# US 2014/0192730 A1 · Method for transmitting and receiving control information of a mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192730 A1 - Document ID: US20140192730A1 - Status: Published application - Kind: A1 - Application number: 14/124,404 - Filed: 2012-06-07 - Published: 2014-07-10 - Earliest claimed: 2011-06-07 - Assignees: Electronics and Telecommunications Research Institute - Inventors: Bang-Won Seo; Young-Jo Ko; Tae-Gyun Noh; Jae-Young Ahn - Web page: https://patentgrep.com/patent/US20140192730A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Disclosed is a method for transmitting and receiving control information. The method for transmitting control information according to the present invention, in a mobile communication system in which a control channel region and a data channel region are separated from each other, comprises the steps of: determining a control channel resource for transmitting control information by means of the data channel region; and transmitting the control information using the determined control channel resource. According to the present invention, a capacity for control information, which increases for multiple user multiple-input multiple-out (MIMOs) in a heterogeneous network environment, for heterogeneous network interference control using carrier aggregation, for frequent use of a multicast-broadcast single frequency network (MBSFN) subframe, and for a CoMP transmission control, may be satisfied. Further, an adaptive resource allocation based on a requested capacity for control information may be enabled, and the efficient utilization of resources may also be enabled. ## Claims ### Claim 1 A method in which a base station transmits downlink control information to a terminal in a mobile communication system where a Physical Downlink Control Channel (PDCCH) area is divided from a Physical Downlink Shared Channel (PDSCH) area, the method comprising: creating the downlink control information; deciding an enhanced Physical Downlink Control Channel (ePDCCH) resource for transmitting the downlink control information through the PDSCH area; and transmitting the downlink control information to the terminal using the ePDCCH resource. ### Claim 2 (depends on 1) The method of claim 1, wherein the ePDCCH is transmitted through one or both of first and second slots of a subframe. ### Claim 3 (depends on 1) The method of claim 1, wherein in the deciding of the ePDCCH resource for transmitting the downlink control information, the ePDCCH resource is specified using at least one of information about a group of all Physical Resource Blocks (PRBs) through which the ePDCCH is transmitted in the PDSCH area, information about a group of UE-specific PRBs through which the ePDCCH is transmitted, among the group of all PRBs, and information about enhanced Control Channel Elements (eCCEs) belonging to the group of UE-specific PRBs. ### Claim 4 (depends on 3) The method of claim 3, wherein in the deciding of the ePDCCH resource for transmitting the downlink control information, at least one of the group of all PRBs and the group of UE-specific PRBs is specified to be a UE-specific ePDCCH search space of the terminal. ### Claim 5 (depends on 3) The method of claim 3, wherein in the deciding of the ePDCCH resource for transmitting the downlink control information, at least one of the group of all PRBs, the group of UE-specific PRBs, and the eCCEs belonging to the group of UE-specific PRBs is decided using at least one of a unique identifier of the terminal and a number of a slot through which the downlink control channel is transmitted. ### Claim 6 (depends on 3) The method of claim 3, wherein in the deciding of the ePDCCH resource for transmitting the downlink control information, at least one of the information about the group of all PRBs, the information about the group of UE-specific PRBs, and the information about the eCCEs belonging to the group of UE-specific PRBs is transmitted to the terminal using at least one of System Information (SI) broadcasting, Radio Resource Control (RRC) signaling, and a PDCCH. ### Claim 7 (depends on 6) The method of claim 6, wherein when the at least one of the information about the group of all PRBs, the information about the group of UE-specific PRBs, and the information about the eCCEs belonging to the group of UE-specific PRBs is transmitted to the terminal using the PDCCH, the PDCCH is transmitted to a UE-specific PDCCH search space of the terminal. ### Claim 8 (depends on 1) The method of claim 1, wherein uplink control information including ACK/NACK information with respect to a PDSCH scheduled based on the downlink control information and transmitted is received using a Physical Uplink Control Channel (PUCCH) resource decided by at least ones of numbers assigned to PRBs through which the downlink control information has been transmitted, numbers assigned to eCCEs in the PRBs through which the downlink control information has been transmitted, and numbers of antenna ports that have transmitted the downlink control information. ### Claim 9 (depends on 8) The method of claim 8, wherein the PUSCH resource is decided using a number of an eCCE having the lowest number among eCCEs through which the downlink control information has been transmitted. ### Claim 10 A method in which a terminal receives downlink control information from a base station in a mobile communication system where a Physical Downlink Control Channel (PDCCH) area is divided from a Physical Downlink Shared Channel (PDSCH) area, the method comprising: deciding an enhanced Physical Downlink Control Channel (ePDCCH) resource for receiving the downlink control information through the PDSCH area; and receiving the downlink control information using the ePDCCH resource. ### Claim 11 (depends on 10) The method of claim 10, wherein the control channel is received through one or both of first and second slots of a subframe. ### Claim 12 (depends on 10) The method of claim 10, wherein in the deciding of the ePDCCH resource for receiving the downlink control information, the ePDCCH resource is specified using at least one of information about a group of all Physical Resource Blocks (PRBs) through which the ePDCCH is received in the PDSCH area, information about a group of UE-specific PRBs through which the ePDCCH is received, among the group of all PRBs, and information about enhanced Control Channel Elements (eCCEs) belonging to the group of UE-specific PRBs. ### Claim 13 (depends on 12) The method of claim 12, wherein in the deciding of the ePDCCH resource for receiving the downlink control information, at least one of the group of all PRBs and the group of UE-specific PRBs is specified to be a UE-specific ePDCCH search space of the terminal. ### Claim 14 (depends on 12) The method of claim 12, wherein in the deciding of the ePDCCH resource for receiving the downlink control information, at least one of the group of all PRBs, the group of UE-specific PRBs, and the eCCEs belonging to the group of UE-specific PRBs is decided using at least one of a unique identifier of the terminal and a number of a slot through which the downlink control channel is received. ### Claim 15 (depends on 12) The method of claim 12, wherein in the deciding of the ePDCCH resource for receiving the downlink control information, at least one of the information about the group of all PRBs, the information about the group of UE-specific PRBs, and the information about the eCCEs belonging to the group of UE-specific PRBs is received from the base station using at least one of System Information (SI) broadcasting, Radio Resource Control (RRC) signaling, and a PDCCH. ### Claim 16 (depends on 15) The method of claim 15, wherein when the at least one of the information about the group of all PRBs, the information about the group of UE-specific PRBs, and the information about the eCCEs belonging to the group of UE-specific PRBs is received from the base station using the PDCCH, the PDCCH is received from a UE-specific PDCCH search space of the terminal. ### Claim 17 (depends on 10) The method of claim 10, wherein uplink control information including ACK/NACK information with respect to a PDSCH scheduled based on the downlink control information and received is transmitted using a Physical Uplink Control Channel (PUCCH) resource decided by at least ones of numbers assigned to PRBs through which the downlink control information has been received, numbers assigned to eCCEs in the PRBs through which the downlink control information has been received, and numbers of antenna ports that have received the downlink control information. ### Claim 18 (depends on 17) The method of claim 17, wherein the PUSCH resource is decided using a number of an eCCE having the lowest number among eCCEs through which the downlink control information has been received.