Enhanced power headroom reporting in wireless communication networks

• US 9,681,401 B2
• Filed: 03/17/2011
• Issued: 06/13/2017
• Est. Priority Date: 03/17/2011
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Nory, Ravikiran, Kuchibhotla, Ravi, Love, Robert T.
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): HENSON, JAMAAL R
• Application Number:
  US13/050,743
• Publication Number:
  US 20120236735A1
• Time in Patent Office: 2,280 Days
• Field of Search: 370329, 370432, 370252, 370344, 455522, 455509, 375260
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/38 TPC being performed in particular situations

Abstract

A method in a wireless communication device includes determining a first configured maximum transmit power (P_CMAX) value corresponding to a first set of resource blocks (RBs) in a carrier for a subframe, wherein the first set of RBs includes less than a complete set of RBs constituting the carrier, determining a second P_CMAX value corresponding to a second set of RBs in the carrier for the subframe, wherein the first and second sets of RBs are of a common type and the second set of RBs is different from the first set of RBs and the second set of RBs includes less than the complete set of RBs constituting the carrier. A composite report for the subframe including the first and second P_CMAX values is then sent to a base station.

Claims

1. A method in a wireless communication device, the method comprising:

determining a first configured maximum transmit power (P_CMAX) value corresponding to a first set of resource blocks (RBs) having a first set of subcarriers in a carrier for a subframe, the first set of RBs including less than a complete set of RBs constituting the carrier;

determining a second P_CMAX value corresponding to a second set of RBs having a second set of subcarriers in the same carrier for the subframe, the first and second sets of RBs containing RBs of a common type, the second set of RBs different from the first set of RBs and the second set of RBs including less than the complete set of RBs constituting the carrier;

determining a difference between the first P_CMAX value corresponding to the first set of RBs having the first set of subcarriers in the carrier for the subframe and the second P_CMAX value corresponding to the second set of RBs having the second set of subcarriers in the same carrier for the subframe; and

sending a composite report for the subframe including at least the first P_CMAX value corresponding to the first set of RBs having the first set of subcarriers in the carrier for the subframe and the second P_CMAX value corresponding to the second set of RBs having the second set of subcarriers in the same carrier for the subframe to a base station in response to determining that the difference between the first P_CMAX value and the second P_CMAX value exceeds a threshold.

2. The method of claim 1 wherein the first and second sets of RBs are partially overlapping in the frequency domain.

3. The method of claim 1, wherein the first and second sets of RBs are different in the frequency domain.

4. The method of claim 1 further comprising sending an identification of the first and second sets of RBs to the base station.

5. The method of claim 1,

determining the first P_CMAX value for the first set of RBs for a first temporal portion of the subframe,

determining the second P_CMAX value for the second set of resource blocks (RBs) for a second temporal portion of the subframe,

wherein the first and second temporal portions of the subframe are non-overlapping.

6. The method of claim 1 further comprising sending the composite report to the base station in response to receiving an explicit request from the base station for an enhanced P_CMAX report.

7. The method of claim 6, receiving the explicit request from the base station within a physical downlink control channel (PDCCH) message or a medium access control (MAC) layer message or an radio resource control (RRC) message.

8. The method of claim 6, receiving the explicit request from the base station within a physical downlink control channel (PDCCH) message where the PDCCH message includes identification information identifying an uplink carrier, the first and second sets of RBs, and resource blocks on the uplink carrier on which the composite report is to be sent.

9. The method of claim 1,

wherein the second set of RBs does not overlap with the first set of RBs,

wherein the first and second sets of RBs constitute a complete set of physical uplink shared channel (PUSCH) RBs of the carrier.

10. The method of claim 9 further comprising:

communicating using a first radio access technology (RAT) on the carrier in the subframe;

communicating using a second RAT while communicating using the first RAT on the carrier in the subframe;

the first and second P_CMAX values for the first and second sets of RBs are for the first RAT on the carrier in the subframe, wherein only the first P_CMAX value for the first set of RBs is reduced by a particular power back-off value to satisfy power management requirements.

11. The method of claim 1 further comprising:

the first set of RBs includes at least two RBs,

determining the first P_CMAX value includes determining a P_CMAX value for each of the at least two RBs wherein the P_CMAX value for one of the at least two RBs is lower than a P_CMAX value for the other of the at least two RBs, and

sending the first P_CMAXvalue to the base station includes reporting only the lower P_CMAX value to the base station.

12. The method of claim 1 further comprising:

determining a first Power Headroom (PH) value corresponding to the first set of RBs;

determining a second PH value corresponding to the second set of RBs;

sending first PH value and the second PH value in the composite report.

13. The method of claim 1 wherein sending the composite report occurs during an initiation or termination of two simultaneous wireless device communication sessions.