SYSTEM AND METHOD FOR MOBILITY IN A MULTI-POINT HSDPA COMMUNICATION NETWORK

• US 20120163338A1
• Filed: 06/27/2011
• Published: 06/28/2012
• Est. Priority Date: 06/28/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zhang, Danlu, Sambhwani, Sharad Deepak, Kapoor, Rohit, Hou, Jilei, Ge, Weiyan
• Granted Patent: US 8,989,140 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 36/00835 Determination of neighbour cell lists
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections

Abstract

A method and apparatus for wireless communication may provide for mobility in a Multi-Point HSDPA network capable of downlink aggregation. Some aspects of the disclosure provide modified mobility events utilized for altering the Active Set for a UE. Here, the addition of a cell to the Active Set can coincide with making that cell a secondary serving cell. Further, the deletion of a secondary serving cell from the Active Set can coincide with switching off the Multi-Point HSDPA mode. Still further, a modified mobility event for an HSDPA serving cell change can be utilized to swap a primary serving cell and a secondary serving cell.

Claims

1. A method of wireless communication for a User Equipment (UE) that is capable of a Multi-Point HSDPA mode utilizing a primary serving cell and a secondary serving cell, the method comprising:

receiving an RRC message comprising an information element adapted to inform the UE that the secondary serving cell utilizes the same carrier frequency as that of the primary serving cell; and

transmitting a response to the RRC message to confirm completion of a reconfiguration in accordance with the RRC message.

2. The method of claim 1, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode to receive downlink data from the primary serving cell and the secondary serving cell.

3. The method of claim 1, further comprising:

receiving HSDPA data from a first cell;

determining that a measurement of a second cell is above a threshold;

transmitting a request corresponding to the measurement; and

receiving Multi-Point HSDPA data from the first cell as the primary serving cell and the second cell as the secondary serving cell.

4. The method of claim 3, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode, and

wherein the request corresponding to the measurement comprises an indication of Event 1A.

5. The method of claim 1, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell.

6. The method of claim 1, further comprising:

receiving Multi-Point HSDPA data from a first cell as the primary serving cell and a second cell as the secondary serving cell;

determining that a measurement of the secondary serving cell exceeds a measurement of the primary serving cell;

transmitting a request corresponding to the measurement; and

receiving Multi-Point HSDPA data from the second cell as the primary serving cell and the first cell as the primary serving cell.

7. The method of claim 6, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell;

and

wherein the request corresponding to the measurement comprises an indication of Event 1D.

8. The method of claim 1, further comprising:

transmitting an RRC Connection Request message including an information element indicating support for the Multi-Point HSDPA mode.

9. The method of claim 1, further comprising:

utilizing an identifier to indicate support for Multi-Point HSDPA, wherein the identifier comprises one of an International Mobile Subscriber Identity (IMSI) or a Packet Temporary Mobile Subscriber Identity (P-TMSI).

10. A method of wireless communication, comprising:

receiving Multi-Point HSDPA data from a primary serving cell and a secondary serving cell;

determining that a measurement of the secondary serving cell has fallen below a threshold;

transmitting a request corresponding to the measurement;

receiving an RRC message that excludes a downlink secondary cell information element; and

switching off a Multi-Point HSDPA mode such that an HS-DSCH is not received from the secondary serving cell.

11. The method of claim 10, further comprising:

removing the cell corresponding to the secondary serving cell from an Active Set.

12. The method of claim 10, wherein the request corresponding to the measurement comprises an indication of Event 1B.

13. The method of claim 10, further comprising:

transmitting an RRC Connection Request message including an information element indicating support for the Multi-Point HSDPA mode.

14. The method of claim 10, further comprising:

utilizing an identifier to indicate support for Multi-Point HSDPA, wherein the identifier comprises one of an International Mobile Subscriber Identity (IMSI) or a Packet Temporary Mobile Subscriber Identity (P-TMSI).

15. A method of wireless communication for a Radio Network Controller (RNC) that is capable of supporting a Multi-Point HSDPA mode utilizing a primary serving cell and a secondary serving cell, the method comprising:

transmitting an RRC message comprising an information element adapted to inform a UE that the secondary serving cell utilizes the same carrier frequency as that of the primary serving cell; and

receiving a response to the RRC message to confirm completion of a reconfiguration in accordance with the RRC message.

16. The method of claim 15, wherein the reconfiguration comprises:

reconfiguring a second radio link corresponding to a second Node B to set up the second radio link corresponding to the second Node B as a secondary serving cell in the Multi-Point HSDPA mode; and

reconfiguring a first radio link corresponding to a first Node B corresponding to a serving cell, to set up the first radio link corresponding to the first Node B as a primary serving cell in the Multi-Point HSDPA mode.

17. The method of claim 15, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode to transmit downlink data by way of the primary serving cell and the secondary serving cell.

18. The method of claim 15, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell, such that a first cell that acted as a former primary serving cell acts as a new secondary serving cell and a second cell that acted as a former secondary serving cell acts as a new primary serving cell.

19. The method of claim 18, further comprising:

continuing to receive data from the new primary serving cell that was previously queued at a Node B corresponding to the former secondary serving cell; and

continuing to receive data from the new secondary serving cell that was previously queued at a Node B corresponding to the former primary serving cell.

20. A User Equipment (UE) capable of a Multi-Point HSDPA mode utilizing a primary serving cell and a secondary serving cell, the UE comprising:

means for receiving an RRC message comprising an information element adapted to inform the UE that the secondary serving cell utilizes the same carrier frequency as that of the primary serving cell; and

means for transmitting a response to the RRC message to confirm completion of a reconfiguration in accordance with the RRC message.

21. The UE of claim 20, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode to receive downlink data from the primary serving cell and the secondary serving cell.

22. The UE of claim 20, further comprising:

means for receiving HSDPA data from a first cell;

means for determining that a measurement of a second cell is above a threshold;

means for transmitting a request corresponding to the measurement; and

means for receiving Multi-Point HSDPA data from the first cell as the primary serving cell and the second cell as the secondary serving cell.

23. The UE of claim 22, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode, and

wherein the request corresponding to the measurement comprises an indication of Event 1A.

24. The UE of claim 20, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell.

25. The UE of claim 20, further comprising:

means for receiving Multi-Point HSDPA data from a first cell as the primary serving cell and a second cell as the secondary serving cell;

means for determining that a measurement of the secondary serving cell exceeds a measurement of the primary serving cell;

means for transmitting a request corresponding to the measurement; and

means for receiving Multi-Point HSDPA data from the second cell as the primary serving cell and the first cell as the primary serving cell.

26. The UE of claim 25, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell;

and

wherein the request corresponding to the measurement comprises an indication of Event 1D.

27. The UE of claim 20, further comprising:

means for transmitting an RRC Connection Request message including an information element indicating support for the Multi-Point HSDPA mode.

28. The UE of claim 20, further comprising:

means for utilizing an identifier to indicate support for Multi-Point HSDPA, wherein the identifier comprises one of an International Mobile Subscriber Identity (IMSI) or a Packet Temporary Mobile Subscriber Identity (P-TMSI).

29. An apparatus for wireless communication, comprising:

means for receiving Multi-Point HSDPA data from a primary serving cell and a secondary serving cell;

means for determining that a measurement of the secondary serving cell has fallen below a threshold;

means for transmitting a request corresponding to the measurement;

means for receiving an RRC message that excludes a downlink secondary cell information element; and

means for switching off a Multi-Point HSDPA mode such that an HS-DSCH is not received from the secondary serving cell.

30. The apparatus of claim 29, further comprising:

means for removing the cell corresponding to the secondary serving cell from an Active Set.

31. The apparatus of claim 29, wherein the request corresponding to the measurement comprises an indication of Event 1B.

32. The apparatus of claim 29, further comprising:

means for transmitting an RRC Connection Request message including an information element indicating support for the Multi-Point HSDPA mode.

33. The apparatus of claim 29, further comprising:

means for utilizing an identifier to indicate support for Multi-Point HSDPA, wherein the identifier comprises one of an International Mobile Subscriber Identity (IMSI) or a Packet Temporary Mobile Subscriber Identity (P-TMSI).

34. A Radio Network Controller (RNC) capable of supporting a Multi-Point HSDPA mode utilizing a primary serving cell and a secondary serving cell, the RNC comprising:

means for transmitting an RRC message comprising an information element adapted to inform a UE that the secondary serving cell utilizes the same carrier frequency as that of the primary serving cell; and

means for receiving a response to the RRC message to confirm completion of a reconfiguration in accordance with the RRC message.

35. The RNC of claim 34, wherein the reconfiguration comprises:

means for reconfiguring a second radio link corresponding to a second Node B to set up the second radio link corresponding to the second Node B as a secondary serving cell in the Multi-Point HSDPA mode; and

means for reconfiguring a first radio link corresponding to a first Node B corresponding to a serving cell, to set up the first radio link corresponding to the first Node B as a primary serving cell in the Multi-Point HSDPA mode.

36. The RNC of claim 34, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode to transmit downlink data by way of the primary serving cell and the secondary serving cell.

37. The RNC of claim 34, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell, such that a first cell that acted as a former primary serving cell acts as a new secondary serving cell and a second cell that acted as a former secondary serving cell acts as a new primary serving cell.

38. The RNC of claim 37, further comprising:

means for continuing to receive data from the new primary serving cell that was previously queued at a Node B corresponding to the former secondary serving cell; and

means for continuing to receive data from the new secondary serving cell that was previously queued at a Node B corresponding to the former primary serving cell.

39. A processing system comprising:

at least one processor, and

a memory coupled to the at least one processor,

wherein the at least one processor is configured for use in a User Equipment (UE) that is capable of a Multi-Point HSDPA mode utilizing a primary serving cell and a secondary serving cell, the at least one processor further configured to;

receive an RRC message comprising an information element adapted to inform the UE that the secondary serving cell utilizes the same carrier frequency as that of the primary serving cell; and

transmit a response to the RRC message to confirm completion of a reconfiguration in accordance with the RRC message.

40. The at least one processor of claim 39, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode to receive downlink data from the primary serving cell and the secondary serving cell.

41. The processing system of claim 39, wherein the at least one processor is further configured to:

receive HSDPA data from a first cell;

determine that a measurement of a second cell is above a threshold;

transmit a request corresponding to the measurement; and

receive Multi-Point HSDPA data from the first cell as the primary serving cell and the second cell as the secondary serving cell.

42. The processing system of claim 41, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode, and wherein the request corresponding to the measurement comprises an indication of Event 1A.

43. The processing system of claim 39, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell.

44. The processing system of claim 39, wherein the at least one processor is further configured to:

receive Multi-Point HSDPA data from a first cell as the primary serving cell and a second cell as the secondary serving cell;

determine that a measurement of the secondary serving cell exceeds a measurement of the primary serving cell;

transmit a request corresponding to the measurement; and

receive Multi-Point HSDPA data from the second cell as the primary serving cell and the first cell as the primary serving cell.

45. The processing system of claim 44, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell;

and

wherein the request corresponding to the measurement comprises an indication of Event 1D.

46. The processing system of claim 39, wherein the at least one processor is further configured to:

transmit an RRC Connection Request message including an information element indicating support for the Multi-Point HSDPA mode.

47. The processing system of claim 39, wherein the at least one processor is further configured to:

utilize an identifier to indicate support for Multi-Point HSDPA, wherein the identifier comprises one of an International Mobile Subscriber Identity (IMSI) or a Packet Temporary Mobile Subscriber Identity (P-TMSI).

48. A processing system comprising:

at least one processor, and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to;

receive Multi-Point HSDPA data from a primary serving cell and a secondary serving cell;

determine that a measurement of the secondary serving cell has fallen below a threshold;

transmit a request corresponding to the measurement;

receive an RRC message that excludes a downlink secondary cell information element; and

switch off a Multi-Point HSDPA mode such that an HS-DSCH is not received from the secondary serving cell.

49. The processing system of claim 48, wherein the at least one processor is further configured to:

remove the cell corresponding to the secondary serving cell from an Active Set.

50. The processing system of claim 48, wherein the request corresponding to the measurement comprises an indication of Event 1B.

51. The processing system of claim 48, wherein the at least one processor is further configured to:

transmit an RRC Connection Request message including an information element indicating support for the Multi-Point HSDPA mode.

52. The processing system of claim 48, wherein the at least one processor is further configured to:

utilize an identifier to indicate support for Multi-Point HSDPA, wherein the identifier comprises one of an International Mobile Subscriber Identity (IMSI) or a Packet Temporary Mobile Subscriber Identity (P-TMSI).

53. A processing system comprising:

at least one processor, and

a memory coupled to the at least one processor,

wherein the at least one processor is configured for a Radio Network Controller (RNC) that is capable of supporting a Multi-Point HSDPA mode utilizing a primary serving cell and a secondary serving cell, the at least one processor further configured to;

transmit an RRC message comprising an information element adapted to inform a UE that the secondary serving cell utilizes the same carrier frequency as that of the primary serving cell; and

receive a response to the RRC message to confirm completion of a reconfiguration in accordance with the RRC message.

54. The processing system of claim 53, wherein the reconfiguration comprises:

reconfiguring a second radio link corresponding to a second Node B to set up the second radio link corresponding to the second Node B as a secondary serving cell in the Multi-Point HSDPA mode; and

reconfiguring a first radio link corresponding to a first Node B corresponding to a serving cell, to set up the first radio link corresponding to the first Node B as a primary serving cell in the Multi-Point HSDPA mode.

55. The processing system of claim 53, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode to transmit downlink data by way of the primary serving cell and the secondary serving cell.

56. The processing system of claim 53, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell, such that a first cell that acted as a former primary serving cell acts as a new secondary serving cell and a second cell that acted as a former secondary serving cell acts as a new primary serving cell.

57. The processing system of claim 56, wherein the at least one processor is further configured to:

continue to receive data from the new primary serving cell that was previously queued at a Node B corresponding to the former secondary serving cell; and

continue to receive data from the new secondary serving cell that was previously queued at a Node B corresponding to the former primary serving cell.

58. A computer program product, comprising:

a computer-readable medium configured for a User Equipment (UE) capable of a Multi-Point HSDPA mode utilizing a primary serving cell and a secondary serving cell, the computer-readable medium comprising;

code for causing a computer to receive an RRC message comprising an information element adapted to inform the UE that the secondary serving cell utilizes the same carrier frequency as that of the primary serving cell; and

code for causing a computer to transmit a response to the RRC message to confirm completion of a reconfiguration in accordance with the RRC message.

59. The computer program product of claim 58, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode to receive downlink data from the primary serving cell and the secondary serving cell.

60. The computer program product of claim 58, wherein the computer-readable medium further comprises:

code for causing a computer to receive HSDPA data from a first cell;

code for causing a computer to determine that a measurement of a second cell is above a threshold;

code for causing a computer to transmit a request corresponding to the measurement; and

code for causing a computer to receive Multi-Point HSDPA data from the first cell as the primary serving cell and the second cell as the secondary serving cell.

61. The computer program product of claim 60, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode, and

wherein the request corresponding to the measurement comprises an indication of Event 1A.

62. The computer program product of claim 58, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell.

63. The computer program product of claim 58, wherein the computer-readable medium further comprises:

code for causing a computer to receive Multi-Point HSDPA data from a first cell as the primary serving cell and a second cell as the secondary serving cell;

code for causing a computer to determine that a measurement of the secondary serving cell exceeds a measurement of the primary serving cell;

code for causing a computer to transmit a request corresponding to the measurement; and

code for causing a computer to receive Multi-Point HSDPA data from the second cell as the primary serving cell and the first cell as the primary serving cell.

64. The computer program product of claim 63, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell;

and

wherein the request corresponding to the measurement comprises an indication of Event 1D.

65. The computer program product of claim 58, wherein the computer-readable medium further comprises:

code for causing a computer to transmit an RRC Connection Request message including an information element indicating support for the Multi-Point HSDPA mode.

66. The computer program product of claim 58, wherein the computer-readable medium further comprises:

code for causing a computer to utilize an identifier to indicate support for Multi-Point HSDPA, wherein the identifier comprises one of an International Mobile Subscriber Identity (IMSI) or a Packet Temporary Mobile Subscriber Identity (P-TMSI).

67. A computer program product, comprising:

a computer-readable medium comprising;

code for causing a computer to receive Multi-Point HSDPA data from a primary serving cell and a secondary serving cell;

code for causing a computer to determine that a measurement of the secondary serving cell has fallen below a threshold;

code for causing a computer to transmit a request corresponding to the measurement;

code for causing a computer to receive an RRC message that excludes a downlink secondary cell information element; and

code for causing a computer to switch off a Multi-Point HSDPA mode such that an HS-DSCH is not received from the secondary serving cell.

68. The computer program product of claim 67, wherein the computer-readable medium further comprises:

code for causing a computer to remove the cell corresponding to the secondary serving cell from an Active Set.

69. The computer program product of claim 67, wherein the request corresponding to the measurement comprises an indication of Event 1B.

70. The computer program product of claim 67, wherein the computer-readable medium further comprises:

code for causing a computer to transmit an RRC Connection Request message including an information element indicating support for the Multi-Point HSDPA mode.

71. The computer program product of claim 67, wherein the computer-readable medium further comprises:

code for causing a computer to utilize an identifier to indicate support for Multi-Point HSDPA, wherein the identifier comprises one of an International Mobile Subscriber Identity (IMSI) or a Packet Temporary Mobile Subscriber Identity (P-TMSI).

72. A computer program product, comprising:

a computer-readable medium configured for a Radio Network Controller (RNC) that is capable of supporting a Multi-Point HSDPA mode utilizing a primary serving cell and a secondary serving cell, the computer-readable medium comprising;

code for causing a computer to transmit an RRC message comprising an information element adapted to inform a UE that the secondary serving cell utilizes the same carrier frequency as that of the primary serving cell; and

code for causing a computer to receive a response to the RRC message to confirm completion of a reconfiguration in accordance with the RRC message.

73. The computer program product of claim 72, wherein the reconfiguration comprises:

code for causing a computer to reconfigure a second radio link corresponding to a second Node B to set up the second radio link corresponding to the second Node B as a secondary serving cell in the Multi-Point HSDPA mode; and

code for causing a computer to reconfigure a first radio link corresponding to a first Node B corresponding to a serving cell, to set up the first radio link corresponding to the first Node B as a primary serving cell in the Multi-Point HSDPA mode.

74. The computer program product of claim 72, wherein the reconfiguration comprises a switching on of the Multi-Point HSDPA mode to transmit downlink data by way of the primary serving cell and the secondary serving cell.

75. The computer program product of claim 72, wherein the reconfiguration comprises a swapping of the primary serving cell with the secondary serving cell, such that a first cell that acted as a former primary serving cell acts as a new secondary serving cell and a second cell that acted as a former secondary serving cell acts as a new primary serving cell.

76. The computer program product of claim 75, wherein the computer-readable medium further comprises:

code for causing a computer to continue to receive data from the new primary serving cell that was previously queued at a Node B corresponding to the former secondary serving cell; and

code for causing a computer to continue to receive data from the new secondary serving cell that was previously queued at a Node B corresponding to the former primary serving cell.