# US 11,445,551 B2 · Base station apparatus and user apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,551 B2 - Document ID: US11445551B2 - Status: Granted - Kind: B2 - Application number: 16/644,449 - Filed: 2017-09-08 - Published: 2020-07-16 - Granted: 2022-09-13 - Earliest claimed: 2017-09-08 - Assignees: Ntt Docomo, Inc. - Applicants: Ntt Docomo, Inc. - Inventors: Tomoya Ohara; Hiroki Harada - Web page: https://patentgrep.com/patent/US11445551B2 ## CPC - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0078: {Timing of allocation} - H04L 5/0092: {Indication of how the channel is divided} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/30: Resource management for broadcast services - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04W 48/12: using downlink control channel - 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 base station apparatus that communicates with a user apparatus is provided. The base station apparatus includes: a setting unit configured to arrange in a radio frame one or more blocks and information, the one or more blocks including information used for initial access, the information specifying resources that are associated with the blocks and are used for transmitting preambles; a transmission unit configured to transmit the radio frame to the user apparatus; and a reception unit configured to receive the preambles from the user apparatus via the resources. The information specifying the resource is set based on locations of the blocks arranged in the radio frame. ## Claims ### Claim 1 A terminal comprising: a receiver configured to receive configuration information for identifying a RACH (Random Access Channel) resource from a base station apparatus; a processor configured to identify a slot for transmitting a random access preamble based on the configuration information; and a transmitter configured to transmit the random access preamble to the base station apparatus via a RACH resource arranged in the slot, wherein the processor identifies the RACH resource based on a number of consecutively arranged RACH resources associated with one synchronization signal (SS) block, the number being indicated by the configuration information. ### Claim 2 (depends on 1) The terminal according to claim 1, wherein the processor is configured to identify the RACH resource based on at least one of a format of the random access preamble indicated by the configuration information, a time length of the random access preamble, a position of a slot in which the RACH resource is arranged, and a position of a symbol at which the RACH resource is arranged in the slot. ### Claim 3 (depends on 2) The terminal according to claim 2, wherein the processor is configured to identify the RACH resource based on a symbol that is arranged in a start of the slot and is not used as the RACH resource indicated by the configuration information. ### Claim 4 (depends on 2) The terminal according to claim 2, wherein the configuration information indicates a symbol that is arranged in an end of the slot and is not used as the RACH resource. ### Claim 5 (depends on 2) The terminal according to claim 2, wherein the processor is configured to identify the RACH resource based on consecutive symbols for the RACH resource in the slot which are indicated by the configuration information. ### Claim 6 (depends on 2) The terminal according to claim 2, wherein a time length of the slot is derived from a subcarrier spacing that is same as a determined carrier spacing. ### Claim 7 (depends on 2) The terminal according to claim 2, wherein the processor is configured to identify the RACH resource arranged in the slot by assuming that a subcarrier spacing is 15 kHz in case of a subcarrier spacing of the random access preamble being 1.25 kHz or 5 kHz. ### Claim 8 (depends on 1) The terminal according to claim 1, wherein the processor is configured to identify the RACH resource based on a symbol that is arranged in a start of the slot and is not used as the RACH resource indicated by the configuration information. ### Claim 9 (depends on 8) The terminal according to claim 8, wherein the configuration information indicates a symbol that is arranged in an end of the slot and is not used as the RACH resource. ### Claim 10 (depends on 8) The terminal according to claim 8, wherein the processor is configured to identify the RACH resource based on consecutive symbols for the RACH resource in the slot which are indicated by the configuration information. ### Claim 11 (depends on 8) The terminal according to claim 8, wherein a time length of the slot is derived from a subcarrier spacing that is same as a determined carrier spacing. ### Claim 12 (depends on 1) The terminal according to claim 1, wherein the configuration information indicates a symbol that is arranged in an end of the slot and is not used as the RACH resource. ### Claim 13 (depends on 12) The terminal according to claim 12, wherein the processor is configured to identify the RACH resource based on consecutive symbols for the RACH resource in the slot which are indicated by the configuration information. ### Claim 14 (depends on 12) The terminal according to claim 12, wherein a time length of the slot is derived from a subcarrier spacing that is same as a determined carrier spacing. ### Claim 15 (depends on 1) The terminal according to claim 1, wherein the processor is configured to identify the RACH resource based on consecutive symbols for the RACH resource in the slot which are indicated by the configuration information. ### Claim 16 (depends on 15) The terminal according to claim 15, wherein a time length of the slot is derived from a subcarrier spacing that is same as a determined carrier spacing. ### Claim 17 (depends on 1) The terminal according to claim 1, wherein a time length of the slot is derived from a subcarrier spacing that is same as a determined carrier spacing. ### Claim 18 (depends on 1) The terminal according to claim 1, wherein the processor is configured to identify the RACH resource arranged in the slot by assuming that a subcarrier spacing is 15 kHz in case of a subcarrier spacing of the random access preamble being 1.25 kHz or 5 kHz. ### Claim 19 A communication method of a terminal, the communication method comprising: receiving configuration information for identifying a RACH (Random Access Channel) resource from a base station apparatus; identifying a slot for transmitting a random access preamble based on the configuration information; and transmitting the random access preamble to the base station apparatus via a RACH resource arranged in the slot, wherein the identifying includes identifying the RACH resource based on a number of consecutively arranged RACH resources associated with one synchronization signal (SS) block, the number being indicated by the configuration information. ### Claim 20 A base station apparatus comprising: a processor configured to determine a RACH (Random Access Channel) resource; a transmitter configured to transmit configuration information for identifying the RACH resource to a terminal; and a receiver configured to receive a random access preamble from the terminal via a RACH resource arranged in a slot indicated by the configuration information, wherein the processor identifies the RACH resource based on a number of consecutively arranged RACH resources associated with one synchronization signal (SS) block, the number being indicated by the configuration information.