Handover data integrity in a wireless data network

• US 8,045,525 B1
• Filed: 10/02/2008
• Issued: 10/25/2011
• Est. Priority Date: 10/02/2007
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Bontu, Chandra Sekhar, Kanesalingam, Prabaharan, Chandramouli, Devaki
• Primary Examiner(s): Qureshi, Afsar M.
• Application Number:
  US12/244,506
• Time in Patent Office: 1,118 Days
• Field of Search: 455/411, 455/434, 455/436, 455/442, 455/452.2, 455/561, 455/522, 455/574, 455/456.2, 370331-333, 370/311, 370/335, 709/204, 709/223
• US Class Current: 370/331
• CPC Class Codes: H04W 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface

Abstract

Provided is a method and apparatus for handover data integrity of a mobile station in a wireless data network with a plurality of wireless network service areas. The method and apparatus includes initiation of a handover by a mobile station, identifying at least one target access network (ASN) for handover from a serving ASN that services wireless data communications with the mobile station. When at least one target ASN is identified, receiving a data integrity capability from the at least one target ASN. With the received data integrity capability, determining whether a direct data delivery mode is available as a data integrity mode based upon the received data integrity capability. When the direct data delivery mode is available as a data integrity mode, direct data delivery if performed with the data associated with the service flow from the serving ASN to the at least one target ASN. When the direct data delivery is accomplished, the mobile station handover is completed from the serving ASN to one of the target ASNs.

Claims

1. A method for handover data integrity of a mobile station in a wireless data network, the method comprises:

identifying at least one target access network (ASN) for handover from a serving ASN that services wireless data communications with the mobile station;

receiving a data integrity capability from the at least one target ASN;

determining whether a direct data delivery mode is available as a data integrity mode based upon the data integrity capability;

when the direct data delivery mode is available as the data integrity mode, performing direct data delivery of data associated with a service flow from the serving ASN to the at least one target ASN; and

performing a handover of the mobile station to a target ASN of the at least one target ASN to service the wireless data communications of the mobile station.

2. The method of claim 1 wherein the direct data delivery mode comprises:

buffering the data associated with the service flow at the serving ASN; and

forwarding the buffered data to the at least one target ASN.

3. The method of claim 2, wherein the buffered data is forwarded to the at least one target ASN via a data path provided by an anchor ASN.

4. The method of claim 2, wherein a handover controller (HOC) operates to buffer the data associated with the service flow at the serving ASN.

5. The method of claim 2, wherein the buffered data is forwarded to the at least one target ASN via a direct path between the serving ASN and the at least one target ASN.

6. The method of claim 2, wherein forwarding the buffered data to the at least one target ASN occurs during the handover of the mobile station to the at least one target ASN.

7. A method for handover data integrity of a mobile station in a wireless data network, the method comprising:

identifying at least one target access network (ASN) for handover from a serving ASN servicing wireless data communications with the mobile station;

negotiating, via an anchor ASN, a data integrity mode of a plurality of data integrity modes based upon a data integrity capability provided by the at least one target ASN;

when the data integrity capability provided by the at least one target ASN accommodates a first data integrity mode of the plurality of data integrity modes, multi-unicasting data associated with a service flow via the anchor ASN to the serving ASN and the at least one target ASN;

when the data integrity capability provided by the at least one target ASN accommodates a second data integrity mode of the plurality of data integrity modes, performing direct data delivery of the data associated with the service flow from the serving ASN to the at least one target ASN; and

performing the handover of the mobile station to a target ASN of the at least one target ASN, wherein the target ASN of the at least one target ASN begins servicing the wireless data communications with the mobile station.

8. The method of claim 7 wherein the second data integrity mode comprises:

buffering the data associated with the service flow at the serving ASN; and

forwarding the buffered data to the at least one target ASN.

9. The method of claim 8, wherein a handover controller (HOC) operates to buffer the data associated with the service flow at the serving ASN.

10. The method of claim 8, wherein the buffered data is forwarded to the at least one target ASN via a data path provided by the anchor ASN.

11. The method of claim 8, wherein forwarding the buffered data to the at least one target ASN occurs during performing the handover of the mobile station to the at least one target ASN.

12. The method of claim 8, wherein forwarding the buffered data to the at least one target ASN occurs in preparation of performing the handover of the mobile station to the target ASN of the at least one target ASN.

13. Apparatus for an anchor access network (ASN) to provide handover data integrity in a wireless data network, the apparatus comprising:

processing module; and

memory operably coupled to the processing module, wherein the memory stores operational instructions that cause the processing module to;

identify at least one target ASN for handover from a serving ASN that services wireless data communications with a mobile station;

negotiate with the at least one target ASN a data integrity mode of a plurality of data integrity modes based upon a data integrity capability provided by the at least one target ASN;

when the data integrity capability provided by the at least one target ASN accommodates a first data integrity mode of the plurality of data integrity modes, multi-unicast data associated with a service flow via the anchor ASN data to the serving ASN and to the at least one target ASN;

when the data integrity capability provided by the at least one target ASN accommodates a second data integrity mode of the plurality of data integrity modes, initiate direct delivery of the data associated with the service flow from the serving ASN to the at least one target ASN; and

perform the handover of the mobile station to a target ASN of the at least one target ASN, wherein the target ASN of the at least one target ASN begins servicing the wireless data communications with the mobile station.

14. The apparatus of claim 13 wherein the memory further stores operational instructions to provide the first data integrity mode by:

buffering the data associated with the service flow at each of the anchor ASN and the at least one target ASN.

15. The apparatus of claim 13 wherein the memory further stores operational instructions to provide the second data integrity mode by:

buffering the data associated with the service flow at the serving ASN; and

forwarding the buffered data to the at least one target ASN.

16. The apparatus of claim 15, wherein the memory further stores operational instructions to forward the buffered data to the at least one target ASN via a data path provided by the anchor ASN.

17. The apparatus of claim 15, wherein the memory further stores operational instructions to forward the buffered data to the at least one target ASN while performing the handover of the mobile station to the at least one target ASN.

18. The apparatus of claim 15, wherein the memory further stores operational instructions to forward the buffered data to the at least one target ASN in preparation of performing the handover of the mobile station to the target ASN of the at least one target ASN.