ENHANCED HIGH-SPEED DOWNLINK SHARED CHANNEL SERVING CELL CHANGE PROCEDURES

• US 20100272268A1
• Filed: 03/25/2010
• Published: 10/28/2010
• Est. Priority Date: 03/27/2009
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kapoor, Rohit, Sambhwani, Sharad Deepak, Mohanty, Bibhu Prasad, Yavuz, Mehmet
• Application Number:
  US12/731,872
• Publication Number:
  US 20100272268A1
• Time in Patent Office: Days
• US Class Current: 380/287
• CPC Class Codes: H04W 36/0085 Hand-off measurements

Abstract

Serving cell change procedures are provided from a target cell that instructs a mobile device to change its serving cell to the target cell. Receiving the serving cell change instruction from the target cell can help mobile device to receive the instruction in areas were a signal from a current serving cell is rapidly deteriorating. An acknowledgement can be sent from mobile device to target cell and can be based on a scrambling code change and/or can be based on a CQI31.

Claims

1. A method for a serving cell change, comprising:

measuring a first pilot signal from a source node and a second pilot signal from a target node;

determining the second pilot signal is stronger than the first pilot signal;

sending measurements of the first pilot signal and the second pilot signal to an entity;

receiving an indication from the target node to switch to the target node; and

handing off to the target node based on the indication.

2. The method of claim 1, wherein the receiving includes receiving a physical layer indication from the target node.

3. The method of claim 1, further comprising:

receiving a first scrambling code and a second scrambling code from the entity;

using the first scrambling code to communicate with the source node prior to the measuring; and

switching from the first scrambling code to the second scrambling code after receiving the indication from the target node.

4. The method of claim 1, further comprising:

setting a subset of channel quality indicator bits to “

1”

; and

transmitting the subset of channel quality indicator bits, Acknowledgement (ACK) bits, or both the subset of channel quality indicator bits and ACK bits, to the target node in response to the indication.

5. The method of claim 4, wherein the setting comprises selecting the subset of channel quality indicator bits from a plurality of unused channel quality indicator bits.

6. The method of claim 1, wherein the receiving comprises receiving an order on a High Speed Shared Control Channel (HS-SCCH) that indicates the serving cell change.

7. The method of claim 1, wherein the receiving comprises receiving a serving cell change channel that indicates the serving cell change.

8. The method of claim 1, wherein the receiving comprises receiving a +1 on a non-serving Enhanced Dedicated Channel Relative Grant Channel (E-RGCH).

9. The method of claim 1, wherein the receiving comprises receiving a −

1 on a non-serving Enhanced Dedicated Channel Hybrid Automatic Repeat Request Acknowledgement Indicator Channel (E-HICH).

10. A wireless communications apparatus, comprising:

a memory that retains instructions related to measuring a first pilot signal from a source node and a second pilot signal from a target node, determining the second pilot signal is stronger than the first pilot signal, sending measurements of the first pilot signal and the second pilot signal to an entity, receiving an indication from the target node to switch to the target node, and handing off to the target node based on the indication and

a processor, coupled to the memory, configured to execute the instructions retained in the memory.

11. The wireless communications apparatus of claim 10, the memory retains further instructions related to toggling from a first scrambling code to a second scrambling code to handoff to the target node.

12. The wireless communications apparatus of claim 10, the memory retains further instructions related to identifying a set of unused channel quality indicator bits, setting the set of unused channel quality indicator bits to “

1”

, and transmitting the set of unused channel quality indicator bits as an acknowledgment.

13. The wireless communications apparatus of claim 10, wherein the instructions related to receiving comprise receiving a serving cell change channel that indicates a serving cell change.

14. The wireless communications apparatus of claim 10, wherein the instructions related to receiving comprise receiving a +1 on a non-serving E-RGCH.

15. The wireless communications apparatus of claim 10, wherein the instructions related to receiving comprise receiving a −

1 on a non-serving E-HICH.

16. A wireless communications apparatus that facilitates changes to a serving cell, comprising:

means for measuring signal strengths of cells in an active set that comprises the serving cell and a target cell;

means for determining from the signal strengths that a first signal strength of the serving cell is weaker than a second signal strength of the target cell;

means for sending a cell change request;

means for receiving a cell change confirm from the target cell; and

means for switching from the serving cell to the target cell.

17. The wireless communications apparatus of claim 16, further comprising:

means for obtaining a first scrambling code and a second scrambling code during a setup procedure;

means for using the first scrambling code to communicate with the serving cell; and

means for changing from the first scrambling code to the second scrambling code after the means for receiving receives the cell change confirm.

18. The wireless communications apparatus of claim 16, further comprising:

means for selecting a subset of unused channel quality indicator bits;

means for activating the subset of unused channel quality indicator bits; and

means for transmitting the subset of unused channel quality indicator bits to the target cell in response to the cell change confirm.

19. The wireless communications apparatus of claim 16, wherein the means for receiving comprises means for receiving a physical layer indication from the target cell.

20. The wireless communications apparatus of claim 16, wherein the means for receiving comprises a means for receiving a High Speed Shared Control Channel order.

21. A computer program product, comprising:

a computer-readable medium comprising;

a first set of codes for causing a computer to measure pilot signals of nodes included in an active set, wherein the active set comprises a source node and at least one target node;

a second set of codes for causing the computer to determine from the pilot signals that a pilot signal of the source node is weaker than at least one pilot signal of the at least one target node;

a third set of codes for causing the computer to request a handoff from the source node to the at least one target node;

a fourth set of codes for causing the computer to receive a handoff confirmation from the at least one target node;

a fifth set of codes for causing the computer to acknowledge the handoff confirmation; and

a sixth set of codes for causing the computer to handoff from the source node to the at least one target node.

22. The computer program product of claim 21, the computer-readable medium further comprising:

a seventh set of codes for causing the computer to toggle from a first scrambling code to a second scrambling code; and

an eighth set of codes for causing the computer to use the second scrambling code to communicate with the at least one target node.

23. The computer program product of claim 21, the computer-readable medium further comprising:

a seventh set of codes for causing the computer to activate a subset of unused channel quality indicator bits; and

an eighth set of codes for causing the computer to transmit the subset of unused channel quality indicator bits to the at least one target node in response to the handoff confirmation.

24. At least one processor configured to facilitate a serving cell change, comprising:

a first module for measuring a first pilot signal from a source node and a second pilot signal from a target node;

a second module that determines the second pilot signal is stronger than the first pilot signal;

a third module that sends measurements of the first pilot signal and the second pilot signal to an entity;

a fourth module that receives an indication from the target node to switch to the target node; and

a fifth module that hands off to the target node based on the indication.

25. The at least one processor of claim 24, further comprising:

a sixth module that receives a first scrambling code and a second scrambling code from the entity;

a seventh module that uses the first scrambling code to communicate with the source node before the first module measures the first pilot signal and the second pilot signal; and

an eighth module that switches from the first scrambling code to the second scrambling code after the fourth module receives the indication.

26. The at least one processor of claim 24, further comprising:

a sixth module that sets a subset of channel quality indicator bits to “

1”

; and

a seventh module that transmits the subset of channel quality indicator bits, acknowledgement (ACK) bits, or both the subset of channel quality indicator bits and the ACK bits, to the target node in response to the indication.

27. A method performed by a target node for a serving cell change, comprising:

receiving from a network a notification that a serving cell of a mobile device is to change from a source node to the target node;

sending an indication to the mobile device that notifies the mobile device of the serving cell change; and

detecting the mobile device handed off to the target node.

28. The method of claim 27, wherein the sending comprises creating a channel to indicate the serving cell change and sending the channel with the indication.

29. The method of claim 28, further comprising sending the channel on a channelization code used by an Enhanced Dedicated Channel Relative Grant Channel (E-RGCH) or an Enhanced Dedicated Channel Hybrid Automatic Repeat Request Acknowledgement Indicator Channel (E-HICH) with a signature sequence that is different than the signature sequence used by the E-RGCH or the E-HICH.

30. The method of claim 27, wherein the sending comprises sending a +1 on a non-serving E-RGCH.

31. The method of claim 27, wherein the sending comprises sending a −

1 on a non-serving E-HICH.

32. The method of claim 27, wherein the detecting further comprising:

detecting the mobile device changed from a first scrambling code to a second scrambling code; and

transmitting to the network a cell change complete message.

33. The method of claim 27, wherein the detecting further comprising:

receiving from the mobile device a subset of channel quality indicator bits that are set to “

1”

, acknowledgement (ACK) bits, or both the subset of channel quality indicator bits and the ACK bits; and

transmitting to the network a cell change complete message.

34. A wireless communications apparatus, comprising:

a memory that retains instructions related to receiving from a radio network controller a radio resource control message that indicates a serving cell of a mobile device is to be changed to the wireless communications apparatus, transmitting a cell change indicator to the mobile device, and determining the mobile device changed to the wireless communications apparatus; and

a processor, coupled to the memory, configured to execute the instructions retained in the memory.

35. The wireless communications apparatus of claim 34, the memory retains further instructions related to creating a channel to indicate a serving cell change to the mobile device and using the channel as the cell change indicator.

36. The wireless communications apparatus of claim 35, the memory retains further instructions related to sending the channel on a channelization code used by an E-RGCH or an E-HICH with a signature sequence that is different than the signature sequence of the E-RGCH or the E-HICH.

37. The wireless communications apparatus of claim 34, wherein the instructions related to transmitting comprise sending a −

1 on a non-serving E-HICH.

38. The wireless communications apparatus of claim 34, wherein the instructions related to transmitting comprise sending a +1 on a non-serving E-RGCH.

39. A wireless communications apparatus that performs a serving cell change, comprising:

means for receiving an indication that a serving cell of a mobile device is to be changed to the wireless communications apparatus;

means for notifying the mobile device of the serving cell change;

means for detecting a completion of the serving cell change; and

means for informing a network entity of the completion.

40. The wireless communications apparatus of claim 39, wherein the means for notifying comprises means for sending a High Speed Shared Control Channel order to the mobile device.

41. The wireless communications apparatus of claim 39, wherein the means for detecting comprises means for measuring a change from a first scrambling code to a second scrambling code and means for determining the mobile device has switched from the first scrambling code to the second scrambling code.

42. The wireless communications apparatus of claim 39, wherein the means for detecting comprising means for receiving from the mobile device a subset of unused channel quality indicators bits set to “

1”

, acknowledgement (ACK) bits, or both the subset of unused channel quality indicator bits and the ACK bits.

43. A computer program product, comprising:

a computer-readable medium comprising;

a first set of codes for causing a computer to receive from a radio network controller a radio resource control message that indicates a serving cell of a mobile device is to be changed to wireless communications apparatus;

a second set of codes for causing the computer to transmit a cell change indicator to the mobile device; and

a third set of codes for causing the computer to determine the wireless communications apparatus is serving the mobile device.

44. The computer program product of claim 43, the computer-readable medium further comprises a fourth set of codes for causing the computer to create a channel to indicate a serving cell change and using the channel as the cell change indicator.

45. The computer program product of claim 44, the computer-readable medium further comprises a fifth set of codes for causing the computer to send the channel on a channelization code used by an E-RGCH or an E-HICH with a signature sequence that is different than the signature sequence of the E-RGCH or the E-HICH.

46. At least one processor configured to facilitate serving cell changes, comprising:

a first module that receives from a network a notification that the serving cell of a mobile device is to change from a source node to a target node;

a second module that sends an indication to the mobile device that notifies the mobile device of a serving cell change; and

a third module that detects the mobile device handed off to the target node.

47. The at least one processor of claim 46, further comprising:

a fourth module that receives from the mobile device a subset of unused channel quality indicator bits set to “

1”

, acknowledgement (ACK) bits, or both the subset of unused channel quality indicator bits and the ACK bits; and

a fifth module that transmits to the network a cell change complete message.

48. The at least one processor of claim 46, further comprising:

a fourth module that detects the mobile device has changed from a first scrambling code to a second scrambling code; and

a fifth module that transmits to the network a cell change complete message.