# US 2021/0242955 A1 · Terminal apparatus, base station apparatus and communication method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242955 A1 - Document ID: US20210242955A1 - Status: Published application - Kind: A1 - Application number: 17/270,431 - Filed: 2019-08-22 - Published: 2021-08-05 - Earliest claimed: 2018-08-23 - Assignees: Sharp Kabushiki Kaisha; FG Innovation Company Limited - Applicants: Sharp Kabushiki Kaisha; FG Innovation Company Limited - Inventors: SHOICHI SUZUKI; TOMOKI YOSHIMURA; TOSHIZO NOGAMI; WATARU OUCHI; TAEWOO LEE; HUI-FA LIN - Web page: https://patentgrep.com/patent/US20210242955A1 ## CPC - H04J 11/0079: {Acquisition of downlink reference signals, e.g. detection of cell-ID} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/2601: {Multicarrier modulation systems} - H04L 27/2613: {Structure of the reference signals} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0037: {Inter-user or inter-terminal allocation} - H04L 5/0042: {Intra-user or intra-terminal allocation} - H04L 27/2607: {Cyclic extensions} - H04W 72/20: Control channels or signalling for resource management - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - 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 The present invention can perform communication efficiently. In a case that (1) the terminal apparatus is configured to monitor a first PDCCH candidate in a CSS and a second PDCCH candidate in a USS according to a DCI format with a C-RNTI, (2) a set of resource elements constituting the first PDCCH candidate is the same as a set of resource elements constituting the second PDCCH candidate, (3) a higher layer parameter is not set, and/or (4) the size of the DCI format corresponding to the first PDCCH candidate is the same as the size of the DCI format corresponding to the second PDCCH candidate, a terminal apparatus regards that a PDCCH with the DCI format is transmitted or received in the first PDCCH candidate when the PDCCH with the DCI format is received in the second PDCCH candidate. ## Claims ### Claim 1 A terminal apparatus comprising: a processor; and a memory coupled to the processor, the processor being configured to: receive at least one physical downlink control channel (PDCCH) with a downlink control information (DCI) format; and receive a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) that is configured in a “frequency domain resource assignment” field of the DCI format and that is given at least based on a type of search space in which the PDCCH is detected; wherein in a case where the terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a user equipment specific search space (USS) according to the DCI format with a cell radio network temporary identifier (C-RNTI), a set of control channel elements (CCEs) constituting the first PDCCH candidate is the same as a set of CCEs constituting the second PDCCH, the first PDCCH candidate and the second PDCCH candidate correspond to the same scrambling, and the size of the DCI format corresponding to the first PDCCH candidate is the same as the size of the DCI format corresponding to the second PDCCH candidate, the processor is further configured to monitor the DCI format associated with the first PDCCH candidate. ### Claim 2 (depends on 1) The terminal apparatus according to claim 1, wherein a control resource set (CORESET) corresponding to the first PDCCH candidate is the same as a CORESET corresponding to the second PDCCH candidate. ### Claim 3 (depends on 1) The terminal apparatus according to claim 1, wherein a set of fields of the DCI format corresponding to the first PDCCH candidate is the same as a set of fields of the DCI format corresponding to the second PDCCH candidate. ### Claim 4 (depends on 1) The terminal apparatus according to claim 1, wherein the DCI format is a DCI format 0_0 or a DCI format 1_0. ### Claim 5 (depends on 1) The terminal apparatus according to claim 1, wherein: a scrambling sequence cPDCCH (i) for scrambling the PDCCH is initialized by using cPDCCH_init; the cPDCCH_init is given at least based on nRNTI; in a case where the higher layer parameter PDCCH-demodulation reference signal (DMRS)-Scrambling-ID is configured, the nRNTI is given by the C-RNTI for the PDCCH in the USS; in a case where the higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured, the nRNTI is 0; and the C-RNTI is a value different from 0. ### Claim 6 A base station apparatus comprising: a processor; and a memory coupled to the processor, the processor being configured to: transmit at least one physical downlink control channel (PDCCH) with a downlink control information (DCI) format; and transmit a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) that is configured in a “frequency domain resource assignment” field of the DCI format and that is given at least based on a type of search space in which the PDCCH is detected; wherein in a case where a terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a user equipment specific search space (USS) according to the DCI format with a cell radio network temporary identifier (C-RNTI), a set of control channel elements (CCEs) constituting the first PDCCH candidate is the same as a set of CCEs constituting the second PDCCH, the first PDCCH candidate and the second PDCCH candidate correspond to the same scrambling, and the size of the DCI format corresponding to the first PDCCH candidate is the same as the size of the DCI format corresponding to the second PDCCH candidate, the processor is further configured to transmit the DCI format associated with the first PDCCH candidate. ### Claim 7 (depends on 6) The base station apparatus according to claim 6, wherein a control resource set (CORESET) corresponding to the first PDCCH candidate is the same as a CORESET corresponding to the second PDCCH candidate. ### Claim 8 (depends on 6) The base station apparatus according to claim 6, wherein a set of fields of the DCI format corresponding to the first PDCCH candidate is the same as a set of fields of the DCI format corresponding to the second PDCCH candidate. ### Claim 9 (depends on 6) The base station apparatus according to claim 6, wherein the DCI format is a DCI format 0_0 or a DCI format 1_0. ### Claim 10 (depends on 6) The base station apparatus according to claim 6, wherein: a scrambling sequence cPDCCH for scrambling the PDCCH is initialized by using cPDCCH_init; the cPDCCH_init is given at least based on nRNTI; in a case where the higher layer parameter PDCCH-demodulation reference signal (DMRS)-Scrambling-ID is configured, the nRNTI is given by the C-RNTI for the PDCCH in the USS; in a case where the higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured, the nRNTI is 0; and the C-RNTI is a value different from 0. ### Claim 11 A communication method for a terminal apparatus, the communication method comprising: receiving a physical downlink control channel (PDCCH) with a downlink control information (DCI) format; and receiving a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) that is configured in a “frequency domain resource assignment” field of the DCI format and that is given at least based on a type of search space in which the PDCCH is detected; wherein in a case where the terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a user equipment specific search space (USS) according to the DCI format with a cell radio network temporary identifier (C-RNTI), a set of control channel elements (CCEs) constituting the first PDCCH candidate is the same as a set of CCEs constituting the second PDCCH, the first PDCCH candidate and the second PDCCH candidate correspond to the same scrambling, and the size of the DCI format corresponding to the first PDCCH candidate is the same as the size of the DCI format corresponding to the second PDCCH candidate, monitoring the DCI format associated with the first PDCCH candidate. ### Claim 12 (canceled) ### Claim 13 (depends on 11) The method of claim 11, wherein a control resource set (CORESET) corresponding to the first PDCCH candidate is the same as a CORESET corresponding to the second PDCCH candidate. ### Claim 14 (depends on 11) The method of claim 11, wherein a set of fields of the DCI format corresponding to the first PDCCH candidate is the same as a set of fields of the DCI format corresponding to the second PDCCH candidate. ### Claim 15 (depends on 11) The method of claim 11, wherein the DCI format is a DCI format 0_0 or a DCI format 1_0. ### Claim 16 (depends on 11) The method of claim 11, wherein: a scrambling sequence cPDCCH (i) for scrambling the PDCCH is initialized by using cPDCCH_init; the cPDCCH_init is given at least based on nRNTI; in a case where the higher layer parameter PDCCH-demodulation reference signal (DMRS)-Scrambling-ID is configured, the nRNTI is given by the C-RNTI for the PDCCH in the USS; in a case where the higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured, the nRNTI is 0; and the C-RNTI is a value different from 0.