Method of efficiently reporting user equipment transmission power and apparatus thereof

• US 10,667,223 B2
• Filed: 03/19/2019
• Issued: 05/26/2020
• Est. Priority Date: 02/21/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Sang Bum, Kim, Soeng Hun, Van Lieshout, Gert-Jan, Jeong, Kyeong In
• Primary Examiner(s): Nguyen, Lee
• Application Number:
  US16/357,942
• Publication Number:
  US 20190215787A1
• Time in Patent Office: 434 Days
• Field of Search: 455522, 455 6711, 4552261, 455 631, 4551271
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/545 modifying TPC bits in special situations
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• 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 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and an apparatus for efficiently reporting user equipment (UE) are provided. A method of transmitting Power Headroom Report (PHR) of UE in a mobile communication system, includes configuring an evolved PHR including an indicator with respect of a variation factor of maximum transmission power of the UE, and transmitting the evolved PHR to an eNB. An eNB may know maximum transmission power of an UE and a variation factor thereof to enable efficient scheduling.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising:

identifying whether the terminal has an uplink resource for a new transmission;

in case that the terminal has the uplink resource for the new transmission, identifying whether a power headroom report (PHR) prohibit timer expires and a power backoff due to power management is changed by more than a threshold;

in case that the PHR prohibit timer expires and the power backoff due to power management is changed by more than the threshold, generating a PHR including information on a power headroom (PH); and

transmitting the PHR to a base station in the wireless communication system,

wherein the PHR further includes information indicating whether the terminal applies the power backoff due to power management, in case that the PHR is associated with multiple serving cells, and

wherein the PHR does not include information on a maximum transmission power for an activated serving cell, in case that an uplink grant for the activated serving cell is not received by the terminal.

2. The method of claim 1,

wherein the activated serving cell is a first activated serving cell,

wherein the information on the PH included in the PHR is for the first activated serving cell, and

wherein the PHR further includes information on a PH and information on a maximum transmission power for a second activated serving cell, in case that an uplink grant for the second activated serving cell is received by the terminal.

3. The method of claim 1, wherein the PHR does not include the information indicating whether the terminal applies the power backoff in case that the PHR is associated with a single serving cell.

4. The method of claim 1, wherein the power backoff due to power management is associated with power management-maximum power reduction (P-MPR), and the PHR is triggered in case that the PHR prohibit timer expires and the power backoff due to power management associated with P-MPR is changed by more than the threshold since a last transmission of a PHR when an uplink resource was allocated.

5. The method of claim 1, further comprising:

receiving PHR configuration information including the threshold from the base station.

6. A terminal in a wireless communication system, the terminal comprising:

a transceiver; and

a controller configured to;

identify whether the terminal has an uplink resource for a transmission,

if the terminal has the uplink resource for the transmission, identify whether a power headroom report (PHR) prohibit timer expires and a power backoff due to power management is changed by more than a threshold,

if the PHR prohibit timer expires and the power backoff due to a power management is changed by more than the threshold, generate a PHR including a power headroom (PH), wherein the PHR further includes information indicating whether the terminal applies the power backoff due to power management if the PHR is associated with multiple serving cells, and the PHR does not include information on a maximum transmission power for an activated serving cell if an uplink grant for the activated serving cell is not received by the terminal, and

transmit, via the transceiver, the PHR to a base station in the wireless communication system.

7. The terminal of claim 6,

wherein the activated serving cell is a first activated serving cell,

wherein the information on the PH included in the PHR is for the first activated serving cell, and

wherein the PHR further includes information on a PH and information on a maximum transmission power for a second activated serving cell if an uplink grant for the second activated serving cell is received by the terminal.

8. The terminal of claim 6, wherein the PHR does not include the information indicating whether the terminal applies the power backoff if the PHR is associated with a single serving cell.

9. The terminal of claim 6, wherein the power backoff due to power management is associated with power management-maximum power reduction (P-MPR), and the PHR is triggered if the PHR prohibit timer expires and the power backoff due to power management associated with P-MPR is changed by more than the threshold since a last transmission of a PHR when an uplink resource was allocated.

10. The terminal of claim 6, wherein the controller is further configured to:

receive, via the transceiver, PHR configuration information including the threshold from the base station.

11. A method performed by a base station in a wireless communication system, the method comprising:

transmitting power headroom report (PHR) configuration information including a threshold to a terminal in the wireless communication system; and

receiving a PHR including information on a power headroom (PH) from the terminal,

wherein the PHR is triggered in case that the terminal has an uplink resource for a new transmission and that a PHR prohibit timer expires and a power backoff due to power management is changed by more than the threshold,

wherein the PHR further includes information indicating whether the terminal applies the power backoff due to power management, in case that the PHR is associated with multiple serving cells, and

wherein the PHR does not include information on a maximum transmission power for an activated serving cell, in case that an uplink grant for the first activated serving cell is not received by the terminal.

12. The method of claim 11,

wherein the activated serving cell is a first activated serving cell,

wherein the information on the PH included in the PHR is for the first activated serving cell, and

wherein the PHR further includes information on a PH and information on a maximum transmission power for a second activated serving cell, in case that an uplink grant for the second activated serving cell is received by the terminal.

13. The method of claim 11, wherein the PHR does not include the information indicating whether the terminal applies the power backoff in case that the PHR is associated with a single serving cell.

14. The method of claim 11, wherein the power backoff due to power management is associated with a power management-maximum power reduction (P-MPR), and the PHR is triggered in case that the PHR prohibit timer expires and the power backoff due to power management associated with P-MPR is changed by more than the threshold since a last transmission of a PHR when an uplink resource was allocated.

15. The method of claim 11, wherein the power backoff due to power management is associated with power management-maximum power reduction (P-MPR), and the information indicating whether the terminal applies the power backoff indicates whether the power backoff is involved in determining the maximum transmission power.

16. A base station in a wireless communication system, the base station comprising:

a transceiver; and

a controller configured to;

transmit, via the transceiver, power headroom report (PHR) configuration information including a threshold to a terminal in the wireless communication system, and

receive, via the transceiver, a PHR including a power headroom (PH) from the terminal,

wherein the PHR is triggered if the terminal has an uplink resource for a transmission and if a PHR prohibit timer expires and a power backoff due to power management is changed by more than the threshold,

wherein the PHR further includes information indicating whether the terminal applies the power backoff due to power management, if the PHR is associated with multiple serving cells, and

wherein the PHR does not include information on a maximum transmission power for an activated serving cell, if an uplink grant for the activated serving cell is not received by the terminal.

17. The base station of claim 16,

wherein the activated serving cell is a first activated serving cell,

wherein the information on the PH included in the PHR is for the first activated serving cell, and

wherein the PHR further includes information on a PH and information on a maximum transmission power for a second activated serving cell, if an uplink grant for the second activated serving cell is received by the terminal.

18. The base station of claim 16, wherein the PHR does not include the information indicating whether the terminal applies the power backoff, if the PHR is associated with a single serving cell.

19. The base station of claim 16, wherein the power backoff due to power management is associated with power management-maximum power reduction (P-MPR), and the PHR is triggered if the PHR prohibit timer expires and the power backoff due to power management associated with P-MPR is changed by more than the threshold since a last transmission of a PHR when an uplink resource was allocated.

20. The base station of claim 16, wherein the power backoff due to power management is associated with power management-maximum power reduction (P-MPR), and the information indicating whether the terminal applies the power backoff indicates whether the power backoff is involved in determining the maximum transmission power.