POWER HEADROOM REPORT METHOD AND APPARATUS OF UE

• US 20180310259A1
• Filed: 06/29/2018
• Published: 10/25/2018
• Est. Priority Date: 02/15/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd., Tigerconnect Inc.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Soeng Hun, VAN LIESHOUT, Gert-Jan
• Granted Patent: US 10,575,265 B2
• Time in Patent Office: Days
• 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 52/54 Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 52/545 modifying TPC bits in special situations
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.

• • An improved method and an apparatus for reporting Power Headroom (PH) of a UE are provided. The Power Headroom Report (PHR) method of the present invention includes determining whether to trigger PHR based on a change of Power Management Maximum Power Reduction (P-MPR) between two time points, generating, if PHR is determined to be triggered, Power Headroom, and reporting the Power Headroom information to a base station.

Claims

1. A method for reporting a power headroom (PH) by a terminal in a wireless communication system, the method comprising:

transmitting a first power headroom report (PHR) based on a first uplink resource allocated to a serving cell;

determining whether a second uplink resource is allocated to the serving cell;

identifying whether power backoff due to power management is changed more than a threshold since a transmission of the first PHR, if the second uplink resource is allocated to the serving cell; and

transmitting, to a base station, a second PHR based on the second uplink resource if the power backoff due to the power management is changed more than the threshold since the transmission of the first PHR,

wherein the first PHR and the second PHR are based on a first type PHR of the first type PHR and a second type PHR, and

wherein the first type PHR includes a PH for each of at least one serving cell and bitmap information indicating a serving cell for which the PH is to be reported.

2. The method of claim 1,

wherein the first type PHR includes a first field for indicating whether or not the power backoff due to the power management is applied, and

wherein the first field corresponds to a first bit of an octet including the PH in the first type PHR.

3. The method of claim 2,

wherein the first field is set to 1 if the power backoff due to the power management is applied, and

wherein the first field is set to 0 if the power backoff due to the power management is not applied.

4. The method of claim 2, wherein the first type PHR further includes a second field for indicating whether a PH value corresponding to the PH is based on a real transmission.

5. The method of claim 4, wherein the second field is set to 0 if the PH value is based on the real transmission.

6. The method of claim 1, further comprising calculating uplink transmit power before determining whether to transmit the PHR,

wherein the calculating of the uplink transmit power comprises determining a minimum value between a maximum transmit power and a required transmit power as the uplink transmit power,

wherein the required transmit power is calculated based on at least one of a number of transmission resource blocks, a transmission format, or a pathloss, and

wherein the maximum transmit power is a value selected between an upper bound (P_{CMAX H}) and a lower bound (P_{CMAX L}) that are determined by following equations:

P_{CMAX_L}=MIN{P_EMAX−

T_C, P_PowerClass−

MAX(MPR+A-MPR, P-MPR)−

T_C},

P_{CMAX_H}=MIN{P_EMAX, P_PowerClass}

where P_EMAX is a maximum allowed terminal output power provided by the base station, P_PowerClass is a maximum available terminal power, Δ

T_C is a parameter for allowing additional transmission power relaxation when uplink transmission is performed at an edge of a frequency band.

7. A terminal for reporting a power headroom (PH) in a wireless communication system, the terminal comprising:

a transceiver; and

a controller coupled with the transceiver and configured to control to;

transmit a first power headroom report (PHR) based on a first uplink resource allocated to a serving cell;

determine whether a second uplink resource is allocated to the serving cell;

identify whether power backoff due to power management is changed more than a threshold since a transmission of the first PHR, if the second uplink resource is allocated to the serving cell; and

transmit, to a base station, a second PHR based on the second uplink resource if the power backoff due to the power management is changed more than the threshold since the transmission of the first PHR,

wherein the first PHR and the second PHR are based on a first type PHR of the first type PHR and a second type PHR, and

wherein the first type PHR includes a PH for each of at least one serving cell and bitmap information indicating a serving cell for which the PH is to be reported.

8. The terminal of claim 7,

wherein the first type PHR includes a first field for indicating whether or not the power backoff due to the power management is applied, and

wherein the first field corresponds to a first bit of an octet including the PH in the first type PHR.

9. The terminal of claim 8,

wherein the first field is set to 1 if the power backoff due to the power management is applied, and

wherein the first field is set to 0 if the power backoff due to the power management is not applied.

10. The terminal of claim 8, wherein the first type PHR further includes a second field for indicating whether a PH value corresponding to the PH is based on a real transmission.

11. The terminal of claim 10, wherein the second field is set to 0 if the PH value is based on the real transmission.

12. The terminal of claim 7, further comprising calculating uplink transmit power before determining whether to transmit the PHR,

wherein the calculating of the uplink transmit power comprises determining a minimum value between a maximum transmit power and a required transmit power as the uplink transmit power,

wherein the required transmit power is calculated based on at least one of a number of transmission resource blocks, a transmission format, or a pathloss, and

wherein the maximum transmit power is a value selected between an upper bound (P_{CMAX_H}) and a lower bound (P_{CMAX_L}) that are determined by following equations:

P_{CMAX_L}=MIN{P_EMAX−

T_C, P_PowerClass−

MAX(MPR+A-MPR, P-MPR)−

T_C},

P_{CMAX_H}=MIN{P_EMAX, P_PowerClass}

where P_EMAX is a maximum allowed terminal output power provided by the base station, P_PowerClass is a maximum available terminal power, Δ

T_C is a parameter for allowing additional transmission power relaxation when uplink transmission is performed at an edge of a frequency band.

13. A method for receiving a power headroom (PH) by a base station in a wireless communication system, the method comprising:

receiving, from a terminal, a first power headroom report (PHR) based on a first uplink resource allocated to a serving cell; and

receiving, from the terminal, a second PHR based on a second uplink resource allocated to the serving cell if the power backoff due to the power management of the terminal is changed more than the threshold since the transmission of the first PHR,

wherein it is identified by the terminal whether the power backoff due to the power management is changed more than the threshold since the transmission of the first PHR,

wherein the first PHR and the second PHR are based on a first type PHR of the first type PHR and a second type PHR, and

wherein the first type PHR includes a PH for each of at least one serving cell and bitmap information indicating a serving cell for which the PH is to be reported.

14. The method of claim 13,

wherein the first type PHR includes a first field for indicating whether or not the power backoff due to the power management is applied, and

wherein the first field corresponds to a first bit of an octet including the PH in the first type PHR.

15. The method of claim 14,

wherein the first field is set to 1 if the power backoff due to the power management is applied, and

wherein the first field is set to 0 if the power backoff due to the power management is not applied.

16. The method of claim 14, wherein the first type PHR further includes a second field for indicating whether a PH value corresponding to the PH is based on a real transmission.

17. The method of claim 16, wherein the second field is set to 0 if the PH value is based on the real transmission.

18. A base station for receiving a power headroom (PH) in a wireless communication system, the base station comprising:

a transceiver; and

a controller coupled with the transceiver and configured to control to;

receive, from a terminal, a first power headroom report (PHR) based on a first uplink resource allocated to a serving cell, and

receive, from the terminal, a second PHR based on a second uplink resource allocated to the serving cell if the power backoff due to the power management of the terminal is changed more than the threshold since the transmission of the first PHR,

wherein it is identified by the terminal whether the power backoff due to the power management is changed more than the threshold since the transmission of the first PHR,

wherein the first PHR and the second PHR are based on a first type PHR of the first type PHR and a second type PHR, and

wherein the first type PHR includes a PH for each of at least one serving cell and bitmap information indicating a serving cell for which the PH is to be reported.

19. The base station of claim 18,

wherein the first type PHR includes a first field for indicating whether or not the power backoff due to the power management is applied, and

wherein the first field corresponds to a first bit of an octet including the PH in the first type PHR.

20. The base station of claim 19,

wherein the first field is set to 1 if the power backoff due to the power management is applied, and

wherein the first field is set to 0 if the power backoff due to the power management is not applied.

21. The base station of claim 20, wherein the first type PHR further includes a second field for indicating whether a PH value corresponding to the PH is based on a real transmission.

22. The base station of claim 21, wherein the second field is set to 0 if the PH value is based on the real transmission.