Method and apparatus for uplink transmission power control and timing in coordinated multipoint transmission schemes

• US 9,204,399 B2
• Filed: 10/02/2012
• Issued: 12/01/2015
• Est. Priority Date: 10/03/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gaal, Peter, Chen, Wanshi, Montojo, Juan, Xu, Hao
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): CHAU, PETER P
• Application Number:
  US13/633,807
• Publication Number:
  US 20130083731A1
• Time in Patent Office: 1,155 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus of a first cell communicates with a second cell in relation to a coordinated multipoint (CoMP) transmission of control information by the first cell and data by the second cell to a user equipment (UE) in a range expanded region of the second cell, receives a desired transmission power level for the UE from the second cell, generates control information based on the desired transmission power level, and transmits the control information to the UE.

Claims

1. A method of wireless communication of a first cell, comprising:

transmitting disabling information to a user equipment (UE) indicating that open loop transmission power control (TPC) is to be disabled based on a range expansion status of the UE in a range expanded region of a second cell, wherein the range expansion status indicates a location of the UE with respect to the range expanded region of the second cell;

communicating with the second cell in relation to a coordinated multipoint (CoMP) transmission of control information by the first cell directly to the UE and data by the second cell directly to the UE in the range expanded region of the second cell;

receiving at the first cell a desired transmission power level for the UE from the second cell;

generating at the first cell control information based on the desired transmission power level; and

transmitting from the first cell the control information to the UE.

2. The method of claim 1, wherein the first cell and the second cell have a same cell identifier.

3. The method of claim 1, wherein the first cell is a high-power evolved Node B (eNB) and the second cell is a low-power eNB.

4. The method of claim 1, wherein:

receiving the desired transmission power level for the UE from the second cell comprises receiving information associated with a transmission power control (TPC) of the UE from the second cell; and

transmitting the control information to the UE comprises transmitting to the UE TPC information based on the received information associated with the TPC of the UE, the TPC information being for the UE for adjusting an uplink transmission power.

5. The method of claim 1, further comprising:

receiving information associated with a TPC of the UE from the second cell; and

communicating TPC information to the UE based on the received information associated with the TPC of the UE, the TPC information being for the UE for setting an uplink transmission power.

6. The method of claim 5, wherein the disabling information is for disabling open loop TPC for a physical uplink shared channel (PUSCH).

7. The method of claim 5, wherein the disabling information is for disabling open loop TPC for a physical uplink control channel (PUCCH).

8. The method of claim 5, further comprising determining whether the UE is in the range expanded region, wherein the disabling information is transmitted when the UE is in the range expanded region.

9. The method of claim 1, further comprising:

receiving information associated with a timing advance of the UE from the second cell; and

transmitting to the UE timing advance information based on the received information, the timing advance information being for the UE for adjusting an uplink timing with the second cell.

10. An apparatus for wireless communication in a first cell, comprising:

means for transmitting disabling information to a user equipment (UE) indicating that open loop transmission power control (TPC) is to be disabled based on a range expansion status of the UE in a range expanded region of a second cell, wherein the range expansion status indicates a location of the UE with respect to the range expanded region of the second cell;

means for communicating with the second cell in relation to a coordinated multipoint (CoMP) transmission of control information by the apparatus directly to the UE and data by the second cell directly to the UE in the range expanded region of the second cell;

means for receiving a desired transmission power level for the UE from the second cell;

means for generating control information based on the desired transmission power level; and

means for transmitting the control information to the UE.

11. The apparatus of claim 10, wherein the apparatus and the second cell have a same cell identifier.

12. The apparatus of claim 10, wherein the apparatus is a high-power evolved Node B (eNB) and the second cell is a low-power eNB.

13. The apparatus of claim 10, wherein:

the means for receiving the desired transmission power level for the UE from the second cell comprises receiving information associated with a transmission power control (TPC) of the UE from the second cell; and

the means for transmitting the control information to the UE comprises transmitting to the UE TPC information based on the received information associated with the TPC of the UE, the TPC information being for the UE for adjusting an uplink transmission power.

14. The apparatus of claim 10, further comprising:

means for receiving information associated with a TPC of the UE from the second cell; and

means for communicating TPC information to the UE based on the received information associated with the TPC of the UE, the TPC information being for the UE for setting an uplink transmission power.

15. The apparatus of claim 14, wherein the disabling information is for disabling open loop TPC for a physical uplink shared channel (PUSCH).

16. The apparatus of claim 14, wherein the disabling information is for disabling open loop TPC for a physical uplink control channel (PUCCH).

17. The apparatus of claim 14, further configured to determine whether the UE is in the range expanded region, wherein the disabling information is transmitted when the UE is in the range expanded region.

18. The apparatus of claim 10, further comprising:

means for receiving information associated with a timing advance of the UE from the second cell; and

means for transmitting to the UE timing advance information based on the received information, the timing advance information being for the UE for adjusting an uplink timing with the second cell.

19. A non-transitory computer-readable medium storing computer executable code for wireless communication, the non-transitory computer-readable medium comprising code for:

transmitting disabling information to a user equipment (UE) indicating that open loop transmission power control (TPC) is to be disabled based on a range expansion status of the UE in a range expanded region of a second cell, wherein the range expansion status indicates a location of the UE with respect to the range expanded region of the second cell;

communicating with the second cell in relation to a coordinated multipoint (CoMP) transmission of control information by the first cell directly to the UE and data by the second cell directly to the UE in the range expanded region of the second cell;

receiving at the first cell a desired transmission power level for the UE from the second cell;

generating at the first cell control information based on the desired transmission power level; and

transmitting from the first cell the control information to the UE.

20. The non-transitory computer-readable medium of claim 19, wherein the first cell and the second cell have a same cell identifier.

21. The non-transitory computer-readable medium of claim 19, wherein the first cell is a high-power evolved Node B (eNB) and the second cell is a low-power eNB.

22. The non-transitory computer-readable medium of claim 19, wherein:

the code for receiving the desired transmission power level for the UE from the second cell comprises code for receiving information associated with a transmission power control (TPC) of the UE from the second cell; and

the code for transmitting the control information to the UE comprises code for transmitting to the UE TPC information based on the received information associated with the TPC of the UE, the TPC information being for the UE for adjusting an uplink transmission power.

23. The non-transitory computer-readable medium of claim 19, further comprising code for:

receiving information associated with a TPC of the UE from the second cell; and

communicating TPC information to the UE based on the received information associated with the TPC of the UE, the TPC information being for the UE for setting an uplink transmission power.

24. The non-transitory computer-readable medium of claim 23, wherein the disabling information is for disabling open loop TPC for a physical uplink shared channel (PUSCH).

25. The non-transitory computer-readable medium of claim 23, wherein the disabling information is for disabling open loop TPC for a physical uplink control channel (PUCCH).

26. The non-transitory computer-readable medium of claim 23, the non-transitory computer-readable medium further comprising code for determining whether the UE is in the range expanded region, wherein the disabling information is transmitted when the UE is in the range expanded region.

27. The non-transitory computer-readable medium of claim 19 further comprising code for:

receiving information associated with a timing advance of the UE from the second cell; and

transmitting to the UE timing advance information based on the received information, the timing advance information being for the UE for adjusting an uplink timing with the second cell.

28. An apparatus for wireless communication, comprising:

a processing system configured to;

transmit disabling information to a user equipment (UE) indicating that open loop transmission power control (TPC) is to be disabled based on a range expansion status of the UE in a range expanded region of a second cell, wherein the range expansion status indicates a location of the UE with respect to the range expanded region of the second cell;

communicate with the second cell in relation to a coordinated multipoint (CoMP) transmission of control information by the apparatus directly to the UE and data by the second cell directly to the UE in the range expanded region of the second cell;

receive at the apparatus a desired transmission power level for the UE from the second cell;

generate at the apparatus control information based on the desired transmission power level; and

transmit from the apparatus the control information to the UE.

29. The apparatus of claim 28, wherein the apparatus and the second cell have a same cell identifier.

30. The apparatus of claim 28, wherein the apparatus is a high-power evolved Node B (eNB) and the second cell is a low-power eNB.

31. The apparatus of claim 28, wherein the processing system is further configured to:

receive the desired transmission power level for the UE from the second cell comprises receiving information associated with a transmission power control (TPC) of the UE from the second cell; and

transmit the control information to the UE comprises transmitting to the UE TPC information based on the received information associated with the TPC of the UE, the TPC information being for the UE for adjusting an uplink transmission power.

32. The apparatus of claim 28, wherein the processing system is further configured to:

receive information associated with a TPC of the UE from the second cell; and

communicate TPC information to the UE based on the received information associated with the TPC of the UE, the TPC information being for the UE for setting an uplink transmission power.

33. The apparatus of claim 32, wherein the disabling information is for disabling open loop TPC for a physical uplink shared channel (PUSCH).

34. The apparatus of claim 32, wherein the disabling information is for disabling open loop TPC for a physical uplink control channel (PUCCH).

35. The apparatus of claim 32, wherein the processing system is further configured to determine whether the UE is in the range expanded region, wherein the disabling information is transmitted when the UE is in the range expanded region.

36. The apparatus of claim 28, the processing system is further configured to:

receive information associated with a timing advance of the UE from the second cell; and

transmit to the UE timing advance information based on the received information, the timing advance information being for the UE for adjusting an uplink timing with the second cell.