# US 2021/0243820 A1 · Method of determining frequency-domain offset parameter, user equipment (ue), random access method, method for configuring random access information, corresponding device and computer readable medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243820 A1 - Document ID: US20210243820A1 - Status: Published application - Kind: A1 - Application number: 17/233,879 - Filed: 2021-04-19 - Published: 2021-08-05 - Earliest claimed: 2018-01-11 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Chen QIAN; Qi XIONG; Bin YU - Web page: https://patentgrep.com/patent/US20210243820A1 ## CPC - H04W 74/0858: {collision detection} - H04L 27/0014: {Carrier regulation (of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657)} - H04L 27/2659: {Coarse or integer frequency offset determination and synchronisation} - H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 2027/0065: {Frequency error detectors (H04L2027/0067 takes precedence)} - H04L 2027/0095: {in a preamble or similar structure} - H04W 74/0838: using contention-free random access [CFRA] - 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 disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). A method of determining a frequency-domain offset parameter of a preamble in a random access channel and a corresponding user equipment (UE) is provided. The method includes obtaining a random access channel subcarrier spacing ΔfRA, a preamble length LRA and a uplink (UL) channel subcarrier spacing Δf from a base station and determining a frequency-domain offset parameter k of a preamble in a random access channel based on the obtained random access channel subcarrier spacing ΔfRA, preamble length LRA and UL channel subcarrier spacing Δf . Other embodiments of the disclosure further provide a random access method, a method for configuring random access information and related device, and a corresponding computer readable medium. ## Claims ### Claim 1 A method performed by a terminal in a communication system, the method comprising: receiving, from a base station, first information related to a length of a random access preamble and second information related to a first subcarrier spacing of a random access channel; receiving, from the base station, third information related to a second subcarrier spacing of a physical uplink shared channel (PUSCH); identifying an offset parameter among a plurality of offset parameters, the offset parameter corresponding to the first information, the second information, and the third information; generating a baseband signal for a physical random access channel (PRACH) based on the offset parameter; and transmitting the random access preamble based on the baseband signal. ### Claim 2 (depends on 1) The method of claim 1, wherein the first information, the second information, and the third information are used to identify a number of resource blocks of the random access channel. ### Claim 3 (depends on 1) The method of claim 1, wherein the offset parameter is “7”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 15, wherein the offset parameter is “1”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 30, wherein the offset parameter is “133”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 60, wherein the offset parameter is “12”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 15, wherein the offset parameter is “10”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 30, and wherein the offset parameter is “7”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 60. ### Claim 4 (depends on 2) The method of claim 2, wherein the number of resource blocks is “6”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 15, wherein the number of resource blocks is “3”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 30, wherein the number of resource blocks is “2”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 60, wherein the number of resource blocks is “24”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 15, wherein the number of resource blocks is “12”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 30, and wherein the number of resource blocks is “6”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 60. ### Claim 5 A method performed by a base station in a communication system, the method comprising: transmitting, to a terminal, first information related to a length of a random access preamble and second information related to a first subcarrier spacing of a random access channel; transmitting, to the terminal, third information related to a second subcarrier spacing of a physical uplink shared channel (PUSCH); and receiving, from the terminal, the random access preamble based on a baseband signal for a physical random access channel (PRACH), the baseband signal being generated based on an offset parameter corresponding to the first information, the second information, and the third information. ### Claim 6 (depends on 5) The method of claim 5, wherein the first information, the second information, and the third information are used to identify a number of resource blocks of the random access channel. ### Claim 7 (depends on 5) The method of claim 5, wherein the offset parameter is “7”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 15, wherein the offset parameter is “1”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 30, wherein the offset parameter is “133”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 60, wherein the offset parameter is “12”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 15, wherein the offset parameter is “10”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 30, and wherein the offset parameter is “7”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 60. ### Claim 8 (depends on 6) The method of claim 6, wherein the number of resource blocks is “6”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 15, wherein the number of resource blocks is “3”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 30, wherein the number of resource blocks is “2”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 60, wherein the number of resource blocks is “24”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 15, wherein the number of resource blocks is “12”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 30, and wherein the number of resource blocks is “6”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 60. ### Claim 9 A terminal in a communication system, the terminal comprising: a transceiver; and at least one processor coupled with the transceiver and configured to: receive, from a base station, first information related to a length of a random access preamble and second information related to a first subcarrier spacing of a random access channel; receive, from the base station, third information related to a second subcarrier spacing of a physical uplink shared channel (PUSCH); identify an offset parameter among a plurality of offset parameters, the offset parameter corresponding to the first information, the second information, and the third information; generate a baseband signal for a physical random access channel (PRACH) based on the offset parameter; and transmit the random access preamble based on the baseband signal. ### Claim 10 (depends on 9) The terminal of claim 9, wherein the first information, the second information, and the third information are used to identify a number of resource blocks of the random access channel. ### Claim 11 (depends on 9) The terminal of claim 9, wherein the offset parameter is “7”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 15, wherein the offset parameter is “1”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 30, wherein the offset parameter is “133”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 60, wherein the offset parameter is “12”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 15, wherein the offset parameter is “10”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 30, and wherein the offset parameter is “7”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 60. ### Claim 12 (depends on 10) The terminal of claim 10, wherein the number of resource blocks is “6”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 15, wherein the number of resource blocks is “3”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 30, wherein the number of resource blocks is “2”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 60, wherein the number of resource blocks is “24”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 15, wherein the number of resource blocks is “12”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 30, and wherein the number of resource blocks is “6”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 60. ### Claim 13 A base station in a communication system, the base station comprising: a transceiver; and at least one processor coupled with the transceiver and configured to: transmit, to a terminal, first information related to a length of a random access preamble and second information related to a first subcarrier spacing of a random access channel; transmit, to the terminal, third information related to a second subcarrier spacing of a physical uplink shared channel (PUSCH); and receive, from the terminal, the random access preamble based on a baseband signal for a physical random access channel (PRACH), the baseband signal being generated based on an offset parameter corresponding to the first information, the second information, and the third information. ### Claim 14 (depends on 13) The base station of claim 13, wherein the first information, the second information, and the third information are used to identify a number of resource blocks of the random access channel. ### Claim 15 (depends on 13) The base station of claim 13, wherein the offset parameter is “7”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 15, wherein the offset parameter is “1”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 30, wherein the offset parameter is “133”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 60, wherein the offset parameter is “12”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 15, wherein the offset parameter is “10”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 30, and wherein the offset parameter is “7”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 60. ### Claim 16 (depends on 14) The base station of claim 14, wherein the number of resource blocks is “6”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 15, wherein the number of resource blocks is “3”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 30, wherein the number of resource blocks is “2”, based on the length of the random access preamble being 839, the first subcarrier spacing being 1.25, and the second subcarrier spacing being 60, wherein the number of resource blocks is “24”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 15, wherein the number of resource blocks is “12”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 30, and wherein the number of resource blocks is “6”, based on the length of the random access preamble being 839, the first subcarrier spacing being 5, and the second subcarrier spacing being 60.