# US 2021/0243680 A1 · Terminal, base station, radio communication method and system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243680 A1 - Document ID: US20210243680A1 - Status: Published application - Kind: A1 - Application number: 17/054,074 - Filed: 2018-05-10 - Published: 2021-08-05 - Earliest claimed: 2018-05-10 - Assignees: Ntt Docomo, Inc. - Applicants: Ntt Docomo, Inc. - Inventors: Hiroki Harada; Daiki Takeda; Tomoya Ohara; Hideaki Takahashi; Kazuki Takeda - Web page: https://patentgrep.com/patent/US20210243680A1 ## CPC - 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 48/12: using downlink control channel - H04L 1/0045: {Arrangements at the receiver end} - H04L 1/0072: {Error control for data other than payload data, e.g. control data} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0082: {at predetermined intervals} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 27/261: {Details of reference signals} - H04W 48/16: Discovering, processing access restriction or access information - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04L 5/0023: {Time-frequency-space} - H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)} - 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 A terminal is disclosed including a receiver that receives configuration information regarding a physical downlink control channel (PDCCH) to configure a common search space; and a processor that monitors downlink control information in the common search space based on the configuration information, wherein the configuration information includes information regarding a search space that is able to be specified by bits in an index of a master information block (MIB) and information regarding a search space index associated with a given search space. In other aspects, a radio communication method, a base station, and a system are also disclosed. ## Claims ### Claim at position 1 -6. (canceled) ### Claim 7 A terminal comprising: a receiver that receives configuration information regarding a physical downlink control channel (PDCCH) to configure a common search space; and a processor that monitors downlink control information in the common search space based on the configuration information, wherein the configuration information includes information regarding a search space that is able to be specified by bits in an index of a master information block (MIB) and information regarding a search space index associated with a given search space. ### Claim 8 (depends on 7) The terminal according to claim 7, wherein monitoring periodicity provided by the configuration information includes a periodicity that is configurable based on the index in the MIB. ### Claim 9 (depends on 7) The terminal according to claim 7, wherein monitoring of the downlink control information in the common search space is associated with a synchronization signal block. ### Claim 10 (depends on 8) The terminal according to claim 8, wherein monitoring of the downlink control information in the common search space is associated with a synchronization signal block. ### Claim 11 (depends on 7) The terminal according to claim 7, wherein the common search space comprises at least one of an SIB1 search space (Type0-PDCCH CSS), an Other System Information (OSI) search space (Type0A-PDCCH CSS), a random access (RA) search space (Type1-PDCCH CSS) and a paging search space (Type2-PDCCH CSS). ### Claim 12 (depends on 8) The terminal according to claim 8, wherein the common search space comprises at least one of an SIB1 search space (Type0-PDCCH CSS), an Other System Information (OSI) search space (Type0A-PDCCH CSS), a random access (RA) search space (Type1-PDCCH CSS), and a paging search space (Type2-PDCCH CSS). ### Claim 13 (depends on 9) The terminal according to claim 9, wherein the common search space comprises at least one of an SIB1 search space (Type0-PDCCH CSS), an Other System Information (OSI) search space (Type0A-PDCCH CSS), a random access (RA) search space (Type1-PDCCH CSS), and a paging search space (Type2-PDCCH CSS). ### Claim 14 (depends on 7) The terminal according to claim 7, wherein: the receiver receives information indicative of a synchronization signal block index, the synchronization signal block index being transmitted in a set including one or more synchronization signal blocks, monitoring of the downlink control information in the common search space is associated with a synchronization signal block based on the information indicative of the synchronization signal block index, and the common search space comprises at least one of an Other System Information (OSI) search space and a paging search space. ### Claim 15 (depends on 8) The terminal according to claim 8, wherein: the receiver receives information indicative of a synchronization signal block index, the synchronization signal block index being transmitted in a set including one or more synchronization signal blocks, monitoring of the downlink control information in the common search space is associated with a synchronization signal block based on the information indicative of the synchronization signal block index, and the common search space comprises at least one of an Other System Information (OSI) search space and a paging search space. ### Claim 16 (depends on 9) The terminal according to claim 9, wherein: the receiver receives information indicative of a synchronization signal block index, the synchronization signal block index being transmitted in a set including one or more synchronization signal blocks, monitoring of the downlink control information in the common search space is associated with a synchronization signal block based on the information indicative of the synchronization signal block index, and the common search space comprises at least one of an Other System Information (OSI) search space and a paging search space. ### Claim 17 (depends on 11) The terminal according to claim 11 wherein: the receiver receives information indicative of a synchronization signal block index, the synchronization signal block index being transmitted in a set including one or more synchronization signal blocks, monitoring of the downlink control information in the common search space is associated with a synchronization signal block based on the information indicative of the synchronization signal block index, and the common search space comprises at least one of the Other System Information (OSI) search space and the paging search space. ### Claim 18 (depends on 14) The terminal according to claim 14, wherein: the downlink control information for a random access response is associated with one synchronization signal block index, when the common search space is a random access search space for the random access response, the processor monitors the common search space based on monitoring periodicity provided by the configuration information, and when the common search space comprises at least one of the OSI search space and the paging search space, the processor monitors the common search space based on the monitoring periodicity provided by the configuration information and the information indicative of the synchronization signal block index. ### Claim 19 A radio communication method for a terminal, comprising: receiving configuration information regarding a physical downlink control channel (PDCCH) to configure a common search space; and monitoring downlink control information in the common search space based on the configuration information, wherein the configuration information includes information regarding a search space that is able to be specified by bits in an index of a master information block (MIB) and information regarding a search space index associated with a given search space. ### Claim 20 A base station comprising: a transmitter configured to transmit configuration information regarding a physical downlink control channel (PDCCH) to configure a common search space; and a processor that controls transmission of downlink control information in the common search space based on the configuration information, wherein the configuration information includes information regarding a search space that is able to be specified by bits in an index of a master information block (MIB) and information regarding a search space index associated with a given search space. ### Claim 21 A system comprising a base station and a terminal, wherein: the base station comprises: a transmitter configured to transmit configuration information regarding a physical downlink control channel (PDCCH) to configure a common search space; and a processor that controls transmission of downlink control information in the common search space based on the configuration information; and the terminal comprises: a receiver that receives the configuration information regarding the PDCCH to configure the common search space; and a processor that monitors the downlink control information in the common search space based on the configuration information, and wherein the configuration information includes information regarding a search space that is able to be specified by bits in an index of a master information block (MIB) and information regarding a search space index associated with a given search space.