Method and apparatus for origination based on distance and duration

• US 9,037,132 B1
• Filed: 10/13/2010
• Issued: 05/19/2015
• Est. Priority Date: 10/13/2010
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Pulugurta, Srikanth, Goyal, Anoop K., Oroskar, Siddharth S.
• Primary Examiner(s): Johnson, Gerald
• Application Number:
  US12/903,849
• Time in Patent Office: 1,679 Days
• Field of Search: 455/432.1
• US Class Current: 455/432.1
• CPC Class Codes: H04W 40/26 for hybrid routing by combining proactive and reactive routing
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

When a roaming wireless communication device seeks to originate a communication, the device may originate the communication in a roaming system because the device has not yet run a next scheduled scan for a more preferred, home, system. In the disclosed method, the device may evaluate a current distance from where the device was located when it successfully communicated to a home system and may further evaluate a current duration from that successful communication. If the distance is threshold short and perhaps further if the duration is threshold short, then the device may originate the communication in the home system without having detected the home system through a scheduled rescan. Further, to help expedite origination, the device may set its origination power at the power that it used for the last successful communication.

Claims

1. A method for a wireless communication device (WCD) to originate a communication, the method comprising:

the WCD determining a current distance of the WCD from a geographic location of the WCD where the WCD successfully communicated to a particular wireless system, wherein the geographic location of the WCD defines a geographic location of the WCD itself rather than a geographic location of the particular wireless system;

the WCD determining a current duration from when the WCD successfully communicated to the particular wireless system;

the WCD making a decision, based on at least the determined current distance and the determined current duration, of whether the WCD should originate the communication in the particular wireless system or rather in another wireless system, wherein making the decision based on at least the determined current distance and the determined current duration comprises deciding to originate the communication in the particular wireless system only if the determined current distance is threshold short and the determined current duration is threshold short, and otherwise deciding to originate the communication in the other wireless system; and

the WCD originating the communication according to the decision.

2. The method of claim 1, wherein the geographic location of the WCD is a geographic location of the WCD where the WCD last successfully communicated to the particular system.

3. The method of claim 1,

wherein the particular wireless system is a home system operated by a home wireless service provider to which the WCD subscribes and with which the WCD has a service account under which the WCD operates, and

wherein the other wireless system is a non-home system operated by a wireless service provider other than the home wireless service provider, wherein, when making the decision, the WCD is currently roaming in the other wireless system.

4. The method of claim 3, wherein the particular home system is a cell sector of the home system.

5. The method of claim 3, further comprising:

the WCD detecting a trigger for originating the communication;

the WCD making a determination that the WCD is currently roaming; and

responsive to the determination that the WCD is currently roaming, the WCD carrying out the (i) determining the current distance and the current duration, (ii) using at least the determined current distance and the determined current duration as bases to make the decision, and (iii) originating according to the decision.

6. The method of claim 1, further comprising:

the WCD making a record of a reverse-link transmission power that was used by the WCD to communicate to the particular wireless system when the WCD successfully communicated to the particular wireless system; and

if the decision is to originate the communication in the particular wireless system, then the WCD using the record as a basis to establish an initial transmission power to use for communicating to the particular wireless system.

7. The method of claim 6,

wherein originating the communication comprises transmitting an initial access probe on a reverse access channel, and

wherein using the record as the basis to establish the initial transmission power comprises transmitting the initial access probe at the recorded reverse-link transmission power.

8. The method of claim 6, wherein the WCD'"'"'s successful communication to the particular wireless system was an access probe transmission, and wherein the recorded reverse-link transmission power is a dynamically adjusted power at which the WCD engaged in that access probe transmission.

9. The method of claim 6, wherein the WCD'"'"'s successful communication to the particular wireless system was a reverse traffic channel transmission, and wherein the recorded reverse-link transmission power is a dynamically adjusted power at which the WCD engaged in that transmission on the reverse traffic channel.

10. The method of claim 1, wherein the WCD includes a global positioning system (GPS) receiver, the method further comprising:

the WCD using the GPS receiver to determine the geographic location of the WCD where the WCD successfully communicated to the particular system; and

the WCD recording the determined geographic location of the WCD where the WCD successfully communicated to the particular system,

wherein determining the current distance of the WCD from the geographic location of the WCD where the WCD successfully communicated to the particular wireless system comprises;

(i) using the GPS receiver to determine a current geographic location of the WCD, and (ii) comparing the determined current geographic location with the recorded geographic location, to establish the current distance.

11. The method of claim 1, wherein originating the communication according to the decision comprises:

if the decision is to originate the communication in the particular wireless system, then transmitting an origination request to the particular wireless system; and

if the decision is to originate the communication in the other wireless system, then transmitting an origination request to the other wireless system.

12. The method of claim 11, wherein if the decision is to originate the communication in the particular wireless system and the WCD therefore transmits the origination request to the particular wireless system, the method further comprises:

the WCD detecting that the particular wireless system does not respond to the origination request that the WCD transmitted to the particular wireless system, and the WCD responsively then originating the communication in the other wireless system.

13. A method for a wireless communication device (WCD) to manage origination of a communication while the WCD is roaming in a non-home system, the method comprising:

the WCD determining whether a distance between a current geographic location of the WCD and a geographic location where the WCD was when the WCD engaged in successful communication to a home system of the WCD is threshold short, wherein the geographic location of the WCD where the WCD was when the WCD engaged in successful communication to the home system defines a geographic location of the WCD itself rather than a geographic location of the home system;

the WCD determining whether a duration between a current time and a time when the WCD engaged in the successful communication to the home system is threshold short; and

if the WCD thereby determines that the distance is threshold short and the duration is threshold short, then the WCD originating the communication in the home system, and otherwise the WCD originating the communication in the non-home system.

14. The method of claim 13, wherein if the WCD determines that the distance is threshold short and the duration is threshold short, then the WCD using as initial power for transmission to the home system a transmission power that the WCD recorded from the successful communication by the WCD to the home system.

15. A wireless communication device (WCD) comprising:

a wireless communication interface for engaging in air-interface communication with base transceiver stations, wherein the wireless communication interface includes an antenna;

distance evaluation logic for determining a current distance of the WCD from a geographic location of the WCD where the WCD successfully communicated to a particular wireless system, wherein the geographic location of the WCD defines a geographic location of the WCD itself rather than a geographic location of the particular wireless system;

duration evaluation logic for determining a current duration from when the WCD successfully communicated to the particular wireless system,

system selection logic for making a decision of whether the WCD should originate a communication in the particular wireless system or rather in another wireless system, wherein the system selection logic being arranged to make the decision based at least on an evaluation of the determined current distance and based further on an evaluation of the determined current duration; and

origination logic for originating the communication according to the decision.

16. The WCD of claim 15, wherein the particular wireless system is a home system of the WCD, and the other wireless system is a non-home system of the WCD in which the WCD is roaming when the WCD makes the decision.

17. The WCD of claim 15, further comprising:

data storage for storing a record of transmission power used by the WCD when the WCD successfully communicated to the particular wireless system; and

power setting logic for using the stored record of the transmission power as a basis to set an initial transmission power to use for originating the communication in the particular wireless system.