Method and system for wireless communication setup with threshold distance between wireless communication device and base station

• US 9,131,423 B1
• Filed: 03/23/2011
• Issued: 09/08/2015
• Est. Priority Date: 03/23/2011
• Status: Active Grant

• Current Assignee: Sprint Spectrum LLC (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Vargantwar, Sachin R., Shah, Maulik K., Erich, Michael, Saska, Daniel S.
• Primary Examiner(s): Patel, Nimesh
• Application Number:
  US13/070,136
• Time in Patent Office: 1,630 Days
• Field of Search: 455/440, 455/456.1, 455/515, 455/435.1, 370/328, 370/331, 370/335, 370/329
• US Class Current: 1/1
• CPC Class Codes: G01S 13/878 Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector G01S13/874 takes precedence
• CPC Class Codes: G01S 2013/466 by Trilateration, i.e. two antennas or two sensors determine separately the distance to a target, whereby with the knowledge of the baseline length, i.e. the distance between the antennas or sensors, the position data of the target is determined
• CPC Class Codes: G01S 5/0263 by combining or switching between positions derived from two or more separate positioning systems
• CPC Class Codes: G01S 5/06 Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements G01S5/12 takes precedence
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 41/147 for predicting network behaviour
• CPC Class Codes: H04L 67/52 specially adapted for the location of the user terminal
• CPC Class Codes: H04W 36/026 Multicasting of data during hand-off
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 36/322 by location data
• CPC Class Codes: H04W 36/328 by altitude
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections

Abstract

Disclosed is a method and system that involves establishing a communication between a wireless device and a base station notwithstanding, and in response to, a determination that the wireless device is threshold far away from the base station. When the base station or its supporting network infrastructure determines that the device is threshold far away from the base station, the base station will simultaneously establish the communication via the base station and at least one other base station. Once adequate communication then occurs through the other base station, the first base station will be dropped from the communication, allowing the communication to proceed though the other base station.

Claims

1. In a radio access network (RAN) having a plurality of base stations including at least a first base station radiating to define a first coverage area and a second base station radiating to define a second coverage area, a method comprising:

receiving into the first base station via the first coverage area from a wireless communication device (WCD) a communication initiation request seeking initiation of communication; and

responsive to the communication initiation request, the RAN determining that the WCD is threshold distance threshold far away from the first base station, and in response to at least the determining, (i) the RAN establishing the communication simultaneously in the first coverage area and in the second coverage area, (ii) the RAN waiting to detect that the second base station has received adequate bearer traffic from the WCD via the second coverage area, and (iii) responsive to detecting that the second base station has received adequate bearer traffic from the WCD via the second coverage area, the RAN discontinuing the communication in the first coverage area while allowing the communication to continue in the second coverage area.

2. The method of claim 1, wherein the initiation request carries an indication of distance between the first base station and the WCD, and wherein determining that the WCD is threshold far away from the first base station comprises comparing the indicated distance with a distance threshold.

3. The method of claim 2, wherein the indication of distance comprises an indication of how long it takes for a pilot signal from the first base station to reach the WCD, whereby the indication of how long it takes for the pilot signal from the first base station to reach the WCD corresponds with distance between the first base station and the WCD.

4. The method of claim 2, wherein the distance threshold is a cell radius.

5. The method of claim 2, wherein the initiation request further carries an indication of distance between the second base station and the WCD, the method further comprising conditioning step iii on a determination that the WCD is threshold close to the second base station.

6. The method of claim 5, wherein conditioning step iii on a determination that the WCD is threshold close to the second base station comprises, during the established communication, receiving from the WCD an updated indication of distance between the second base station and the WCD, and using the received updated indication as a basis to determine that the WCD is threshold close to the second base station.

7. The method of claim 2, wherein the initiation request further carries an indication of WCD received signal strength for the second coverage area, the method further comprising conditioning step iii on a determination that indicated received signal strength for the second coverage area is threshold high enough.

8. The method of claim 1, wherein determining that the WCD is threshold far away from the first base station comprises using a location of the WCD and a location of the first base station to determine a distance between the WCD and the first base station, and comparing the determined distance with a distance threshold.

9. The method of claim 1, wherein establishing the communication simultaneously in the first coverage area and in the second coverage area comprises applying a channel assignment into soft handoff (CASHO) process.

10. The method of claim 1, wherein waiting to detect that the second base station has received adequate bearer traffic from the WCD via the second coverage area comprises waiting to determine that the second base station has received a threshold number of good traffic frames from the WCD via the second coverage area.

11. The method of claim 1, wherein discontinuing the communication in the first coverage area while allowing the communication to continue in the second coverage area comprises sending to the WCD a directive to discontinue the communication in the first coverage area.

12. In a radio access network (RAN) having a plurality of base stations including at least a first base station radiating to define a first coverage area and a second base station radiating to define a second coverage area, a method comprising:

receiving into the first base station via the first coverage area from a wireless communication device (WCD) a communication initiation request seeking initiation of communication, the initiation request carrying an indication of distance between the first base station and the WCD; and

responsive to the communication initiation request, the RAN determining based on the distance indication that the WCD is threshold far away from the first base station, and in response to at least the determining, (i) the RAN engaging in a channel assignment into soft handoff process to assign traffic channels for the communication concurrently in the first coverage area and second coverage area, (ii) the RAN waiting to detect that the second base station has received a threshold extent of good traffic frames from the WCD via the second coverage area, and (iii) responsive to detecting that the second base station has received the threshold extent of good traffic frames from the WCD via the second coverage area, the RAN sending to the WCD a directive for the WCD to discontinue the communication in the first coverage area but the RAN allowing the communication to continue in the second coverage area.

13. In a radio access network (RAN) having a plurality of base stations including at least a first base station radiating to define a first coverage area and a second base station radiating to define a second coverage area, a system comprising:

a processor;

data storage; and

program instructions stored in the data storage and executable by the processor to carry out functions comprising;

(a) receiving via the first base station and the first coverage area from a wireless communication device (WCD) a communication initiation request seeking initiation of communication, and

(b) responsive to the communication initiation request, determining that the WCD is threshold far away from the first base station, and in response to at least the determining, (i) establishing the communication simultaneously in the first coverage area and in the second coverage area, (ii) waiting to detect that the second base station has received adequate bearer traffic from the WCD via the second coverage area, and (iii) responsive to detecting that the second base station has received adequate bearer traffic from the WCD via the second coverage area, discontinuing the communication in the first coverage area while allowing the communication to continue in the second coverage area.

14. The system of claim 13, wherein the initiation request carries an indication of distance between the first base station and the WCD, and wherein determining that the WCD is threshold far away from the first base station comprises comparing the indicated distance with a distance threshold.

15. The system of claim 14, wherein the indication of distance comprises an indication of how long it takes for a pilot signal from the first base station to reach the WCD, whereby the indication of how long it takes for the pilot signal from the first base station to reach the WCD corresponds with distance between the first base station and the WCD.

16. The system of claim 14, wherein the distance threshold is a cell radius.

17. The system of claim 13, wherein determining that the WCD is threshold far away from the first base station comprises using a location of the WCD and a location of the first base station to determine a distance between the WCD and the first base station, and comparing the determined distance with a distance threshold.

18. The system of claim 13, wherein establishing the communication simultaneously in the first coverage area and in the second coverage area comprises applying a channel assignment into soft handoff (CASHO) process.

19. The system of claim 13, wherein waiting to detect that the second base station has received adequate bearer traffic from the WCD via the second coverage area comprises waiting to determine that the second base station has received a threshold number of good traffic frames from the WCD via the second coverage area.

20. The system of claim 13, wherein discontinuing the communication in the first coverage area while allowing the communication to continue in the second coverage area comprises sending to the WCD a directive to discontinue the communication in the first coverage area.