# US 12,225,589 B2 · Transmission device, reception device, transmission method, and reception method using random access preamble > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,589 B2 - Document ID: US12225589B2 - Status: Granted - Kind: B2 - Application number: 17/261,835 - Filed: 2019-10-02 - Published: 2021-09-30 - Granted: 2025-02-11 - Earliest claimed: 2018-11-01 - Assignees: Panasonic Intellectual Property Corporation of America - Applicants: Panasonic Intellectual Property Corporation of America - Inventors: Takashi Iwai; Tomofumi Takata; Hidetoshi Suzuki; Tetsuya Yamamoto - Web page: https://patentgrep.com/patent/US12225589B2 ## CPC - H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) - H04W 74/0836: with 2-step access - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 72/04: Wireless resource allocation - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)} - H04W 74/0833: Random access procedures, e.g. with 4-step access - 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 The present invention provides a terminal that can carry out a random-access process appropriately. A terminal (100) is provided with: a wireless transmission unit (108) that transmits a data signal; and a control unit (101) that determines a second resource for use in transmitting the data signal on the basis of a first resource for use in transmitting a preamble signal. ## Claims ### Claim 1 A communication apparatus, comprising: circuitry, which, in operation: in response to a path loss between the communication apparatus and a base station being less than a threshold, selects a random access preamble randomly from a first plurality of random access preambles; and, in response to the path loss not being less than the threshold, selects a random access preamble randomly from a second plurality of random access preambles, wherein, data transmission resource information is configured, which includes a subcarrier number and a number of consecutive interlaces for the first plurality of random access preambles and the second plurality of random access preambles, the subcarrier number specifying one index out of five indices indicating five interlace positions evenly dispersed in physical resource block (PRB) clusters in a frequency domain, and the number of consecutive interlaces indicating a number of consecutive PRBs in each of the PRB clusters; and a transmitter, which, in operation, transmits the selected random access preamble and a data signal based on the data transmission resource information corresponding to the selected random access preamble. ### Claim 2 (depends on 1) The communication apparatus according to claim 1, wherein the first plurality of random access preambles and the second plurality of random access preambles are generated according to different sequences, respectively. ### Claim 3 (depends on 1) The communication apparatus according to claim 1, wherein the data transmission resource information includes a symbol number that indicates a symbol to which the data signal is mapped. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, wherein the transmitter transmits the selected random access preamble in a 2-step random access procedure. ### Claim 5 A communication method for a communication apparatus, the communication method comprising: in response to a path loss between the communication apparatus and a base station being less than a threshold, selecting a random access preamble randomly from a first plurality of random access preambles; in response to the path loss not being less than the threshold, selecting a random access preamble randomly from a second plurality of random access preambles, wherein, data transmission resource information is configured, which includes a subcarrier number and a number of consecutive interlaces for the first plurality of random access preambles and the second plurality of random access preambles, the subcarrier number specifying one index out of five indices indicating five interlace positions evenly dispersed in physical resource block (PRB) clusters in a frequency domain, and the number of consecutive interlaces indicating a number of consecutive PRBs in each of the PRB clusters; and transmitting the selected random access preamble and a data signal based on the data transmission resource information corresponding to the selected random access preamble. ### Claim 6 (depends on 5) The communication method according to claim 5, wherein the first plurality of random access preambles and the second plurality of random access preambles are generated according to different sequences, respectively. ### Claim 7 (depends on 5) The communication method according to claim 5, wherein the data transmission resource information includes a symbol number that indicates a symbol to which the data signal is mapped. ### Claim 8 (depends on 5) The communication method according to claim 5, the selected random access preamble is transmitted in a 2-step random access procedure.