POWER SHARING AND POWER HEADROOM REPORTING IN DUAL CONNECTIVITY SCENARIOS

• US 20150282104A1
• Filed: 03/27/2015
• Published: 10/01/2015
• Est. Priority Date: 03/31/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: DAMNJANOVIC, Jelena, CHEN, Wanshi, DAMNJANOVIC, Aleksandar, GAAL, Peter
• Granted Patent: US 9,357,510 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• 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
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 88/12 Access point controller devices

Abstract

Certain aspects of the present disclosure provide procedures for power sharing, scaling, and power headroom reporting in dual connectivity operations. According to certain aspects, a method of wireless communication by a user equipment (UE) is provided. The method generally includes determining a maximum available transmit power of the UE, semi-statically configuring a first minimum guaranteed power available for uplink transmission to a first base station and a second minimum guaranteed power available for uplink transmission to a second base station, and dynamically determining a first maximum transmit power available for uplink transmission to the first base station and a second maximum transmit power available for uplink transmission to the second base station based, at least in part, on the maximum available transmit power of the UE, the first minimum guaranteed power, and the second minimum guaranteed power.

Claims

1. A method for wireless communication by a user equipment (UE), comprising:

determining a maximum available transmit power of the UE;

semi-statically configuring a first minimum guaranteed power available for uplink transmission to a first base station and a second minimum guaranteed power available for uplink transmission to a second base station; and

dynamically determining a first maximum transmit power available for uplink transmission to the first base station and a second maximum transmit power available for uplink transmission to the second base station based, at least in part, on the maximum available transmit power of the UE, the first minimum guaranteed power, and the second minimum guaranteed power.

2. The method of claim 1, wherein the semi-static configuring is via radio resource control (RRC) signaling.

3. The method of claim 1, wherein dynamically determining the first maximum transmit power and the second maximum transmit power comprises:

determining a sum of the first minimum guaranteed power and the second minimum guaranteed power is less than the maximum available transmit power of the UE, and

adding an amount of power to at least one of the first minimum guaranteed power or the second minimum guaranteed power such that the sum of the first maxim transmit power and the second maximum transmit power is less than or equal to the maximum available transmit power.

4. The method of claim 1, wherein dynamically determining the first maximum transmit power and the second maximum transmit power comprises:

determining an amount of the first minimum guaranteed power that is unused for uplink transmission to the first base station, and

including at least a portion of the unused amount when determining the second maximum transmit power available for uplink transmission to the second base station.

5. The method of claim 4, wherein the unused amount comprises an amount of the first minimum guaranteed power that is unused for transmission to the first base station on all uplink channels to be transmitted to the first base station.

6. The method of claim 1, wherein the first base station and the second base station operate asynchronously, and wherein dynamically determining the first maximum transmit power and the second maximum transmit power comprises:

determining a first amount of the first minimum guaranteed power that is unused for uplink transmission to the first base station during a first transmission time interval (TTI);

determining a second amount of the first minimum guaranteed power that is unused for uplink transmission to the first base station during a second TTI overlapping the first TTI; and

including at least a portion of the smaller of the first unused amount or the second unused amount when determining the second maximum transmit power.

7. The method of claim 1, wherein the first base station comprises a Master Evolved Node B (MeNB) or a Secondary eNB (SeNB) and the second base station comprises the other one of a MeNB or a SeNB.

8. The method of claim 1, wherein the semi-static configuring is based on a prioritization.

9. The method of claim 8, wherein the prioritization comprises allocating transmit power, in order of higher priority to lower priority, to:

a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) with uplink control information (UCI), and a PUSCH without UCI.

10. The method of claim 8, wherein the prioritization comprises allocating transmit power with a higher priority to channels for a Master Evolved Node B (MeNB) and with a lower priority to corresponding channels for a Secondary eNB (SeNB).

11. The method of claim 8, wherein the prioritization comprises allocating transmit power, in order of higher priority to lower priority, to:

a physical uplink control channel (PUCCH) for a Master Evolved Node B (MeNB), a PUCCH for a Secondary eNB (SeNB), a physical uplink shared channel (PUSCH) with uplink control information (UCI) for a MeNB, a PUSCH with UCI for a SeNB, and a PUSCH without UCI.

12. The method of claim 8, wherein the prioritization comprises allocating transmit power with a higher priority to a physical uplink shared channel (PUSCH) that carries traffic with a higher grade of service and with a lower priority to a PUSCH that carries traffic with a lower grade of service.

13. The method of claim 8, wherein the prioritization comprises uniformly distributing power for physical uplink shared channel (PUSCH) transmissions to the first base station and the second base station.

14. The method of claim 1, dynamically determining the first maximum transmit power and the second maximum transmit power comprises:

determining an amount of power such that a sum of the first maximum transmit power and the second maximum transmit power does not exceed the maximum available transmit power of the UE.

15. The method of claim 1, further comprising:

sending a power headroom report (PHR) to at least one of the first base station or the second base station indicating at least one of the first maximum transmit power or the second maximum transmit power.

16. An apparatus for wireless communications, comprising:

at least one processor configured to;

determine a maximum available transmit power of the apparatus,

semi-statically configure a first minimum guaranteed power available for uplink transmission to a first base station and a second minimum guaranteed power available for uplink transmission to a second base station, and

dynamically determine a first maximum transmit power available for uplink transmission to the first base station and a second maximum transmit power available for uplink transmission to the second base station based, at least in part, on the maximum available transmit power of the apparatus, the first minimum guaranteed power, and the second minimum guaranteed power; and

a memory coupled with the at least one processor.

17. The apparatus of claim 16, wherein the semi-static configuring is via radio resource control (RRC) signaling.

18. The apparatus of claim 16, wherein dynamically determining the first and second maximum transmit power comprises:

determining a sum of the first minimum guaranteed power and the second minimum guaranteed power is less than the maximum available transmit power of the apparatus, and

adding an amount of power to at least one of the first minimum guaranteed power or the second minimum guaranteed power such that the sum of the first maximum transmit power and the second maximum transmit power is less than or equal to the maximum available transmit power.

19. The apparatus of claim 16, wherein dynamically determining the first maximum transmit power and the second maximum transmit power comprises:

determining an amount of the first minimum guaranteed power that is unused for uplink transmission to the first base station, and

including at least a portion of the unused amount when determining the second maximum transmit power available for uplink transmission to the second base station.

20. The apparatus of claim 19, wherein the unused amount comprises an amount of the first minimum guaranteed power that is unused for transmission to the first base station on all uplink channels to be transmitted to the first base station.

21. The apparatus of claim 16, wherein the first base station and the second base station operate asynchronously, and wherein dynamically determining the first maximum transmit power and the second maximum transmit power comprises:

determining a first amount of the first minimum guaranteed power that is unused for uplink transmission to the first base station during a first transmission time interval (TTI);

determining a second amount of the first minimum guaranteed power that is unused for uplink transmission to the first base station during a second TTI overlapping the first TTI; and

including at least a portion of the smaller of the first unused amount or the second unused amount when determining the second maximum transmit power.

22. The apparatus of claim 16, wherein the first base station comprises a Master Evolved Node B (MeNB) or a Secondary eNB (SeNB) and the second base station comprises the other one of a MeNB or a SeNB.

23. The apparatus of claim 16, wherein the semi-static configuring is based on a prioritization.

24. The apparatus of claim 23, wherein the prioritization comprises allocating transmit power, in order of higher priority to lower priority, to:

a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) with uplink control information (UCI), and a PUSCH without UCI.

25. The apparatus of claim 23, wherein the prioritization comprises allocating transmit power with a higher priority to channels for a Master Evolved Node B (MeNB) and with a lower priority to corresponding channels for a Secondary eNB (SeNB).

26. The apparatus of claim 23, wherein the prioritization comprises allocating transmit power, in order of higher priority to lower priority, to:

a physical uplink control channel (PUCCH) for a Master Evolved Node B (MeNB), a PUCCH for a Secondary eNB (SeNB), a physical uplink shared channel (PUSCH) with uplink control information (UCI) for a MeNB, a PUSCH with UCI for a SeNB, and a PUSCH without UCI.

27. The apparatus of claim 23, wherein the prioritization comprises allocating transmit power with a higher priority to a physical uplink shared channel (PUSCH) that carries traffic with a higher grade of service and with a lower priority to a PUSCH that carries traffic with a lower grade of service.

28. The apparatus of claim 23, wherein the prioritization comprises uniformly distributing power for physical uplink shared channel (PUSCH) transmissions to the first base station and the second base station.

29. The apparatus of claim 16, dynamically determining the first maximum transmit power and the second maximum transmit power comprises:

determining an amount of power such that a sum of the first maximum transmit power and the second maximum transmit power does not exceed the maximum available transmit power of the apparatus.

30. The apparatus of claim 16, further comprising:

sending a power headroom report (PHR) to at least one of the first base station or the second base station indicating at least one of the first maximum transmit power or the second maximum transmit power.