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

• US 9,210,666 B2
• Filed: 10/02/2012
• Issued: 12/08/2015
• 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
• Application Number:
  US13/633,795
• Publication Number:
  US 20130083730A1
• Time in Patent Office: 1,162 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 second cell and data by the first cell to a user equipment (UE) in a range expanded region of the first cell, determines a desired transmission power level for an uplink transmission to the first cell by the UE, and provides the desired transmission power level for the uplink transmission to the second cell.

Claims

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

disabling open loop power control based on a range expansion status of a user equipment (UE) in a range expanded region of the first cell, wherein the range expansion status indicates a location of the UE with respect to the range expanded region of the first cell;

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

determining by the first cell a desired transmission power level for an uplink transmission to the first cell by the UE; and

providing the desired transmission power level for the uplink transmission to the second cell.

2. The method of claim 1, wherein providing the desired transmission power level comprises providing transmission power control (TPC) information to the second cell, the TPC information being for the UE for setting a transmission power of the uplink transmission.

3. The method of claim 1, further comprising receiving an uplink transmission from the UE based in part on the CoMP transmission of control information by the second cell.

4. The method of claim 1, further comprising transmitting the control information to the UE, wherein the first cell and the second cell have a same cell identifier.

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

6. The method of claim 1, further comprising communicating timing advance information to the second cell based on a received uplink transmission from the UE, the timing advance information being for the UE for adjusting an uplink timing of the uplink transmission.

7. The method of claim 6, further comprising:

receiving a second uplink transmission from a second UE; and

adjusting a system timeline of the second cell in order to improve an alignment between the uplink transmission from the UE and the second uplink transmission from the second UE.

8. An apparatus for wireless communication of a first cell, comprising:

means for disabling open loop power control based on a range expansion status of a user equipment (UE) in a range expanded region of the first cell, wherein the range expansion status indicates a location of the UE with respect to the range expanded region of the first cell;

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

means for determining a desired transmission power level for an uplink transmission to the first cell by the UE; and

means for providing the desired transmission power level for the uplink transmission to the second cell.

9. The apparatus of claim 8, wherein the desired transmission power level comprises transmission power control (TPC) information, the TPC information being for the UE for setting a transmission power of the uplink transmission.

10. The apparatus of claim 8, further comprising means for receiving an uplink transmission from the UE based in part on the CoMP transmission of control information by the second cell.

11. The apparatus of claim 8, further comprising means for transmitting the control information to the UE, wherein the first cell and the second cell have a same cell identifier.

12. The apparatus of claim 8, wherein the first cell is a low-power evolved Node B (eNB) and the second cell is a high-power eNB.

13. The apparatus of claim 8, further comprising means for communicating timing advance information to the second cell based on a received uplink transmission from the UE, the timing advance information being for the UE for adjusting an uplink timing of the uplink transmission.

14. The apparatus of claim 13, further comprising:

means for receiving a second uplink transmission from a second UE; and

means for adjusting a system timeline of the second cell in order to improve an alignment between the uplink transmission from the UE and the second uplink transmission from the second UE.

15. A non-transitory computer-readable medium comprising code that when executed on at least one processor causes the at least one processor to:

disable open loop power control based on a range expansion status of a user equipment (UE) in a range expanded region of the first cell, wherein the range expansion status indicates a location of the UE with respect to the range expanded region of the first cell;

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

determine by the first cell a desired transmission power level for an uplink transmission to the first cell by the UE; and

provide the desired transmission power level for the uplink transmission to the second cell.

16. The non-transitory computer-readable medium of claim 15, wherein the code that when executed on the at least one processor causes the at least one processor to provide the desired transmission power level comprises code that when executed on the at least one processor causes the at least one processor to provide transmission power control (TPC) information to the second cell, the TPC information being for the UE for setting a transmission power of the uplink transmission.

17. The non-transitory computer-readable medium of claim 15, further comprising code that when executed on the at least one processor causes the at least one processor to receive an uplink transmission from the UE based in part on the CoMP transmission of control information by the second cell.

18. The non-transitory computer-readable medium of claim 15, further comprising code that when executed on the at least one processor causes the at least one processor to transmit the control information to the UE, wherein the first cell and the second cell have a same cell identifier.

19. The non-transitory computer-readable medium of claim 15, wherein the first cell is a low-power evolved Node B (eNB) and the second cell is a high-power eNB.

20. The non-transitory computer-readable medium of claim 15, further comprising code that when executed on the at least one processor causes the at least one processor to communicate timing advance information to the second cell based on a received uplink transmission from the UE, the timing advance information being for the UE for adjusting an uplink timing of the uplink transmission.

21. The non-transitory computer-readable medium of claim 20, further comprising code that when executed on the at least one processor causes the at least one processor to:

receive a second uplink transmission from a second UE; and

adjust a system timeline of the second cell in order to improve an alignment between the uplink transmission from the UE and the second uplink transmission from the second UE.

22. An apparatus for wireless communication of a first cell, comprising:

a processing system configured to;

disable open loop power control based on a range expansion status of a user equipment (UE) located in a range expanded region of the first cell, wherein the range expansion status indicates a location of the UE with respect to the range expanded region of the first cell;

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

determine by the first cell a desired transmission power level for an uplink transmission to the first cell by the UE; and

provide the desired transmission power level for the uplink transmission to the second cell.

23. The apparatus of claim 22, providing the desired transmission power level comprises providing transmission power control (TPC) information to the second cell, the TPC information being for the UE for setting a transmission power of the uplink transmission.

24. The apparatus of claim 22, wherein the processing system is further configured to receive an uplink transmission from the UE based in part on the CoMP transmission of control information by the second cell.

25. The apparatus of claim 22, wherein the processing system is further configured to transmit the control information to the UE, wherein the first cell and the second cell have a same cell identifier.

26. The apparatus of claim 22, wherein the first cell is a low-power evolved Node B (eNB) and the second cell is a high-power eNB.

27. The apparatus of claim 22, wherein the processing system is further configured to communicate timing advance information to the second cell based on a received uplink transmission from the UE, the timing advance information being for the UE for adjusting an uplink timing of the uplink transmission.

28. The apparatus of claim 27, wherein the processing system is further configured to:

receive a second uplink transmission from a second UE; and

adjust a system timeline of the second cell in order to improve an alignment between the uplink transmission from the UE and the second uplink transmission from the second UE.