Systems and methods for locating geographical regions of mobile computer users

• US 7,590,720 B2
• Filed: 11/06/2006
• Issued: 09/15/2009
• Est. Priority Date: 01/12/2001
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Bahl, Paramvir
• Primary Examiner(s): BATES, KEVIN T
• Application Number:
  US11/557,058
• Publication Number:
  US 20070066322A1
• Time in Patent Office: 1,044 Days
• Field of Search: 709/223, 709/217, 455/403, 455/404.1, 455/456.1, 342/118, 342/126
• US Class Current: 709/223
• CPC Class Codes: H04L 67/52 specially adapted for the location of the user terminal
• CPC Class Codes: H04L 67/535 Tracking the activity of the user network monitoring arrangements H04L43/00; recording of computer activity G06F11/34
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

System and methods for locating a mobile computing unit are described. In some cases the systems and/or methods determine a geographical region in which a mobile computing unit is located using received radio frequency (“RF”) signals from a plurality of RF beacons having known locations and using environmental profiling to establish the geographical region of the mobile computing unit.

Claims

1. A method, comprising:

determining a geographical region in which a mobile computing unit is located, wherein the act of determining the geographical region comprises receiving RF signals from a plurality of RF beacons having known locations and using environmental profiling to establish the geographical region of the mobile computing unit, wherein environmental profiling comprises comparing a strength of the received RF signal with a table of known locations inside a plurality of buildings and outside of the buildings and a base station signal strength at those locations;

periodically transmitting, from the mobile computing unit, the geographical region of the mobile computing unit to a network server together with a user name of a user using the mobile computing unit; and

including an active signal with the periodically transmitted information when the user is actively using the mobile computing unit.

2. The method as recited in claim 1, wherein the geographical region is a room in one of the buildings.

3. The method as recited in claim 2, wherein the act of determining the geographical region determines an altitude of the mobile computing unit.

4. The method as recited in claim 3, wherein the act of determining the altitude of the mobile computing unit is based on the received RF signals having known locations including known altitudes and using the environmental profiling.

5. The method as recited in claim 1, wherein the user actively using the mobile computing unit further comprises the user having used the computing unit within a pre-defined time period.

6. The method as recited in claim 1, wherein the periodically transmitting the geographical region of the mobile computer unit to a network server only occurs upon a request from the network server for the mobile computer unit to update the geographical region of the computer unit.

7. A mobile computing unit, comprising:

memory;

a wireless network interface configured to connect the mobile computing unit to multiple wireless access points of one or more remote servers;

a location tracking service configured to determine a geographical region of the mobile computer unit a radio frequency system capable of determining the geographical region by detecting signals transmitted from multiple wireless access points, wherein the location tracking service compares a strength of the received signals with a table of known geographical regions and a base station signal strength at those geographical regions, wherein the geographical regions include a plurality of buildings and locations inside of the buildings and locations outside of the buildings;

a location manager configured to periodically transmit the geographical region of the mobile computing unit to one or more of the remote servers via the wireless network interface and to periodically transmit an active signal when a user logged onto the mobile computing unit has actively used the unit within a specified period of time; and

wherein the geographical region comprises a state, a county, a city, and a location inside one of the buildings or outside one of the buildings, and wherein the location manager is configured to invoke the location tracking service when commanded to do so by a second computing unit.

8. The mobile computing unit as recited in claim 7, wherein the geographical region further comprises a room in one of the buildings.

9. The mobile computing unit as recited in claim 8, wherein the location tracking service is further configured to determine the altitude of the mobile computer unit.

10. The mobile computing unit as recited in claim 7, wherein the location manager is further configured to transmit a user name of a user logged onto the mobile computing unit to one or more of the remote servers together with the geographical region of the mobile computing unit.

11. The mobile computing unit as recited in claim 7, wherein the location manager identifies and transmits the geographical region of a network node with which the mobile computing unit is communicating as the geographical region of the mobile computing unit.

12. A method comprising:

receiving radio frequency transmissions emitted from a plurality of radio frequency base stations of a wireless local area network;

measuring relative strengths of the radio frequency transmissions;

determining a room in one of a plurality of buildings or a location outside of the buildings where a mobile computing device is located based on the relative strengths by comparing the relative strengths with a table of known rooms in the building and known locations outside of the buildings and a base station signal strength at those rooms in the buildings or those locations outside of the buildings;

identifying the room in the building or the location outside of the buildings of the mobile computing device as that of a computer user, wherein the identifying comprises calculating a time differential between a time stamp associated with the room in the building or the location outside of the buildings of the mobile computing device and a current time, comparing the time differential with a predetermined time threshold, and defining the room in the building or the location outside of the buildings of the mobile computing device as that of the computer user if the time differential is less than the time threshold;

receiving a request for the room in the building or the location outside of the buildings of the computer user from a computing unit; and

transmitting the room in the building or the location outside of the buildings of the computer user to the computing unit.

13. The method as recited in claim 12, wherein the act of determining the room in the building or the location outside of the buildings based on the relative strengths determines an altitude of the mobile computing device.

14. The method of claim 12, wherein the acts of receiving the radio frequency transmissions, measuring the relative strengths, and determining the room in the building or the location outside of the buildings are performed by the mobile computing device.

15. The method of claim 12, wherein the act of identifying the room in the building or the location outside of the buildings of the mobile computing device as that of the computer user comprises receiving from the mobile computing device an identifier associated with the computer user.

16. The method of claim 12, further comprising:

receiving an active signal indicating that the computer user has actively used the mobile computing device within a specified period of time, and wherein the act of identifying the room in the building or the location outside of the buildings comprises defining the room in the building or the location outside of the buildings of the mobile computing device as that of the computer user if the active signal has been received within a predetermined period of time.