# US 9,883,498 B2 · Mobile station apparatus, base station apparatus, communication method and integrated circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,498 B2 - Document ID: US9883498B2 - Status: Granted - Kind: B2 - Application number: 14/439,269 - Filed: 2013-10-31 - Published: 2015-10-15 - Granted: 2018-01-30 - Earliest claimed: 2012-11-01 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: Kazuyuki Shimezawa; Toshizo Nogami; Shoichi Suzuki; Kimihiko Imamura - Web page: https://patentgrep.com/patent/US9883498B2 ## 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} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 72/20: Control channels or signalling for resource management - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - 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 In a wireless communication system in which a base station communicates with a terminal, the base station efficiently notifies of control information for the terminal. A base station apparatus maps an EPDCCH to any of candidates of the EPDCCH included in each of a first EPDCCH set and a second EPDCCH set which are configured by RRC signaling, and a mobile station apparatus monitors the candidate of the EPDCCH. The candidate of EPDCCH is determined at least based on the number of resource elements satisfying a predetermined criterion in one of physical resource block pairs that are configured for EPDCCH transmission in the first EPDCCH set. ## Claims ### Claim 1 A terminal apparatus configured to communicate with a base station apparatus, the terminal apparatus comprising: an Enhanced Physical Downlink Control CHannel (EPDCCH) processor configured to and/or programmed to monitor EPDCCH candidates in each of a first EPDCCH set and a second EPDCCH set, the first EPDCCH set and the second EPDCCH set being determined according to a Radio Resource Control (RRC) signaling, wherein the EPDCCH candidates in each of the first EPDCCH set and the second EPDCCH set are determined at least on a basis of a number of resource elements satisfying a predetermined criteria in one physical resource block pair which is configured for possible EPDCCH transmission of the first EPDCCH set. ### Claim 2 (depends on 1) The terminal apparatus according to claim 1, wherein when the number of resource elements satisfying the predetermined criteria in the one physical resource block pair is smaller than a predetermined number, the EPDCCH candidates in each of the first EPDCCH set and the second EPDCCH set are determined at least on a basis of a first EPDCCH candidate number. ### Claim 3 (depends on 2) The terminal apparatus according to claim 2, wherein when the number of resource elements satisfying the predetermined criteria in the one physical resource block pair is equal to or larger than the predetermined number, the EPDCCH candidates in each of the first EPDCCH set and the second EPDCCH set are determined at least on a basis of a second EPDCCH candidate number. ### Claim 4 (depends on 2) The terminal apparatus according to claim 2, wherein the predetermined number is 104. ### Claim 5 (depends on 1) The terminal apparatus according to claim 1, wherein an OFDM symbol index in a first slot in a subframe of each of the resource elements satisfying the predetermined criteria is equal to or larger than a value configured for the first EPDCCH set. ### Claim 6 (depends on 1) The terminal apparatus according to claim 1, wherein each of the resource elements satisfying the predetermined criteria is included in an enhanced resource element group in a physical resource block pair and is assumed by the terminal apparatus not to be used for transmission of a channel state information reference signal or a cell-specific reference signal. ### Claim 7 (depends on 1) The terminal apparatus according to claim 1, wherein the EPDCCH candidates in each of the first EPDCCH set and the second EPDCCH set are further determined on a basis of a cyclic prefix type, a subframe type, and a Downlink Control Information (DCI) format monitored. ### Claim 8 (depends on 3) The terminal apparatus according to claim 3, wherein the first EPDCCH candidate number is included in a first aggregation level group which does not comprise aggregation level 1, the second EPDCCH candidate number is included in a second aggregation level group which comprises aggregation level 1. ### Claim 9 A base station apparatus configured to communicate with a terminal apparatus, the base station apparatus comprising: an Enhanced Physical Downlink Control CHannel (EPDCCH) generator configured to and/or programmed to map an EPDCCH to an EPDCCH candidate in either a first EPDCCH set or a second EPDCCH set, the first EPDCCH set and the second EPDCCH set being determined according to a Radio Resource Control (RRC) signaling, the EPDCCH candidate in either the first EPDCCH set or the second EPDCCH set is determined at least on a basis of a number of resource elements satisfying a predetermined criteria in one physical resource block pair which is configured for possible EPDCCH transmission of the first EPDCCH set. ### Claim 10 (depends on 9) The base station apparatus according to claim 9, wherein when the number of resource elements satisfying the predetermined criteria in the one physical resource block pair is smaller than a predetermined number, the EPDCCH candidate in either the first EPDCCH set or the second EPDCCH set is determined at least on a basis of a first EPDCCH candidate number. ### Claim 11 (depends on 10) The base station apparatus according to claim 10, wherein when the number of resource elements satisfying the predetermined criteria in the one physical resource block pair is equal to or larger than the predetermined number, the EPDCCH candidate in either the first EPDCCH set or the second EPDCCH set is determined at least on a basis of a second EPDCCH candidate number. ### Claim 12 (depends on 10) The base station apparatus according to claim 10, wherein the predetermined number is 104. ### Claim 13 (depends on 9) The base station apparatus according to claim 9, wherein an OFDM symbol index in a first slot in a subframe of each of the resource elements satisfying the predetermined criteria is equal to or larger than a value configured for the first EPDCCH set. ### Claim 14 (depends on 9) The base station apparatus according to claim 9, wherein each of the resource elements satisfying the predetermined criteria is included in an enhanced resource element group in a physical resource block pair and is not used for transmission of a channel state information reference signal or a cell-specific reference signal. ### Claim 15 (depends on 9) The base station apparatus according to claim 9, wherein the EPDCCH candidate in either the first EPDCCH set or the second EPDCCH set is further determined on a basis of a cyclic prefix type, a subframe type, and a Downlink Control Information (DCI) format. ### Claim 16 (depends on 11) The base station apparatus according to claim 11, wherein the first EPDCCH candidate number is included in a first aggregation level group which does not comprise aggregation level 1, the second EPDCCH candidate number is included in a second aggregation level group which comprises aggregation level 1. ### Claim 17 A communication method of a terminal apparatus which is configured to communicate with a base station apparatus, the communication method comprising: monitoring EPDCCH candidates in each of a first EPDCCH set and a second EPDCCH set, the first EPDCCH set and the second EPDCCH set being determined according to a Radio Resource Control (RRC) signaling, wherein the EPDCCH candidates in each of the first EPDCCH set and the second EPDCCH set are determined at least on a basis of a number of resource elements satisfying a predetermined criteria in one physical resource block pair which is configured for possible EPDCCH transmission of the first EPDCCH set. ### Claim 18 A communication method of a base station apparatus which is configured to communicate with a terminal apparatus, the communication method comprising: mapping an EPDCCH to an EPDCCH candidate in either a first EPDCCH set or a second EPDCCH set, the first EPDCCH set and the second EPDCCH set being determined according to a Radio Resource Control (RRC) signaling, the EPDCCH candidate in either the first EPDCCH set or the second EPDCCH set is determined at least on a basis of a number of resource elements satisfying a predetermined criteria in one physical resource block pair which is configured for possible EPDCCH transmission of the first EPDCCH set.