# US 8,787,231 B2 · Method and apparatus for saving power of user equipment in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,231 B2 - Document ID: US8787231B2 - Status: Granted - Kind: B2 - Application number: 13/401,119 - Filed: 2012-02-21 - Published: 2012-08-23 - Granted: 2014-07-22 - Earliest claimed: 2011-02-21 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Kyeongin Jeong; Soenghun Kim - Inventors: Kyeongin Jeong; Soenghun Kim - Web page: https://patentgrep.com/patent/US8787231B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 52/0209: {in terminal devices} - H04W 52/0212: {managed by the network, e.g. network or access point is leader and terminal is follower} - H04W 52/0235: {where the received signal is a power saving command} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 52/02: Power saving arrangements - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## 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 ### Claim 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. ### Claim 2 (depends on 1) The power saving method of claim 1, wherein the control information comprises a power saving mode activation indicator. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 2) 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. ### Claim 5 (depends on 2) 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. ### Claim 6 (depends on 1) The power saving method of claim 1, wherein the control information comprises at least one comparison threshold value. ### Claim 7 (depends on 6) 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. ### Claim 8 (depends on 7) 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. ### Claim 9 (depends on 1) The power saving method of claim 1, wherein the reference pattern is configured in a bitmap format. ### Claim 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. ### Claim 11 (depends on 10) The terminal of claim 10, wherein the control information comprises a power saving mode activation indicator. ### Claim 12 (depends on 10) 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. ### Claim 13 (depends on 11) 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. ### Claim 14 (depends on 11) 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. ### Claim 15 (depends on 10) The terminal of claim 10, wherein the control information comprises at least one comparison threshold value. ### Claim 16 (depends on 15) 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. ### Claim 17 (depends on 15) 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. ### Claim 18 (depends on 10) The terminal of claim 10, wherein the reference pattern is configured in a bitmap format.