# US 12,004,222 B2 · Method and device for transmitting random access signal, 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 12,004,222 B2 - Document ID: US12004222B2 - Status: Granted - Kind: B2 - Application number: 17/423,001 - Filed: 2020-09-24 - Published: 2022-03-31 - Granted: 2024-06-04 - Earliest claimed: 2019-09-27 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Qi Xiong; Feifei Sun; Yi Wang; Bin Yu - Web page: https://patentgrep.com/patent/US12004222B2 ## CPC - H04W 74/0833: Random access procedures, e.g. with 4-step access - 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: 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 A method for 2-step RA (2-step random access) performed by a terminal (UE) is provided. The method comprises receiving, from a base station, first random access channel (RACH) configuration for 4-step RA (4-step random access), second RACH configuration for the 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA; in case that an index indicating a subset of the RA occasions is included in the second RACH configuration, identifying at least one RA occasion for the 2-step RA based on the subset; identifying at least one PUSCH resource based on the PUSCH configuration and the at least one RA occasion; and transmitting, to the base station, a random access preamble in the at least one RA occasion and a PUSCH in the at least one PUSCH resource. ## Claims ### Claim 1 A method for 2-step random access (RA) performed by a terminal in a communication system, the method comprising: receiving, from a base station, a first random access channel (RACH) configuration for 4-step RA, a second RACH configuration for the 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA; in case that a type of a random access is the 2-step RA, identifying an RA occasion for the 2-step RA, wherein, in case that an index indicating a subset of the RA occasions for the 4-step RA shared with the 2-step RA is configured, the RA occasion for the 2-step RA is associated with the subset of the RA occasions for the 4-step RA, and wherein, in case that the index indicating the subset of the RA occasions for the 4-step RA shared with the 2-step RA is not configured, the RA occasion for the 2-step RA is associated with all of the RA occasions for the 4-step RA; and transmitting, to the base station, a random access preamble in the RA occasion for the 2-step RA. ### Claim 2 (depends on 1) The method of claim 1, wherein, in case that information on the RA occasion for the 2-step RA is not included in the second RACH configuration for the 2-step RA, the RA occasions for the 4-step RA are shared with the 2-step RA. ### Claim 3 (depends on 1) The method of claim 1, wherein the transmitting comprises: identifying a PUSCH resource based on the PUSCH configuration, the PUSCH resource being not overlapped with the RA occasion for the 2-step RA; in case that the random access preamble in the RA occasion for the 2-step RA is mapped to the PUSCH resource, transmitting, to the base station, the random access preamble in the RA occasion for the 2-step RA and the PUSCH in a PUSCH resource; and in case that the random access preamble in the RA occasion for the 2-step RA is not mapped to the PUSCH resource, transmitting, to the base station, the random access preamble in the RA occasion for the 2-step RA and skipping transmitting the PUSCH. ### Claim 4 (depends on 1) The method of claim 1, wherein the type of the random access is the 2-step RA in case that a reference signal received power (RSRP) measured by the terminal is higher than a threshold configured by the base station, and wherein the information on the RA occasions for the 4-step RA includes at least one of a physical RACH (PRACH) configuration index and information on frequency resources for the 4-step RA. ### Claim 5 (depends on 1) The method of claim 1, wherein a value 0 of the index indicates all of the RA occasions for the 4-step RA, wherein a value 1 of the index indicates an RA occasion index 1 for the 4-step RA, wherein a value 2 of the index indicates an RA occasion index 2 for the 4-step RA. wherein a value 3 of the index indicates an RA occasion index 3 for the 4-step RA, wherein a value 4 of the index indicates an RA occasion index 4 for the 4-step RA, wherein a value 5 of the index indicates an RA occasion index 5 for the 4-step RA, wherein a value 6 of the index indicates an RA occasion index 6 for the 4-step RA, wherein a value 7 of the index indicates an RA occasion index 7 for the 4-step RA, and wherein a value 8 of the index indicates an RA occasion index 8 for the 4-step RA. ### Claim 6 A method for 2-step random access (RA) performed by a base station in a communication system, the method comprising: transmitting, to a terminal, a first random access channel (RACH) configuration for 4-step RA, a second RACH configuration for the 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA; and in case that a type of a random access is the 2-step RA, receiving, from the terminal, a random access preamble in an RA occasion for the 2-step RA, wherein, in case that an index indicating a subset of the RA occasions for the 4-step RA shared with the 2-step RA is configured, the RA occasion for the 2-step RA is associated with the subset of the RA occasions for the 4-step RA, and wherein, in case that the index indicating the subset of the RA occasions for the 4-step RA shared with the 2-step RA is not configured, the RA occasion for the 2-step RA is associated with all of the RA occasions for the 4-step RA. ### Claim 7 (depends on 5) The method of claim 5, wherein, in case that information on the RA occasion for the 2-step RA is not included in the second RACH configuration for the 2-step RA, the RA occasions for the 4-step RA are shared with the 2-step RA. ### Claim 8 (depends on 5) The method of claim 5, wherein the receiving comprises: in case that the random access preamble in the RA occasion for the 2-step RA is mapped to a PUSCH resource not overlapped with the RA occasion for the 2-step RA, receiving, from the terminal, the random access preamble in the RA occasion for the 2-step RA and a PUSCH in the PUSCH resource; and in case that the random access preamble in the RA occasion for the 2-step RA is not mapped to the PUSCH resource, receiving, from the terminal, the random access preamble in the RA occasion for the 2-step RA and skipping receiving the PUSCH. ### Claim 9 (depends on 5) The method of claim 5, wherein the type of the random access the 2-step RA in case that a reference signal received power (RSRP) measured by the terminal is higher than a threshold configured by the base station, and wherein the information on the RA occasions for the 4-step RA includes at least one of a physical RACH (PRACH) configuration index and information on frequency resources for the 4-step RA. ### Claim 10 (depends on 6) The method of claim 6, wherein a value 0 of the index indicates all of the RA occasions for the 4-step RA, wherein a value 1 of the index indicates an RA occasion index 1 for the 4-step RA, wherein a value 2 of the index indicates an RA occasion index 2 for the 4-step RA, wherein a value 3 of the index indicates an RA occasion index 3 for the 4-step RA, wherein a value 4 of the index indicates an RA occasion index 4 for the 4-step RA, wherein a value 5 of the index indicates an RA occasion index 5 for the 4-step RA, wherein a value 6 of the index indicates an RA occasion index 6 for the 4-step RA, wherein a value 7 of the index indicates an RA occasion index 7 for the 4-step RA, and wherein a value 8 of the index indicates an RA occasion index 8 for the 4-step RA. ### Claim 11 A terminal in a communication system, the terminal comprising: a transceiver; and a processor coupled with the transceiver and configured to: receive, from a base station, a first random access channel (RACH) configuration for 4-step random access (RA), a second RACH configuration for 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA, in case that a type of a random access is the 2-step RA, identify an RA occasion for the 2-step RA, wherein, in case that an index indicating a subset of the RA occasions for the 4-step RA shared with the 2-step RA is configured, the RA occasion for the 2-step RA is associated with the subset of the RA occasions for the 4-step RA, and wherein, in case that the index indicating the subset of the RA occasions for the 4-step RA shared with the 2-step RA is not configured, the RA occasion for the 2-step RA is associated with all of the RA occasions for the 4-step RA, and transmit, to the base station, a random access preamble in the RA occasion for the 2-step RA. ### Claim 12 (depends on 9) The terminal of claim 9, wherein, in case that information on the RA occasion for the 2-step RA is not included in the second RACH configuration for the 2-step RA, the RA occasions for the 4-step RA are shared with the 2-step RA. ### Claim 13 (depends on 9) The terminal of claim 9, wherein the processor is configured to: identify a PUSCH resource based on the PUSCH configuration, the PUSCH resource being not overlapped with the RA occasion for the 2-step RA, in case that the random access preamble in the RA occasion for the 2-step RA is mapped to the PUSCH resource, transmit, to the base station, the random access preamble in the RA occasion for the 2-step RA and a PUSCH in the PUSCH resource, and in case that the random access preamble in the RA occasion for the 2-step RA is not mapped to the PUSCH resource, transmit, to the base station, the random access preamble in the RA occasion for the 2-step RA and skip transmitting the PUSCH. ### Claim 14 (depends on 9) The terminal of claim 9, wherein the type of the random access is the 2-step RA in case that a reference signal received power (RSRP) measured by the terminal is higher than a threshold configured by the base station, and wherein the information on the RA occasions for the 4-step RA includes at least one of a physical RACH (PRACH) configuration index and information on frequency resources for the 4-step RA. ### Claim 15 (depends on 11) The terminal of claim 11, wherein a value 0 of the index indicates all of the RA occasions for the 4-step RA, wherein a value 1 of the index indicates an RA occasion index 1 for the 4-step RA, wherein a value 2 of the index indicates an RA occasion index 2 for the 4-step RA, wherein a value 3 of the index indicates an RA occasion index 3 for the 4-step RA, wherein a value 4 of the index indicates an RA occasion index 4 for the 4-step RA, wherein a value 5 of the index indicates an RA occasion index 5 for the 4-step RA, wherein a value 6 of the index indicates an RA occasion index 6 for the 4-step RA, wherein a value 7 of the index indicates an RA occasion index 7 for the 4-step RA, and wherein a value 8 of the index indicates an RA occasion index 8 for the 4-step RA. ### Claim 16 A base station in a communication system, the base station comprising: a transceiver; and a processor coupled with the transceiver and configured to: transmit, to a terminal, a first random access channel (RACH) configuration for 4-step random access (RA), a second RACH configuration for 2-step RA, and physical uplink shared channel (PUSCH) configuration, the first RACH configuration including information on RA occasions for the 4-step RA, and in case that a type of a random access is the 2-step RA, receive, from the terminal, a random access preamble in an RA occasion for the 2-step RA, wherein, in case that an index indicating a subset of the RA occasions for the 4-step RA shared with the 2-step RA is configured, the RA occasion for the 2-step RA is associated with the subset of the RA occasions for the 4-step RA, and wherein, in case that the index indicating the subset of the RA occasions for the 4-step RA shared with the 2-step RA is not configured, the RA occasion for the 2-step RA is associated with all of the RA occasions for the 4-step RA. ### Claim 17 (depends on 13) The base station of claim 13, wherein, in case that information on the RA occasion for the 2-step RA is not included in the second RACH configuration for the 2-step RA, the RA occasions for the 4-step RA are shared with the 2-step RA. ### Claim 18 (depends on 13) The base station of claim 13, wherein the type of the random access is the 2-step RA in case that a reference signal received power (RSRP) measured by the terminal is higher than a threshold configured by the base station, and wherein the information on the RA occasions for the 4-step RA includes at least one of a physical RACH (PRACH) configuration index and information on frequency resources for the 4-step RA. ### Claim 19 (depends on 13) The base station of claim 13, wherein the processor is configured to: in case that the random access preamble in the RA occasion for the 2-step RA is mapped to a PUSCH resource not overlapped with the RA occasion for the 2-step RA, receive, from the terminal, the random access preamble in the RA occasion for the 2-step RA and a PUSCH in the PUSCH resource, and in case that the random access preamble in the RA occasion for the 2-step RA is not mapped to the PUSCH resource, receive, from the terminal, the random access preamble in the RA occasion for the 2-step RA and skip receiving the PUSCH. ### Claim 20 (depends on 16) The base station of claim 16, wherein a value 0 of the index indicates all of the RA occasions for the 4-step RA, wherein a value 1 of the index indicates an RA occasion index 1 for the 4-step RA, wherein a value 2 of the index indicates an RA occasion index 2 for the 4-step RA, wherein a value 3 of the index indicates an RA occasion index 3 for the 4-step RA, wherein a value 4 of the index indicates an RA occasion index 4 for the 4-step RA, wherein a value 5 of the index indicates an RA occasion index 5 for the 4-step RA, wherein a value 6 of the index indicates an RA occasion index 6 for the 4-step RA, wherein a value 7 of the index indicates an RA occasion index 7 for the 4-step RA, and wherein a value 8 of the index indicates an RA occasion index 8 for the 4-step RA.