Method and apparatus for reconnection in short-range wireless communication

• US 9,414,426 B2
• Filed: 06/04/2014
• Issued: 08/09/2016
• Est. Priority Date: 02/10/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kang, Dae-Hui, Hong, Ji-Seon, Park, Chun-Ho, Lee, Joo-Hyung
• Primary Examiner(s): Nguyen, Simon
• Application Number:
  US14/295,840
• Publication Number:
  US 20150230285A1
• Time in Patent Office: 797 Days
• Field of Search: 455 412- 413, 455/507, 455/517, 455/67.11, 455/67.16, 455/434, 455/515
• US Class Current: 1/1
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

A method of reconnecting communication with a second device by a first device in short-range wireless communication is provided. The method includes, when it is determined that a link loss is generated at a link with the second device, adjusting a scanning period of advertisement data broadcasted by the second device and a size of a scan window in which the scanning is performed, according to a time during which the link loss continues; and scanning the advertisement data at each of the adjusted scanning periods in the scan window corresponding to the adjusted size.

Claims

1. A method of reconnecting communication with a second device by a first device in short-range wireless communication, the method comprising:

adjusting a scanning period of advertisement data broadcasted by the second device based on a common period set for the first device and the second device in a link, in response to determining that a link loss is generated at the link with the second device;

determining a size of a scan window in which scanning is performed, according to a time during which the link loss continues;

updating an anchor point of the first device corresponding to the common period; and

scanning, at the updated anchor point, the advertisement data at each of the adjusted scanning periods in the scan window corresponding to the determined size.

2. The method of claim 1, wherein adjusting the scanning period and the size of the scan window comprises, when the time during which the link loss continues has a value within a predetermined range, adjusting the scanning period to be smaller than a predetermined period, and adjusting the size of the scan window to be larger than a predetermined size.

3. The method of claim 1, wherein adjusting the scanning period of the advertisement data comprises:

when link generating with the second device is performed, storing an error value generated while identifying the link generation; and

adjusting the scanning period of the advertisement data by adding the error value to the adjusted scanning period.

4. The method of claim 3, further comprising:

calculating an error probability generated when scanning the advertisement data, as the error value is generated;

adjusting a size of a scan window in which the scanning is performed, by using the calculated error probability.

5. The method of claim 3, further comprising:

when an error value generated in time information of the first device is larger than an error value generated in external time information, adjusting the adjusted scanning period by adding the error value generated in the external time information.

6. A method of reconnecting communication with a second device by a first device in short-range wireless communication, the method comprising:

storing size information of a scan window corresponding to each of broadcasting periods;

storing period information having a highest discovery probability for discovering the second device according to a specific size of the scan window;

when it is determined that link loss is generated at a link with the second device, identifying a broadcasting period of advertisement data transmitted from the second device;

identifying a value of a target time for reconnection with the second device, wherein the target time is a period having the highest discovery probability according to the identified broadcasting period based on the period information;

adjusting a size of the scan window in consideration of the identified broadcasting period based on the size information; and

scanning, in the identified value of the target time, the advertisement data in the scan window corresponding to the adjusted size.

7. The method of claim 6, further comprising:

identifying a second target time having the highest discovery probability for discovering the second device according to scanning periods stored for the broadcasting periods of each of a plurality of devices; and

adjusting a scanning period to a period of the second target time.

8. A method of reconnecting communication with a first device by a second device in short-range wireless communication, the method comprising:

determining a transmission period of advertisement data broadcasted to the first device, through communication with the first device;

adjusting the transmission period based on a common period which is set for the first device and the second device in a link, in response to generating a link loss at the link with the first device;

updating an anchor point of the second device corresponding to the common period; and

broadcasting, at the updated anchor point, the advertisement data at each adjusted transmission period.

9. The method of claim 8, wherein adjusting the transmission period of the advertisement data comprises:

when link generation with the first device is performed, storing an error value generated while identifying the link generation; and

adjusting the transmission period of the advertisement data by adding the error value to the adjusted transmission period.

10. The method of claim 9, further comprising:

when an error value generated in time information of the second device is larger than an error value generated in external time information, adjusting the adjusted transmission period by adding the error value generated in the external time information thereto.

11. A first device for reconnecting communication with a second device in short-range wireless communication, the first device comprising:

a controller configured to,

adjust a scanning period of advertisement data broadcasted by the second device based on a common period set for the first device and the second device in a link, in response to determining that a link loss is generated at the link with the second device,

determine a size of a scan window in which the scanning is performed, according to a time during which the link loss continues, and

update an anchor point related to first device corresponding to the common period; and

a short-range communication unit configured to scan, at the updated anchor point, the advertisement data at each of the adjusted scanning periods in the scan window corresponding to the determined size.

12. The first device of claim 11, wherein when the time during which the link loss continues has a value within a predetermined range, the controller is configured to adjust the scanning period to be less than a predetermined period, and the size of the scan window to be larger than a predetermined size.

13. The first device of claim 11, further comprising a memory unit that, when link generation with the second device is performed, stores an error value generated while the link generation is identified,

wherein the controller configured to adjust the scanning period of the advertisement data by adding the error value to the adjusted scanning period.

14. The first device of claim 13, wherein the controller is configured to calculate an error probability generated when the advertisement data is scanned, as the error value is generated, and to adjust a size of a scan window in which the scanning is performed, by using the calculated error probability.

15. The first device of claim 13, wherein when an error value generated in time information of the first device is larger than an error value generated in external time information, the controller is configured to adjust the adjusted scanning period by adding the error value generated in the external time information.

16. A first device for reconnecting communication with a second device in short-range wireless communication, the first device comprising:

a memory unit configured to store size information of a scan window corresponding to each of broadcasting periods and store period information having a highest discovery probability for discovering the second device according to a specific size of the scan window;

a controller configured to, when it is determined that link loss is generated at a link with the second device, identifies a broadcasting period of advertisement data transmitted from the second device, identify a value of a target time for reconnection with the second device, wherein the target time is a period having the highest discovery probability according to the identified broadcasting period based on the period information, and adjust a size of the scan window in consideration of the identified broadcasting period based on the size information; and

a short-range communication unit configured to scan, in the identified value of the target time, the advertisement data in the scan window corresponding to the adjusted size.

17. The first device of claim 16, wherein the controller is configured to identify a second target time having the highest discover probability for discovering the second device according to scanning periods stored for the broadcasting periods of each of a plurality of devices, and to adjust a scanning period to a period of the second target time.

18. A second device for reconnecting communication with a first device in short-range wireless communication, the second device comprising:

a controller configured to;

determine a transmission period of advertisement data broadcasted to the first device, through communication with the first device,

adjust the transmission period based on a common period which is set for the first device and the second device in a link, in response to determining that a link loss is generated at the link with the first device, and

update an anchor point of the second device corresponding to the common period; and

a short-range communication unit configured to broadcast, at the updated anchor point, the advertisement data at each adjusted transmission period.

19. The second device of 18, further comprising a memory unit that, when link generation with the first device is performed, stores an error value generated while the link generation is identified,

wherein the controller is configured to adjust the transmission period of the advertisement data by adding the error value to the adjusted transmission period.

20. The second device of claim 19, wherein when an error value generated in time information of the second device is larger than an error value generated in external time information, the controller is configured to adjust the adjusted transmission period by adding the error value generated in the external time information thereto.