PPP link negotiation in mobile IP systems

• US 20040062254A1
• Filed: 02/25/2003
• Published: 04/01/2004
• Est. Priority Date: 04/03/2002
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Abrol, Nischal, Lioy, Marcello, Kuzhiyil, Anup
• Granted Patent: US 6,973,088 B2
• Time in Patent Office: Days
• US Class Current: 370/401
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/168 specially adapted for link layer protocols, e.g. asynchronous transfer mode [ATM], synchronous optical network [SONET] or point-to-point protocol [PPP]
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 88/005 Data network PoA devices

Abstract

This disclosure describes techniques for establishing a PPP data session between a user terminal (UT) and an Interworking Function (IWF). The process involves establishing a PPP2 link with the IWF in response to detecting a mobile IP data session request from the UT, detecting a PP1 link with the UT in response to the PP2 link being established, detecting that a PPP2 link failure has occurred, and reconfiguring at least one of the WCD and the UT to an initial state.

Claims

1. A wireless communication device (WCD) for establishing a PPP data session between a user terminal (UT) and an Interworking Function (IWF), comprising:

means for establishing a PPP2 link with the IWF in response to detecting a mobile IP data session request from the UT;

means for detecting a PP1 link with the UT in response to the PP2 link being established;

means for detecting that a PPP2 link failure has occurred; and

means for reconfiguring at least one of the WCD and the UT to an initial state.

2. The WCD of claim 1, wherein the failure occurs after the PPP2 link is established.

3. The WCD of claim 1, wherein the failure occurs before the PPP1 is established.

4. The WCD of claim 1, wherein the failure occurs in response to the WCD timing out.

5. The WCD of claim 1, wherein the failure occurs in response to the WCD detecting an end of data session request.

6. The WCD of claim 1, further comprising means for performing a first comparison after the PPP1 link is established.

7. The WCD of claim 6, further comprising means for reestablishing the PPP2 link in response to the first comparison.

8. The WCD of claim 7, further comprising means for performing a second comparison after the PPP2 link is re-established.

9. The WCD of claim 8, wherein a no match is identified as a failure by the means for detecting that a PPP2 link failure has occurred.

10. In a wireless communication device (WCD), a method of establishing a PPP data session between a user terminal (UT) and an Interworking Function (IWF), comprising:

establishing a PPP2 link with the IWF in response to detecting a mobile IP data session request from the UT;

detecting a PP1 link with the UT in response to the PP2 link being established;

detecting that a PPP2 link failure has occurred; and

reconfiguring at least one of the WCD and the UT to an initial state.

11. The method of claim 10, wherein the failure occurs after the PPP2 link is established.

12. The method of claim 10, wherein the failure occurs before the PPP1 is established.

13. The method of claim 10, wherein the failure occurs in response to the WCD timing out.

14. The method of claim 10, wherein the failure occurs in response to the WCD detecting an end of data session request.

15. The method of claim 10, further comprising performing a first comparison after the PPP1 link is established.

16. The method of claim 15, further comprising re-establishing the PPP2 link in response to the first comparison.

17. The method of claim 16, further comprising performing a second comparison after the PPP2 link is re-established.

18. The method of claim 17, wherein a no match at the second comparison is identified as a failure when detecting that a PPP2 link failure has occurred.