capability of the
mobile device may be turned on, as indicated at block 82. As seen
at block 84, an updated current location of the mobile device may
be ascertained via the GPS capability and then the GPS capability
may be turned off as shown at block 86. A position of the mobile
device relative to the geofence may be determined based on the
updated current location, as generally indicated at block 88. As
shown at block 90, a time to fence value that provides an estimate
of how soon an individual carrying the mobile device could cross
the geofence may be calculated.
[0050] In some instances, calculating the time to fence value
includes estimating how soon the individual carrying the mobile
device could cross the geofence when returning to the building. In
some cases, calculating the time to fence value includes estimating
how soon the individual carrying the mobile device could cross the
geofence when leaving the building. Calculating the time to fence
value may, for example, include determining a straight line
distance between the updated current location of the individual
carrying the mobile device and the building and subtracting a
radius defining the geofence, and determining the time to fence
value based on a predetermined maximum speed value (e.g. 80 mph).
In some cases, calculating the time to fence value may include
determining a straight line distance between the updated current
location of the individual carrying the mobile device and the
closest point on the geofence. In some cases, calculating the time
to fence value may include determining a driving route between the
updated current location of the individual carrying the mobile
device and a point on the geofence along the driving route, and
determining the time to fence value based on the driving route.
These are just some examples.
[0051] The GPS may remain off for a delay time period that is based
at least in part on the calculated time to fence value, as seen at
block 92. In some cases, control may pass back to block 82, and the
cycle may continue. In some cases, however, control may be passed
from block 92 to block 94, where the mobile device transmits an
indication of its position relative to the geofence. In some cases,
the indication of the position of the mobile device relative to the
geofence is transmitted when the updated current location of the
mobile device crosses the geofence, and the indication of the
position of the mobile device relative to the geofence indicates a
geofence crossing. In some cases, the time to fence value may be
transmitted to a building controller so that the building
controller can regulate operation of a building system in
accordance with the time to fence value as seen at block 116.
[0052] Those skilled in the art will recognize that the present
disclosure may be manifested in a variety of forms other than the
specific embodiments described and contemplated herein.
Accordingly, departure in form and detail may be made without
departing from the scope and spirit of the present disclosure as
described in the appended claims.
* * * * *