Method and apparatus for saving power of user equipment in wireless communication system

• US 8,787,231 B2
• Filed: 02/21/2012
• Issued: 07/22/2014
• Est. Priority Date: 02/21/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jeong, Kyeongin, Kim, Soenghun
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): DUDA, ADAM K
• Application Number:
  US13/401,119
• Publication Number:
  US 20120213137A1
• Time in Patent Office: 882 Days
• Field of Search: 370/329, 370/252, 370/311, 370/315, 370/203, 370/248, 370/255, 370/310, 370/312, 370/330, 455/444, 455/501, 455/517, 455/522, 455/524, 455/574
• US Class Current: 370/311
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/02 Power saving arrangements in wired systems H04L12/12; signaling of mobile application services, e.g. low battery notifications H04W4/20
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 52/0212 managed by the network, e.g. network or access point is master and terminal is slave
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An apparatus and method for improved power saving in a User Equipment (UE) supporting enhanced Inter-Cell Interference Coordination/Time-domain ICIC (eICIC/Time-domain ICIC) are provided. The power saving method includes receiving control information including a reference pattern for a power saving mode from a base station, determining whether the terminal is configured to operate in the power saving mode, and determining, when the terminal is configured to operate in the power saving mode, whether to decode a downlink control channel according to the reference pattern.

Claims

1. A power saving method of a terminal in a wireless communication system in which transmit power control is performed in units of subframe, the method comprising:

receiving, by a transceiver, control information including a reference pattern for a power saving mode from a base station;

determining, by a controller, whether the terminal is configured to operate in the power saving mode; and

determining, by the controller, when the terminal is configured to operate in the power saving mode, whether to decode a downlink control channel according to the reference pattern,

wherein the reference pattern comprises Almost Blank Subframe (ABS) pattern information.

2. The power saving method of claim 1, wherein the control information comprises a power saving mode activation indicator.

3. The power saving method of claim 1 wherein the determining of whether to decode the downlink control channel comprises receiving or decoding the downlink control channel at a time corresponding to an Almost Blank Subframe (ABS) in the reference pattern.

4. The power saving method of claim 2, wherein the determining of whether to decode the downlink control channel comprises skipping receiving/decoding of the downlink control channel at a time corresponding to a subframe which is not an Almost Blank Subframe (ABS) in the reference pattern.

5. The power saving method of claim 2, further comprising skipping receiving of unicast data or control information from the base station at a time corresponding to an Almost Blank Subframe (ABS) in the reference pattern.

6. The power saving method of claim 1, wherein the control information comprises at least one comparison threshold value.

7. The power saving method of claim 6, wherein the determining of whether to decode the downlink control channel comprises:

comparing a channel measurement value transmitted to the base station with the threshold value; and

skipping, when the channel measurement value is less than the threshold value, receiving or decoding of the downlink control channel at an Almost Blank Subframe (ABS) in the reference pattern.

8. The power saving method of claim 7, wherein the determining of whether to decode the downlink control channel comprises performing, when the channel measurement value is equal to or greater than the threshold value, the receiving or decoding of the downlink channel in the ABS.

9. The power saving method of claim 1, wherein the reference pattern is configured in a bitmap format.

10. A terminal of a wireless communication system in which transmit power of the terminal is controlled in units of subframe, the terminal comprising:

a transceiver for transmitting and receiving signals respectively to and from a base station; and

a power controller for controlling reception of control information including a reference pattern for a power saving mode from a base station, for determining whether the terminal is configured to operate in the power saving mode, and for determining, when the terminal is configured to operate in the power saving mode, whether to decode downlink control channel according to the reference pattern,

wherein the reference pattern comprises Almost Blank Subframe (ABS) pattern information.

11. The terminal of claim 10, wherein the control information comprises a power saving mode activation indicator.

12. The terminal of claim 10, wherein the power controller controls receiving or decoding of the downlink control channel at a time corresponding to an Almost Blank Subframe (ABS) in the reference pattern.

13. The terminal of claim 11, wherein the power controller controls to skip receiving/decoding of the downlink control channel at a time corresponding to a subframe which is not an Almost Blank Subframe (ABS) in the reference pattern.

14. The terminal of claim 11, wherein the power controller controls to skip receiving of unicast data or control information from the base station at a time corresponding an Almost Blank Subframe (ABS) in the reference pattern.

15. The terminal of claim 10, wherein the control information comprises at least one comparison threshold value.

16. The terminal of claim 15, wherein the power controller controls to compare a channel measurement value transmitted to the base station with the threshold value and skip, when the channel measurement value is less than the threshold value, receiving or decoding of the downlink control channel at an Almost Blank Subframe (ABS) in the reference pattern.

17. The terminal of claim 15, wherein the power controller controls to perform, when the channel measurement value is equal to or greater than the threshold value, receiving or decoding of the downlink channel in the ABS.

18. The terminal of claim 10, wherein the reference pattern is configured in a bitmap format.