# US 9,439,139 B2 · Method and apparatus for controlling operation state of base station 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 9,439,139 B2 - Document ID: US9439139B2 - Status: Granted - Kind: B2 - Application number: 14/079,260 - Filed: 2013-11-13 - Published: 2014-05-15 - Granted: 2016-09-06 - Earliest claimed: 2012-11-13 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Yongjun Kwak; Youngbum Kim; Joonyoung Cho; Younsun Kim; Juho Lee; Hyoungju Ji - Web page: https://patentgrep.com/patent/US9439139B2 ## CPC - H04W 52/0206: {in access points, e.g. base stations} - H04W 24/00: Supervisory, monitoring or testing arrangements - H04W 24/02: Arrangements for optimising operational condition - H04W 48/16: Discovering, processing access restriction or access information - 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 Methods and apparatus are provided for controlling transition of an operation state of a cell in a wireless communication system. The cell includes a transceiver configured to transmit and receive signals to and from a terminal and another cell. The cell also includes a controller configured to transition an operation state of the cell from an active state to a dormant state, transmit a discovery signal, determine whether a cell activation signal is received from a node that controls the cell, and transition the operation state of the cell from the dormant state to the active state when the cell activation signal is received. ## Claims ### Claim 1 A method for activating a cell, by the cell, in a wireless communication system, the method comprising the steps of transitioning an operation state of the cell from an active state to a dormant state; transmitting a discovery signal including cell state information indicating that the operation state of the cell is the active state or the dormant state; determining whether a cell activation signal is received from a node that controls the cell; and transitioning the operation state of the cell from the dormant state to the active state, if the cell activation signal is received. ### Claim 2 (depends on 1) The method of claim 1, wherein the discovery signal further includes a cell identifier (ID). ### Claim 3 A method for activating a cell by a terminal in a wireless communication system, the method comprising the steps of: receiving, from a serving cell, control information for use in receiving a discovery signal of the cell; receiving, from the cell, the discovery signal including cell state information based on the control information, the cell state information indicating an operation state of the cell is an active state or a dormant state; generating neighbor cell measurement information based on the discovery signal; and transmitting the neighbor cell measurement information to the serving cell, wherein the operation state of the cell is transitioned from the dormant state to the active state, if a cell activation signal, which is generated by the serving cell based on the neighbor cell measurement information, is transmitted to the cell. ### Claim 4 (depends on 3) The method of claim 3, wherein the discovery signal further includes a cell identifier (ID), and the neighbor cell measurement information includes at least one of received signal strength of the discovery signal, the cell ID, and the cell state information. ### Claim 5 A method for activating a cell by a serving cell in a wireless communication system, the method comprising the steps of: receiving, from a terminal served by the serving cell, neighbor cell measurement information generated based on a discovery signal, the discovery signal being transmitted from the cell to the terminal and including cell state information that indicates that an operation state of the cell is an active state or a dormant state; checking the operation state of the cell based on the neighbor cell measurement information; determining whether to activate the cell, when the cell is in the dormant state; and transmitting an activation message from the serving cell to the cell, if it is determined to activate the cell. ### Claim 6 (depends on 5) The method of claim 5, wherein determining whether to activate the cell comprises determining to activate the cell, if there is a terminal performing handover to the cell. ### Claim 7 A cell for activating the cell in a wireless communication system, the cell comprising: a transceiver configured to transmit and receive signals to and from a terminal and another cell; and a controller configured to transition an operation state of the cell from an active state to a dormant state, transmit a discovery signal including cell state information that indicates that the operation state of the cell is the active state or the dormant state, determine whether a cell activation signal is received from a node that controls the cell, and transition the operation state of the cell from the dormant state to the active state, if the cell activation signal is received. ### Claim 8 (depends on 7) The cell of claim 7, wherein the discovery signal further includes a cell identifier (ID). ### Claim 9 A terminal for activating a cell in a wireless communication system, the terminal comprising: a transceiver configured to transmit and receive signals; and a controller configured to control reception of control information for use in receiving a discovery signal of the cell from a serving cell, reception of the discovery signal, based on the control information including cell state information that indicates that an operation state of the cell is an active state or a dormant state, generation of neighbor cell measurement information based on the discovery signal, and transmission of the neighbor cell measurement information to the serving cell, wherein the operation state of the cell is transitioned from the dormant state to the active state, if a cell activation signal, which is generated by the serving cell based on the neighbor cell measurement information, is transmitted to the cell. ### Claim 10 (depends on 9) The terminal of claim 9, wherein the discovery signal further includes a cell identifier (ID), and the neighbor cell measurement information includes at least one of received signal strength of the discovery signal, the cell ID, and the cell state information. ### Claim 11 A cell for activating a neighbor cell in a wireless communication system, the cell comprising: a transceiver configured to transmit and receive signals to and from a terminal or another cell; and a controller configured to control reception, from the terminal served by the cell, of neighbor cell measurement information generated based on a discovery signal, the discovery signal being transmitted from the neighbor cell to the terminal and including cell state information that indicates that an operation state of the neighbor cell is an active state or a dormant state, checking of the operation state of the neighbor cell based on the neighbor cell measurement information, determination of whether to activate the neighbor cell if the neighbor cell is in the dormant state, and transmission of an activation message to the neighbor cell if it is determined to activate the neighbor cell. ### Claim 12 (depends on 11) The cell of claim 11, wherein the controller determines to activate the neighbor cell, if there is a terminal performing handover to the neighbor cell.