# US 9,438,400 B2 · Transmission device, receiving device, transmission method, and receiving method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,438,400 B2 - Document ID: US9438400B2 - Status: Granted - Kind: B2 - Application number: 14/125,553 - Filed: 2013-04-25 - Published: 2014-05-08 - Granted: 2016-09-06 - Earliest claimed: 2012-05-09 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Ayako Horiuchi; Akihiko Nishio - Web page: https://patentgrep.com/patent/US9438400B2 ## CPC - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04W 72/1273: of downlink data flows - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Disclosed is a transmission apparatus capable of properly performing cross carrier scheduling in ePDCCHs. In this apparatus, when communication is performed using a plurality of component carriers (CCs), configuration section 102 configures a first search space as a candidate to which control information for a first CC is assigned and a second search space as a candidate to which control information for a second CC other than the first CC among the plurality of CCs is assigned, within a same allocation unit group among a plurality of allocation unit groups included in a data-assignable region within the first CC, and transmission section 106 transmits control information mapped to the first search space and control information mapped to the second search space. ## Claims ### Claim 1 A communication apparatus comprising: a configurer that configures a first search space and a second search space within one physical resource block set (PRB set) among a plurality of PRB sets included in a data region of a first component carrier, wherein the second search space is configured using a Carrier Indicator Field value (CIF value) that is set for a second component carrier, the first search space includes one or more mapping candidates for mapping a first downlink control information for the first component carrier, and the second search space includes one or more mapping candidates for mapping a second downlink control information for the second component carrier; and a transmitter that transmits the first downlink control information using the first search space and to transmit the second downlink control information using the second search space. ### Claim 2 (depends on 1) The communication apparatus according to claim 1, wherein each of the plurality of PRB sets includes a plurality of control channel elements (CCEs); and in the configurer, one or more CCEs corresponding to the one or more mapping candidates included in the second search space are given by cyclically shifting one or more CCEs corresponding to the one or more mapping candidates included in the first search space by the CIF value that is set for the second component carrier. ### Claim 3 (depends on 1) The communication apparatus according to claim 1, wherein the mapping candidate is an Enhanced Physical Downlink Control Channel (EPDCCH) candidate in the data region and consists of CCEs of a same number as an aggregation level, wherein the aggregation level indicates a number of CCEs that are aggregated to form one EPDCCH candidate. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, wherein each of the plurality of PRB sets includes a plurality of control channel elements (CCEs), each CCE including a plurality of resource element groups (REGs); and a correspondence relationship between CCE numbers and REG numbers in the second search space is same as a correspondence relationship between CCE numbers and REG numbers in the first search space. ### Claim 5 (depends on 1) The communication apparatus according to claim 1, wherein the configurer configures the second search space on a resource which does not overlap with the first search space within the one PRB set. ### Claim 6 (depends on 1) The communication apparatus according to claim 1, wherein the first component carrier is a primary cell and the second component carrier is a secondary cell. ### Claim 7 A communication method comprising: configuring a first search space and a second search space within one physical resource block set (PRB set) among a plurality of PRB sets included in a data region of a first component carrier, wherein the second search space is configured using a Carrier Indicator Field value (CIF value) that is set for a second component carrier, the first search space includes one or more mapping candidates for mapping a first downlink control information for the first component carrier, and the second search space includes one or more mapping candidates for mapping a second downlink control information for the second component carrier; and transmitting the first downlink control information using the first search space and transmitting the second downlink control information using the second search space. ### Claim 8 (depends on 7) The communication method according to claim 7, wherein each of the plurality of PRB sets includes a plurality of control channel elements (CCEs); and one or more CCEs corresponding to the one or more mapping candidates included in the second search space are given by cyclically shifting one or more CCEs corresponding to the one or more mapping candidates included in the first search space by the CIF value that is set for the second component carrier. ### Claim 9 (depends on 7) The communication method according to claim 7, wherein the mapping candidate is an Enhanced Physical Downlink Control Channel (EPDCCH) candidate in the data region and consists of CCEs of a same number as an aggregation level, wherein the aggregation level indicates a number of CCEs that are aggregated to form one EPDCCH candidate. ### Claim 10 (depends on 7) The communication method according to claim 7, wherein each of the plurality of PRB sets includes a plurality of control channel elements (CCEs), each CCE including a plurality of resource element groups (REGs); and a correspondence relationship between CCE numbers and REG numbers in the second search space is same as a correspondence relationship between CCE numbers and REG numbers in the first search space. ### Claim 11 (depends on 7) The communication method according to claim 7, wherein the second search space is configured on a resource which does not overlap with the first search space within the one PRB set. ### Claim 12 (depends on 7) The communication method according to claim 7, wherein the first component carrier is a primary cell and the second component carrier is a secondary cell.