Mobility determination

Patent metadata

Field	Value
Publication number	US-10299243-B2
Application number	US-201415319029-A
Country	US
Kind code	B2
Filing date	Jul 30, 2014
Priority date	Jul 30, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

According to an example, mobility may be determined between a mobile device and a wireless access point (AP).

First claim

What is claimed is:

1. A method for mobility determination, the method comprising:
determining channel state information (CSI) for a wireless channel between a mobile device and a wireless access point (AP);
using the CSI to determine, by a processor, movement between the mobile device and the wireless AP;
determining a plurality of CSI vectors that represent the CSI at different times;
determining correlation within at least one pair of the plurality of CSI vectors to determine the movement between the mobile device and the wireless AP;
comparing a correlation value that is determined by the correlation to a static threshold and to an environmental threshold;
in response to a determination that the correlation value is greater than the static threshold, designating the mobile device as being static relative to the wireless AP; and
in response to a determination that the correlation value is less than the static threshold and greater than the environmental threshold, designating the mobile device as being under environmental mobility relative to the wireless AP, wherein the environmental mobility comprises at least one of object and person movement that is external to at least one of the mobile device and the wireless AP that affects the wireless channel between the mobile device and the wireless AP.

2. The method of claim 1 , wherein determining correlation within at least one pair of the plurality of CSI vectors to determine the movement between the mobile device and the wireless AP further comprises:
in response to a determination that the correlation value is less than the environmental threshold, designating the mobile device as being under micro-mobility or macro-mobility relative to the wireless AP, wherein the micro-mobility comprises a smaller amount of movement or constrained movement between the mobile device and the wireless AP compared to the macro-mobility, and wherein the micro-mobility and the macro-mobility comprise movement of at least one of the mobile device and the wireless AP that affects the wireless channel between the mobile device and the wireless AP.

3. The method of claim 1 , wherein the static threshold is approximately 0.95±0.05, and the environmental threshold is approximately 0.70±0.05.

4. The method of claim 1 , further comprising:
using time-of-flight (ToF) for a signal traversal between the mobile device and the wireless AP to determine a speed of the movement of the mobile device relative to the wireless AP.

5. The method of claim 4 , wherein using ToF for a signal traversal between the mobile device and the wireless AP to determine a speed of the movement of the mobile device relative to the wireless AP further comprises:
comparing the speed of the movement of the mobile device relative to the wireless AP to a ToF threshold;
in response to a determination that the speed of the movement of the mobile device relative to the wireless AP is less than the ToF threshold, designating the movement between the mobile device and the wireless AP as micro-mobility; and
in response to a determination that the speed of the movement of the mobile device relative to the wireless AP is greater than the ToF threshold, designating the movement between the mobile device and the wireless AP as macro-mobility,
wherein the micro-mobility and the macro-mobility comprise movement of at least one of the mobile device and the wireless AP that affects the wireless channel between the mobile device and the wireless AP.

6. The method of claim 1 , further comprising:
determining the CSI as a function of a number of subcarriers and antennas supported by the wireless AP.

7. A mobility determination apparatus comprising:
a processor; and
a memory storing machine readable instructions that when executed by the processor cause the processor to:
use channel state Information (CSI) to determine movement between a mobile device and a wireless access point (AP);
determine whether the mobile device is static relative to the wireless AP;
in response to a determination that the mobile device is static relative to the wireless AP, designating the mobile device as being under a static state;
in response to a determination that the mobile device is not static relative to the wireless AP, determine environmental mobility between the mobile device and the wireless AP, wherein the environmental mobility comprises at least one of object and person movement that is external to at least one of the mobile device and the wireless AP that affects a wireless channel between the mobile device and the wireless AP;
in response to a determination that the mobile device is not under the environmental mobility relative to the wireless AP, determine movement of at least one of the mobile device and the wireless AP that affects the wireless channel between the mobile device and the wireless AP; and
in response to a determination that the mobile device is moving relative to the wireless AP, use time-of-flight (ToF) for a signal traversal between the mobile device and the wireless AP to determine a speed of the movement of the mobile device relative to the wireless AP.

8. The mobility determination apparatus according to claim 7 , wherein the machine readable instructions to use CSI to determine movement between a mobile device and a wireless AP, further cause the processor to:
determine a plurality of CSI vectors that represent the CSI at different times; and
determine correlation within at least one pair of the plurality of CSI vectors to determine the movement between the mobile device and the wireless AP.

9. The mobility determination apparatus according to claim 7 , wherein the machine readable instructions further cause the processor to:
determine a wireless protocol for transmission of data between the mobile device and the wireless AP based on the determined movement between the mobile device and the wireless AP, and the determined speed of the movement of the mobile device relative to the wireless AP.

10. A non-transitory computer readable medium having stored thereon machine readable instructions to provide mobility determination, the machine readable instructions, when executed, cause a processor to:
determine time-of-flight (ToF) for a signal traversal between a mobile device and a wireless access point (AP);
use the ToF for the signal traversal between the mobile device and the wireless AP to determine a speed of movement of the mobile device relative to the wireless AP;
determine whether the mobile device is static relative to the wireless AP;
in response to a determination that the mobile device is static relative to the wireless AP, designating the mobile device as being under a static state;
in response to a determination that the mobile device is not static relative to the wireless AP, determine environmental mobility between the mobile device and the wireless AP, wherein the environmental mobility comprises at least one of object and person movement that is external to at least one of the mobile device and the wireless AP that affects a wireless channel between the mobile device and the wireless AP; and
in response to a determination that the mobile device is not under the environmental mobility relative to the wireless AP, determine movement of at least one of the mobile device and the wireless AP that affects the wireless channel between the mobile device and the wireless AP.

11. The non-transitory computer readable medium of claim 10 , wherein the machine readable instructions to use the ToF for the signal traversal between the mobile device and the wireless AP to determine a speed of movement, of the mobile device relative to the wireless AP, further cause the proce

Assignees

• Hewlett Packard Entpr Dev Lp

Inventors

• Sen Souvik
• Sun Li

Classifications

• H04W64/006 Primary

  with additional information processing, e.g. for direction or speed determination · CPC title

• H04W88/08

  Access point devices · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04B7/0452

  Multi-user MIMO systems · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title