OPTIMIZED MOBILITY MANAGEMENT PROCEDURES USING PRE-REGISTRATION TUNNELING PROCEDURES

• US 20090016302A1
• Filed: 07/09/2008
• Published: 01/15/2009
• Est. Priority Date: 07/09/2007
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Shaheen, Kamel M.
• Application Number:
  US12/169,775
• Publication Number:
  US 20090016302A1
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 36/0022 for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/0069 in case of dual connectivity, e.g. decoupled uplink/downlink
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A method and apparatus for optimizing mobility management procedures comprises establishing a tunnel between a wireless transmit/receive unit (WTRU) and a target system core network (CN). The WTRU is handed over from a source system CN system to the target system CN.

Claims

1. A method for handover (HO) in a wireless transmit receive unit (WTRU) from a source system to a target system, the WTRU including a first transceiver and a second transceiver, the method comprising:

a first transceiver radio resource control (RRC) layer included in the first handover communicating the HO message to a second transceiver mobility management (MM) layer included in the second transceiver;

sending a cross communication including an HO acknowledgement from the second transceiver MM layer to the first transceiver RRC layer, whereby the HO acknowledgement is transmitted to the source system by the first transceiver; and

pre-registering the second transceiver by the target system prior to handover, wherein the first transceiver RRC layer cross communicates registration information from the target system to the second transceiver MM layer.

2. The method of claim 1, further comprising receiving at the first transceiver a message to initiate target network registration from the source system, wherein the message is sent to the second transceiver MM layer by the first transceiver RRC layer.

3. The method of claim 1, further comprising:

receiving at the first transceiver a second system measurement list from the first system; and

sending the measurement list to the second transceiver.

4. The method of claim 3, wherein the first transceiver sends to the second transceiver a list of target systems.

5. The method of claim 4, further comprising:

measuring at the second transceiver channels for the list of target systems;

sending a measurement report to the first transceiver; and

transmitting the measurement report to the source system.

6. The method of claim 1, further comprising establishing a direct HO tunnel between the second transceiver and the target systems.

7. The method of claim 4, further comprising initializing the second transceiver for measuring the target system channels.

8. The method of claim 6, further comprising turning off the first transceiver upon handover to the target system.

9. The method of claim 1, wherein the target system is a non-3GPP network and the source system is a 3GPP network.

10. The method of claim 9, wherein the first transceiver is a 3GPP transceiver and the second transceiver is a non-3GPP transceiver.

11. The method of claim 1, wherein the target system is a 3GPP network and the source system is a non-3GPP network.

12. The method of claim 11, wherein the first transceiver is a non-3GPP transceiver and the second transceiver is a 3GPP transceiver.

13. The method of claim 1 wherein the handover is for session initiation protocol (SIP) based handover.

14. The method of claim 13 further comprising:

initiating IP configuration; and

the second transceiver conducting target IP configuration procedures with the target system via the first transceiver.

15. The method of claim 14, further comprising:

providing to the second transceiver the IP configuration for the target system;

the second transceiver conducting target radio contact procedures directly with the target system.

16. The method of claim 13, further comprising:

initiating SIP registration by the second transceiver with the target system through the first transceiver and the source system.

17. The method of claim 16, further comprising:

the first transceiver sending the SIP registration information to the second transceiver.

18. The method of claim 17, further comprising:

establishing SIP connectivity between the second transceiver and the target system.

19. The method of claim 18, further comprising:

de-registering the first transceiver.

20. The method of claim 19, further comprising:

receiving at the first transceiver a handover complete message; and

turning off the first transceiver.

21. The method of claim 20 further comprising:

the second transceiver conducting radio frequency connectivity procedures with the target system.

22. A wireless transmit receive unit (WTRU) configured to conduct handover from a source system to a target system, the WTRU comprising:

a first transceiver for communicating with the source system, including at least a first mobility management (MM) layer and a radio resource control (RRC) layer; and

a second transceiver for communicating with the target system upon handover, including at least a second MM layer and a second RRC layer;

wherein handover is conducted between the source system and the second transceiver through a cross communication link between the first RRC layer and second MM layer and the first MM layer and the second RRC layer;

the cross communication link thereby establishing an handover direct tunnel between the second transceiver and target system.

23. The WTRU of claim 22, wherein the second transceiver receives a HO direct tunnel message, including a target system tunnel endpoint ID, from the source system through the communication link between the first RRC layer and the second MM layer.

24. The WTRU of claim 22, wherein the second transceiver receives target system registration information from the target system through the cross communication between the first RRC layer and the second MM layer, whereby the second transceiver is pre-registered and pre-authenticated by the target system prior to handover.

25. The WTRU of claim 24, wherein the first transceiver is turned off and the second transceiver turned on upon initiating handover to the target system.

26. The WTRU of claim 22, wherein the source system is a 3^rd Generation Partnership Project (3GPP) network and the target system is a non-3GPP network.

27. The WTRU of claim 26, wherein the first transceiver is configured to communicate within a 3GPP network and the second transceiver is configured to communicate within a non-3GPP network.

28. The WTRU of claim 22, wherein the source system and the target system is a 3GPP network.

29. The WTRU of claim 28, wherein the first transceiver is configured to communicate with a non-3GPP network and the second transceiver is configured to communicate with a 3GPP network.

30. The WTRU of claim 22, wherein the first transceiver receives a HO direct tunnel message, including a target system tunnel endpoint ID, from the source system through the communication link between the second RRC layer and the first MM layer.

31. The WTRU of claim 22, wherein the first transceiver receives target system registration information from the target system through the cross communication between the second RRC layer and the first MM layer, whereby the first transceiver is pre-registered and pre-authenticated by the target system prior to handover.

32. The WTRU of claim 24, wherein the second transceiver is turned off and the first transceiver turned on upon initiating handover to the target system.