# US 9,883,495 B2 · Extending physical downlink control channels > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,495 B2 - Document ID: US9883495B2 - Status: Granted - Kind: B2 - Application number: 14/044,480 - Filed: 2013-10-02 - Published: 2014-02-06 - Granted: 2018-01-30 - Earliest claimed: 2009-09-28 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Aris Papasakellariou; Joon-Young Cho - Web page: https://patentgrep.com/patent/US9883495B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 8/26: Network addressing or numbering for mobility support - H04W 24/00: Supervisory, monitoring or testing arrangements - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 48/10: using broadcasted information - H04W 48/12: using downlink control channel - H04W 72/04: Wireless resource allocation - H04W 72/1273: of downlink data flows - H04W 76/20: Manipulation of established connections - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0092: {Indication of how the channel is divided} - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 56/00: Synchronisation arrangements - 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 Methods and apparatuses for transmitting and receiving at least one Downlink Control Information (DCI) in a communication system supporting Carrier Aggregation (CA) are provided. The method for receiving includes receiving information representative of presence of carrier indicator by higher layer signaling from a Node B; receiving information representative of at least one cell indicator by higher layer signaling from the Node B; defining an UE specific search space based on aggregation level, an UE ID, and at least one carrier indicator value, where the UE specific search space includes a set of Physical Downlink Control CHannel (PDCCH) candidates based on the aggregation level; decoding at least one PDCCH including at least one DCI respectively by the UE ID; and acquiring the at least one DCI, wherein the at least one carrier indicator value is based on the at least one cell indicator. ## Claims ### Claim 1 A method for receipt of downlink control information (DCI) in a communication system, the method comprising: receiving information representative of presence of carrier indicator on higher layer signaling from a Node B; receiving information representative of at least one cell index on higher layer signaling from the Node B; defining a user equipment (UE) specific search space based on an aggregation level, a UE ID, and at least one carrier indicator value, where the UE specific search space comprises a set of physical downlink control channel (PDCCH) candidates based on the aggregation level; and decoding at least one PDCCH including at least one DCI respectively based on the UE ID; wherein the at least one carrier indicator value is based on the at least one cell index, and wherein the UE specific search space is identified by parameters of the UE specific search space for a single cell. ### Claim 2 (depends on 1) The method of claim 1, wherein the at least one carrier indicator value is same as the at least one cell index. ### Claim 3 (depends on 1) The method of claim 1, wherein the information representative of presence of carrier indicator on higher layer signaling is UE specific. ### Claim 4 (depends on 1) The method of claim 1, wherein the information representative of at least one cell index on higher layer signaling is UE specific. ### Claim 5 (depends on 1) The method of claim 1, wherein if information representative of absence of carrier indicator is received, further comprising: defining the UE specific search space based on the aggregation level and the UE ID; decoding at least one PDCCH including at least one DCI respectively based on the UE ID; and acquiring the at least one DCI. ### Claim 6 (depends on 1) The method of claim 1, further comprising: monitoring a common search space for PDCCH without carrier indicator. ### Claim 7 (depends on 1) The method of claim 1, further comprising steps of: defining a common search space based on the aggregation level; decoding at least one PDCCH including at least one DCI respectively based on the UE ID; and acquiring the at least one DCI, wherein the at least one DCI does not contain a carrier indicator. ### Claim 8 (depends on 1) The method of claim 1, wherein at least one format of all DCI formats does not contain carrier indicator regardless of the information representative of presence of carrier indicator. ### Claim 9 (depends on 8) The method of claim 8, wherein the at least one format of all DCI formats is at least one DCI format included in at least one PDCCH over common search space. ### Claim 10 (depends on 1) The method of claim 1, further comprising: receiving information representative of scheduling multiple cells through a single cell on higher layer signaling. ### Claim 11 An apparatus for receipt of downlink control information (DCI) in a communication system, the apparatus comprising: a receiver configured to receive information representative of presence of carrier indicator on higher layer signaling from a Node B, and to receive information representative of at least one cell index on higher layer signaling from the Node B; and a controller configured to define a UE specific search space based on an aggregation level, a UE ID, and at least one carrier indicator value, where the UE specific search space comprises a set of physical downlink control channel (PDCCH) candidates based on the aggregation level, and to decode at least one PDCCH including at least one DCI respectively based on the UE ID; wherein the at least one carrier indicator value is based on the at least one cell index, and wherein the UE specific search space is identified by parameters of the UE specific search space for a single cell. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the at least one carrier indicator value is same as the at least one cell index. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the information representative of presence of carrier indicator on higher layer signaling is UE specific. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the information representative of at least one cell index on higher layer signaling is UE specific. ### Claim 15 (depends on 11) The apparatus of claim 11, wherein if information representative of absence of carrier indicator is received, further configured to: define the UE specific search space based on the aggregation level and the UE ID; decode at least one PDCCH including at least one DCI respectively based on the UE ID; and acquire the at least one DCI. ### Claim 16 (depends on 11) The apparatus of claim 11, further configured to: monitor a common search space for PDCCH without carrier indicator. ### Claim 17 (depends on 11) The apparatus of claim 11, further configured to: define a common search space based on the aggregation level; decode at least one PDCCH including at least one DCI respectively based on the UE ID; and acquire the at least one DCI, wherein the at least one DCI does not contain a carrier indicator. ### Claim 18 (depends on 11) The apparatus of claim 11, wherein at least one format of all DCI formats does not contain carrier indicator regardless of the information representative of presence of carrier indicator. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the at least one format of all DCI formats is at least one DCI format included in at least one PDCCH over common search space. ### Claim 20 (depends on 11) The apparatus of claim 11, further configured to: receive information representative of scheduling multiple cells through a single cell on higher layer signaling. ### Claim 21 A method for transmission of downlink control information (DCI) in a communication system, the method comprising: transmitting information representative of presence of carrier indicator on higher layer signaling to a user equipment (UE); and transmitting information representative of at least one cell index on higher layer signaling to the UE, wherein a UE specific search space is defined based on an aggregation level, a UE ID, and at least one carrier indicator value, where the UE specific search space comprises a set of physical downlink control channel (PDCCH) candidates based on the aggregation level, wherein at least one PDCCH comprises at least one DCI respectively based on the UE ID, wherein the at least one carrier indicator value is based on the at least one cell index, and wherein the UE specific search space is identified by parameters of the UE specific search space for a single cell. ### Claim 22 (depends on 21) The method of claim 21, wherein the at least one carrier indicator value is same as the at least one cell index. ### Claim 23 (depends on 21) The method of claim 21, wherein the information representative of presence of carrier indicator on higher layer signaling is UE specific. ### Claim 24 (depends on 21) The method of claim 21, wherein the information representative of at least one cell index on higher layer signaling is UE specific. ### Claim 25 (depends on 21) The method of claim 21, wherein if information representative of absence of carrier indicator is transmitted, the UE specific search space is defined based on the aggregation level and the UE ID, and wherein at least one PDCCH comprises at least one DCI respectively based on the UE ID. ### Claim 26 (depends on 21) The method of claim 21, wherein a common search space for PDCCH without carrier indicator is defined. ### Claim 27 (depends on 21) The method of claim 21, wherein a common search space is defined based on the aggregation level, and wherein at least one PDCCH comprises at least one DCI respectively based on the UE ID, and wherein the at least one DCI does not contain a carrier indicator. ### Claim 28 (depends on 21) The method of claim 21, wherein at least one format of all DCI formats does not contain carrier indicator regardless of the information representative of presence of carrier indicator. ### Claim 29 (depends on 28) The method of claim 28, wherein the at least one format of all DCI formats is at least one DCI format included in at least one PDCCH over common search space. ### Claim 30 (depends on 21) The method of claim 21, further comprising: transmitting information representative of scheduling multiple cells through a single cell based on higher layer signaling. ### Claim 31 An apparatus for transmission of downlink control information (DCI) in a communication system, the apparatus comprising: a transmitter configured to transmit information representative of presence of carrier indicator on higher layer signaling to a user equipment (UE), and to transmit information representative of at least one cell index on higher layer signaling to the UE; and a controller configured to control the transmitter to transmit, to the UE, at least one DCI to the UE within a UE specific search space that is defined based on an aggregation level, a UE ID, and at least one carrier indicator value, where the UE specific search space comprises a set of Physical Downlink Control Channel (PDCCH) candidates based on the aggregation level, wherein at least one PDCCH comprises the at least one DCI respectively based on the UE ID, wherein the at least one carrier indicator value is based on the at least one cell index, and wherein the UE specific search space is identified by parameters of the UE specific search space for a single cell. ### Claim 32 (depends on 31) The apparatus of claim 31, wherein the at least one carrier indicator value is same as the at least one cell index. ### Claim 33 (depends on 31) The apparatus of claim 31, wherein the information representative of presence of carrier indicator on higher layer signaling is UE specific. ### Claim 34 (depends on 31) The apparatus of claim 31, wherein the information representative of at least one cell index on higher layer signaling is UE specific. ### Claim 35 (depends on 31) The apparatus of claim 31, wherein if information representative of absence of carrier indicator is transmitted, the UE specific search space is defined based on the aggregation level and the UE ID, and wherein at least one PDCCH comprises at least one DCI respectively based on the UE ID. ### Claim 36 (depends on 31) The apparatus of claim 31, wherein a common search space for PDCCH without carrier indicator is defined. ### Claim 37 (depends on 31) The apparatus of claim 31, wherein a common search space is defined based on the aggregation level, and wherein at least one PDCCH comprises at least one DCI respectively based on the UE ID, and wherein the at least one DCI does not contain a carrier indicator. ### Claim 38 (depends on 31) The apparatus of claim 31, wherein at least one format of all DCI formats does not contain carrier indicator regardless of the information representative of presence of carrier indicator. ### Claim 39 (depends on 38) The apparatus of claim 38, wherein the at least one format of all DCI formats is at least one DCI format included in at least one PDCCH over common search space. ### Claim 40 (depends on 31) The apparatus of claim 31, further configured to: transmit information representative of scheduling multiple cells through a single cell on higher layer signaling.