Method of efficiently reporting user equipment transmission power and apparatus thereof

• US 9,648,571 B2
• Filed: 03/20/2015
• Issued: 05/09/2017
• 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): PHU, SANH D
• Application Number:
  US14/664,270
• Publication Number:
  US 20150195798A1
• Time in Patent Office: 781 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 transmitting or reporting a Power Headroom Report (PHR) of a User Equipment (UE) are provided. The method of transmitting the PHR of the UE in a mobile communication system includes configuring an extended PHR including an indicator corresponding to a variation factor of a maximum transmission power of the UE, and transmitting the extended PHR from the UE to a Base Station (BS). The BS may be notified of a maximum transmission power of the UE and a variation factor corresponding to the maximum transmission power in order to enable efficient scheduling.

Claims

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

receiving configuration information comprising a prohibit power headroom report (PHR) timer for a PHR and information indicating whether a PHR format for the UE is an extended PHR from a base station;

identifying whether the PHR format for the UE is the extended PHR based on the configuration information;

triggering, when the prohibit PHR timer is expired and the PHR format is the extended PHR, the PHR including a maximum transmission power generated based on a power management-maximum power reduction (P-MPR), a range between a upper bound of the maximum transmission power and a lower bound of the maximum transmission power and an indicator indicating whether the UE applies the P-MPR and transmitting the extended PHR to the base station; and

triggering, when the prohibit PHR timer is expired and the PHR format is not the extended PHR format, a normal PHR without the indicator and transmitting the normal PHR to the base station,

wherein the indicator is set to 1 if the maximum transmission power is different from a maximum transmission power not applying a power back-off due to the power management.

2. The method of claim 1, wherein the configuration information is received using a media access control-mainconfig information element (MAC-MainConfig IE).

3. The method of claim 1, wherein the maximum transmission power is determined by the UE according to a first parameter provided from the base station and a second parameter previously set by the UE.

4. The method of claim 1, wherein the indicator is set to 0 if the maximum transmission power is not different from a maximum transmission power not applying the power back-off due to the power management.

5. A user equipment (UE) in a wireless communication system, the UE comprising:

a controller configured to;

receive configuration information comprising a prohibit power headroom report (PHR) timer for a PHR and information indicating whether a PHR format for the UE is an extended PHR from a base station,

identify whether a PHR format for the UE is the extended PHR based on the configuration information,

trigger, when the prohibit PHR timer is expired and the PHR format is the extended PHR, the extended PHR including a maximum transmission power generated based on a power management-maximum power reduction (P-MPR), a range between a upper bound of the maximum transmission power, and a lower bound of the maximum transmission power and an indicator indicating whether the UE applies the P-MPR, and transmit the extended PHR to the base station, and

trigger, when the prohibit PHR timer is expired and the PHR format is not the extended PHR format, a normal PHR without the indicator and transmit the normal PHR to the base station,

wherein the indicator is set to 1 if the maximum transmission power is different from a maximum transmission power not applying a power back-off due to the power management.

6. The UE of claim 5, wherein the configuration information is received using a media access control-mainconfig information element (MAC-MainConfig IE).

7. The UE of claim 5, wherein the maximum transmission power is determined by the UE according to a first parameter provided from the base station and a second parameter previously set by the UE.

8. The UE of claim 5, wherein the indicator is set to 0 if the maximum transmission power is not different from a maximum transmission power not applying the power back-off due to the power management.