Method and device for reporting power headroom in mobile communication system for carrier aggregation

• US 9,686,706 B2
• Filed: 03/19/2013
• Issued: 06/20/2017
• Est. Priority Date: 03/19/2012
• Status: Expired

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jeong, Kyeong In, Jang, Jae Hyuk, Kim, Soeng Hun, Kim, Sang Bum, Lim, Han Na
• Primary Examiner(s): Ajayi, Joel
• Application Number:
  US14/384,123
• Publication Number:
  US 20150087296A1
• Time in Patent Office: 1,554 Days
• Field of Search: 455423
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/04 TPC
• 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 72/0473 the resource being transmission power

Abstract

Provided are a method and apparatus for reporting power headroom in a mobile communication system supporting carrier aggregation. A user equipment (UE) determines the maximum transmit power for each carrier and the maximum UE transmit power, and sends a power headroom report that contains power headroom for each carrier computed based on the maximum transmit power for the carrier and the maximum UE transmit power to a corresponding base station (ENB).

Claims

1. A method of terminal operation in a wireless communication system, the method comprising:

receiving a measurement configuration message from a first base station controlling a first cell using a first frequency band;

measuring a first reference signal of the first cell from the first base station;

measuring a second reference signal of a second cell using a second frequency band from a second base station based on the measurement configuration message; and

transmitting a measurement report comprising a measurement result of the first reference signal and a measurement result of the second reference signal to the first base station,

wherein the measurement configuration message includes pattern information comprising an indication of which subframes the second reference signal is to be transmitted in, a physical cell identity of the second cell and offset information for the second reference signal, and

wherein the first reference signal is transmitted in all subframes, and the second reference signal is transmitted in subframes identified based on the pattern information included in the measurement configuration message.

2. The method of claim 1, wherein the first reference signal is a cell reference signal (CRS), and the second reference signal is a channel state indication reference signal (CSI-RS).

3. A method of operation of a first base station in a wireless communication system, the method comprising:

transmitting a measurement configuration message to a terminal;

transmitting a first reference signal of a first cell which is controlled by the first base station on a first frequency band to the terminal; and

receiving a measurement report from the terminal,

wherein the measurement configuration message includes pattern information for a second reference signal of a second cell which is transmitted from a second base station using a second frequency band, a physical cell identity of the second cell and offset information for the second reference signal,

wherein the pattern information comprises an indication of which subframes the second reference signal is to be transmitted in;

wherein the measurement report comprises a measurement result of the first reference signal and a measurement result of the second reference signal, and

wherein the first reference signal is transmitted in all subframes, and the second reference signal is transmitted in subframes identified based on the pattern information included in the measurement configuration message.

4. The method of claim 3, wherein the first reference signal is a cell reference signal (CRS), and the second reference signal is a channel state indication reference signal (CSI-RS).

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

a transceiver configured to transmit and receive signals; and

a controller configured to control to;

receive a measurement configuration message from a first base station controlling a first cell using a first frequency band,

measure a first reference signal of the first cell from the first base station,

measure a second reference signal of a second cell using a second frequency band from a second base station based on the measurement configuration message, and

transmit a measurement report comprising a measurement result of the first reference signal and measurement result of the second reference signal to the first base station,

wherein the measurement configuration message includes pattern information comprising an indication of which subframes the second reference signal is to be transmitted in, a physical cell identity of the second cell and offset information for the second reference signal, and

wherein the first reference signal is transmitted in all subframes, and the second reference signal is transmitted in subframes identified based on the pattern information included in the measurement configuration message.

6. The terminal of claim 5, wherein the first reference signal is a cell reference signal (CRS), and the second reference signal is a channel state indication reference signal (CSI-RS).

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

a transceiver configured to transmit and receive signals; and

a controller configured to control to;

transmit a measurement configuration message to a terminal,

transmit a first reference signal of a first cell which is controlled by a first base station on a first frequency band to the terminal, and

receive measurement report from the terminal,

wherein the measurement configuration message includes pattern information for a second reference signal of a second cell which is transmitted from a second base station using a second frequency band, a physical cell identity of the second cell and offset information for the second reference signal,

wherein the pattern information comprises an indication of which subframes the second reference signal is to be transmitted in;

wherein the measurement report comprises a measurement result of the first reference signal and a measurement result of the second reference signal, and

wherein the first reference signal is transmitted in all subframes, and the second reference signal is transmitted in subframes identified based on pattern information included in the measurement configuration message.

8. The first base station of claim 7, wherein the first reference signal is a cell reference signal (CRS), and the second reference signal is a channel state indication reference signal (CSI-RS).