# US 8,787,275 B2 · Wireless communication base station equipment, wireless communication terminal device and search space setting method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,275 B2 - Document ID: US8787275B2 - Status: Granted - Kind: B2 - Application number: 13/122,950 - Filed: 2009-10-30 - Published: 2011-08-11 - Granted: 2014-07-22 - Earliest claimed: 2008-10-31 - Assignees: Panasonic Intellectual Property Corporation of America - Applicants: Akihiko Nishio; Seigo Nakao; Daichi Imamura; Masayuki Hoshino - Inventors: Akihiko Nishio; Seigo Nakao; Daichi Imamura; Masayuki Hoshino - Web page: https://patentgrep.com/patent/US8787275B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof} - H04L 1/0046: {Code rate detection or code type detection (H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091)} - H04L 1/0072: {Error control for data other than payload data, e.g. control data} - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0042: {Intra-user or intra-terminal allocation} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0092: {Indication of how the channel is divided} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 28/04: Error control - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/20: Control channels or signalling for resource management - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/29: between an access point and the access point controlling device - H04W 74/085: {collision avoidance} - H04L 1/0038: {Blind format detection (for detection of modulation format H04L27/0012)} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - 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 wireless communication base station equipment in which CCE allocation can be flexibly performed without collision of ACK/NACK signals between a plurality of unit bands, even when wideband transmission is performed exclusively on a downlink circuit. In this equipment, an allocation unit (105) sets up mutually different search spaces for each of a plurality of downlink unit bands, with respect to wireless communication terminal devices that communicate using a plurality of downlink unit bands, and allocates resource allocation information of downlink circuit data destined for the wireless communication terminal devices to CCEs in mutually different search spaces for each of the plurality of downlink unit bands, and an ACK/NACK reception unit (119); extracts a response signal in respect of the downlink circuit data from the uplink control channel associated with the CCE to which the resource allocation information of this downlink circuit data was allocated. ## Claims ### Claim 1 A base station apparatus comprising: an assigning section configured to assign a downlink control channel for a terminal, for which one or multiple component carriers (CC(s)) are configured, to a control channel element (CCE) in a first search space comprised of a plurality of CCEs, wherein the downlink control channel includes resource assignment information indicating a resource allocated to the terminal in a component carrier n (CCn) out of the configured CC(s); and a transmitting section configured to transmit the downlink control channel to the terminal on the CCE, wherein the first search space, in which the downlink control channel including the resource assignment information indicating the resource allocated in the CCn is assigned, is comprised of the plurality of CCEs depending on the value of n, and wherein a CCE number that defines an end position of the first search space for the CCn and a CCE number that defines a start position of a second search space for a component carrier n+1(CCn+1) are consecutive, the second search space being different from the first search space. ### Claim 2 (depends on 1) The base station apparatus according to claim 1, wherein a number of CC(s) configured for downlink for the terminal is greater than a number of CC(s) configured for uplink for the terminal. ### Claim 3 (depends on 1) The base station apparatus according to claim 1, wherein at least one of the one or multiple CC(s) configured for downlink for the terminal is also configured for uplink for the terminal. ### Claim 4 (depends on 1) The base station apparatus according to claim 1, wherein multiple search spaces for the multiple CCs neighbor each other. ### Claim 5 (depends on 1) The base station apparatus according to claim 1, wherein a CCE number Sn+1, which defines a start position of the second search space for a component carrier n+1 (CCn+1), is set as (Sn+L) mod NccE, where, for the CCn, a CCE number Sn, defines a start position of the first search space, L is a number of CCEs that form the first search space, and NccE is a total number of CCEs within the CCn. ### Claim 6 (depends on 1) The base station apparatus according to claim 1, wherein a difference between CCE numbers that respectively define start positions of the search spaces for the multiple CCs configured for the terminal, varies among a plurality of terminals. ### Claim 7 (depends on 1) The base station apparatus according to claim 1, wherein multiple search spaces for the multiple CCs are set independently of each other. ### Claim 8 (depends on 1) The base station apparatus according to claim 1, further comprising a receiving section configured to receive an ACK/NACK signal transmitted from the terminal on an uplink control channel m, wherein the value of m is associated with a CCE number of the CCE to which the downlink control channel is assigned. ### Claim 9 (depends on 8) The base station apparatus according to claim 8, wherein said receiving section receives ACK/NACK signals, which are for the multiple CCs configured for the terminal and are transmitted from the terminal in one of the multiple CCs. ### Claim 10 (depends on 1) The base station apparatus according to claim 1, wherein the plurality of CCEs that form the first search space correspond to downlink control channel candidates to be decoded by the terminal. ### Claim 11 (depends on 1) The base station apparatus according to claim 1, wherein the search space is comprised of the plurality of CCEs having consecutive CCE numbers. ### Claim 12 A search space setting method performed by a device, the method comprising: setting, by the device, a first search space, wherein the first search space, in which a downlink control channel including resource assignment information indicating a resource allocated in a component carrier n (CCn) out of one or multiple CCs configured for a terminal apparatus is assigned, is comprised of a plurality of control channel elements (CCEs) that correspond to downlink control channel candidates to be decoded by the terminal apparatus and that depend on the value of n, and a CCE number that defines an end position of the first search space for the CC and a CCE number that defines a start position of a second search space for a component carrier n+1 (CCn+1) are consecutive, the second search space being different from the first search space. ### Claim 13 A communication method comprising: assigning a downlink control channel for a terminal, for which one or multiple component carriers (CC(s)) are configured, to a control channel element (CCE) in a first search space comprised of a plurality of CCEs, wherein the downlink control channel includes resource assignment information indicating a resource allocated to the terminal in a component carrier n (CCn) out of the configured CC(s); and transmitting the downlink control channel to the terminal in the CCE, wherein the first search space, in which the downlink control channel including the resource assignment information indicating the resource allocated in the CC is assigned, is comprised of the plurality of CCEs depending on the value of n, and wherein a CCE number that defines an end position of the first search space for the CCn and a CCE number that defines a start position of a second search space for a component carrier n+1 (CC n+1) are consecutive, the second search space being different from the first search space.