Method of updating a unique call back number for a wireless emergency call

• US 20060189303A1
• Filed: 02/18/2005
• Published: 08/24/2006
• Est. Priority Date: 02/18/2005
• Status: Active Grant

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Inventors: Rollender, Douglas H.
• Granted Patent: US 7,715,821 B2
• Time in Patent Office: Days
• US Class Current: 455/417
• CPC Class Codes: H04M 2207/18 wireless networks
• CPC Class Codes: H04M 2242/04 for emergency applications
• CPC Class Codes: H04M 3/42059 Making use of the calling party identifier
• CPC Class Codes: H04M 3/42068 where the identifier is used to access a profile
• CPC Class Codes: H04M 3/4931 Directory assistance systems

Abstract

In the method of updating a unique call back number for a wireless unit having originated an emergency call, a unique call back number for the wireless unit is updated (e.g., changed or added to a list of unique call back numbers) based on a received unique call back number.

Claims

1. A method of updating a unique call back number for a wireless unit having originated an emergency call, comprising:

updating a unique call back number for the wireless unit based on a received unique call back number.

2. The method of claim 1, further comprising:

receiving the received unique call back number from a network controller to which the wireless unit is being handed off.

3. The method of claim 2, wherein the received unique call back number includes information identifying the network controller.

4. The method of claim 2, wherein the received unique call back number includes routing information for routing a call to the network controller.

5. The method of claim 2, wherein the receiving step receives the received unique call back number at a network controller handing off the wireless unit.

6. The method of claim 2, further comprising:

receiving the received unique call back number from a network controller to which the wireless unit is being handed back.

7. The method of claim 1, wherein the received unique call back number identifies a network controller that generated the received unique call back number.

8. The method of claim 1, wherein the received unique call back number includes information identifying a different network controller than an existing unique call back number for the wireless unit.

9. The method of claim 1, further comprising:

receiving a first unique call back number for the wireless unit, the first unique call back number including information identifying a first network controller; and

receiving a second unique call back number for the wireless unit, the second unique call back number including information identifying a second network controller; and

wherein

the updating step changes a unique call back number associated with the wireless unit from the first unique call back number to the second unique call back number.

10. The method of claim 9, wherein the updating step changes the unique call back number associated with the wireless unit at an emergency response register associated with the first network controller.

11. The method of claim 9, wherein the updating step changes the unique call back number associated with the wireless unit at an emergency response register associated with a public service answering point.

12. The method of claim 1, further comprising:

receiving a first unique call back number for the wireless unit, the first unique call back number including information identifying the first network controller; and

receiving a second unique call back number for the wireless unit, the second unique call back number including information identifying a second network controller; and

wherein

the updating step adds the second unique call back number to a list of possible call back numbers for the wireless unit that includes the first unique call back number.

13. The method of claim 12, wherein the updating step adds the second unique call back number to a list of possible call back numbers for the wireless unit that includes the first unique call back number at an emergency response register associated with the first network controller.

14. The method of claim 12, wherein the updating step adds the second unique call back number to a list of possible call back numbers for the wireless unit that includes the first unique call back number at a first emergency response register associated with a first public service answering point.

15. The method of claim 14, further comprising:

sending a call back instruction from the first emergency response register to a second emergency response register if the second network controller identified by the second unique call back number is served a second public service answering point associated with the second emergency response register and call back by the first public service answering point based on the first unique call back number is unsuccessful, the call back instruction identifying the wireless unit, providing the second unique call back number and instructing the second public service answering point to perform call back to the identified wireless unit using the second unique call back number.

16. The method of claim 1, further comprising:

receiving an indication that the wireless unit is being served by a new network controller;

requesting a unique call back number from the new network controller; and

receiving the received call back number from the new network controller.

17. The method of claim 1, wherein the updating step sends an instruction to an emergency call register to update the unique call back number for the wireless unit at the emergency call register.

18. The method of claim 1, further comprising:

generating a first unique call back number for a wireless unit;

receiving a second unique call back number; and

wherein

the updating step includes sending an instruction to an emergency call register to update the unique call back number for the wireless unit at the emergency call register.

19. A method of updating a unique call back number for a wireless unit having originated an emergency call, comprising:

receiving a first unique call back number for the wireless unit, the first unique call back number including information identifying the first network controller; and

receiving a second unique call back number for the wireless unit, the second unique call back number including information identifying a second network controller; and

wherein

adding the second unique call back number to a list of possible call back numbers for the wireless unit that includes the first unique call back number.

20. The method of claim 19, further comprising:

first performing call back using the first unique call back number if an emergency call for the first wireless unit drops; and

second performing call back using the second unique call back number if the first performing step is unsuccessful.