RECONFIGURATION AND HANDOVER PROCEDURES FOR FUZZY CELLS

• US 20130215772A1
• Filed: 06/10/2011
• Published: 08/22/2013
• Est. Priority Date: 06/10/2010
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Kaur, Samian J., Pietraski, Philip J., Pinheiro, Ana Lucia A., Terry, Stephen E., Wang, Carl
• Granted Patent: US 9,326,211 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/00692 using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] allocation of physical resources in CoMP or in CA H04L5/0035
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

A wireless transmit/receive unit (WTRU) may transmit data via multiple component carriers associated with multiple eNode-Bs. The WTRU may receive a handover request message from a source eNode-B. While maintaining a connection with a component carrier on the source eNode-B, the WTRU may establish a connection with another component carrier on a target eNode-B.

Claims

1. A method for performing handover of a wireless transmit/receive unit (WTRU) having data transmitted via a plurality of component carriers, the method comprising:

the source eNode-B receiving a measurement report from the WTRU;

transmitting a reconfiguration message to the WTRU to instruct the WTRU to use a second component carrier associated with a target eNode-B to enable the WTRU to receive data split between the source e-NodeB and the target eNode-B; and

transmitting a component carrier cooperation (CCC) handover command to a target eNode-B, such that a first connection between the source eNode-B and the WTRU using a first component carrier is maintained while a second connection between to-the WTRU and the target eNode-B using the second component carrier is established.

3. The method of claim 1, wherein the reconfiguration message instructs the WTRU to use the second component carrier associated with the target eNode-B via medium access control (MAC) or radio resource control (RRC) signaling.

4. The method of claim 1, further comprising identifying the second component carrier associated with the target eNode-B.

5. The method of claim 4, wherein identifying the second component carrier comprises:

analyzing the measurement report received from the WTRU; and

identifying the second component carrier based on the analysis of the measurement report.

6. The method of claim 1, wherein the measurement report comprises a first signal quality of the first component carrier and a second signal quality of the second component carrier.

7. The method of claim 1, wherein the measurement report comprises a channel quality indication (CQI) for each secondary serving cell (Scell) associated with a cell identification and associated with either the eNode-B or the target eNode-B.

8. The method of claim 1, wherein the measurement report identifies a differential seen in a channel estimation between one or more Scells associated with a cell identification.

9. The method of claim 1, wherein the measurement report includes carrier specific time to trigger values.

10. The method of claim 1, wherein the CCC handover command instructs the target eNode-B to establish the second connection to the WTRU using the second component carrier.

11. The method of claim 1, further comprising receiving a recommendation message from the target eNode-B identifying the second component carrier.

12. The method of claim 1, further comprising receiving an acknowledgment message from target eNode-B

2. (canceled)

13. A method for performing handover of a wireless transmit/receive unit (WTRU) having data transmitted via a plurality of component carriers, the method comprising:

generating a measurement report, the measurement report indicating a handover event occured;

the WTRU transmitting a measurement report to a source eNode-B;

receiving a reconfiguration message from the source eNode-B instructing the WTRU to use a second component carrier associated with a target eNode-B to enable the WTRU to receive data split between the source eNode-B and the target eNode-B;

receiving a handover request message from the source eNode-B; and

establishing, while maintaining a first connection to the source eNode-B using a first component carrier, a second connection to the target eNode-B with the second component carrier.

14. The method of claim 13, wherein the handover request message instructs the WTRU to use the second component carrier via medium access control (MAC) or radio resource control (RRC) signaling.

15. The method of claim 13, wherein generating a measurement report comprises:

determining a first signal quality of the first component carrier; and

determining a second signal quality of the second component carrier.

16. The method of claim 13, wherein the measurement report comprises a channel quality indication (CQI) for each secondary serving cell (Scell) associated with a cell identification and associated with either the eNode-B or the target eNode-B.

17. The method of claim 13, wherein the measurement report identifies a differential seen in a channel estimation between one or more Scells associated with a cell identification.

18. The method of claim 13, wherein the measurement report includes carrier specific time to trigger values.

19. The method of claim 13, wherein the measurement report enables a CCC handover command to be transmitted to a target eNode-B, the CCC handover command instructing the target eNode-B to establish the second connection to the WTRU using the second component carrier.

20. A method for performing handover of a wireless transmit/receive unit (WTRU) having data transmitted via a plurality of component carriers, the method comprising:

the target eNode-B receiving a component carrier cooperation (CCC) handover command from a source eNode-B, the CCC handover command identifying a component carrier;

transmitting an acknowledgement message that indicates that the component carrier can be used to split data between the source eNode-B and the target eNode-B; and

establishing a connection between the WTRU and the target eNode-B using the component carrier based on the CCC handover command such that a connection between the WTRU and the source eNode-B is maintained.

21. The method of claim 20, wherein the acknowledgement enables the source eNode-B to instruct the WTRU to use the component carrier.

22. The method of claim 20, wherein establishing the connection with the component carrier comprises enabling the WTRU to use the component carrier via medium access control (MAC) or radio resource control (RRC) signaling.

23. The method of claim 20, wherein the CCC handover command instructs the target eNode-B to establish the connection to the WTRU using the component carrier.

24. The method of claim 20, further comprising transmitting a recommendation message identifying a second component carrier associated with the target eNode-B.

25. A method for performing handover of a wireless transmit/receive unit (WTRU) having data transmitted via a plurality of component carriers, the method comprising:

generating a measurement report, the measurement report indicating a handover event occured;

the WTRU transmitting a measurement report to a source eNode-B;

receiving a configuration message instructing the WTRU to use a second component carrier associated with a target eNode-B to enable the WTRU to receive data split between the source eNode-B and the target eNode B;

receiving a handover request message from the source eNode-B;

performing MAC fast deactivation to disconnect a first connection to the source eNode-B with a first component carrier associated with the source eNode-B; and

performing MAC fast activation to establish a second connection to the target eNode-B with a second component carrier associated with the target eNode-B.

26. The method of claim 25, wherein the configuration message enables the WTRU to use the first component carrier and the second component carrier.

27. The method of claim 25, wherein the handover request message instructs the WTRU to perform MAC fast activation and MAC fast deactivation.