# US 10,873,975 B2 · Random access in next generation wireless systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,975 B2 - Document ID: US10873975B2 - Status: Granted - Kind: B2 - Application number: 16/314,666 - Filed: 2017-09-28 - Published: 2019-10-17 - Granted: 2020-12-22 - Earliest claimed: 2016-09-28 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Martino Freda; Ghyslain Pelletier; Paul Marinier; Tao Deng; J. Patrick Tooher - Web page: https://patentgrep.com/patent/US10873975B2 ## CPC - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 74/004: {in the uplink, i.e. towards network} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0836: with 2-step access - H04W 74/0838: using contention-free random access [CFRA] - 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 wireless transmit/receive unit (WTRU) may initiate a random access. The WTRU may determine whether to select a first random access channel (RACH) procedure or a second RACH procedure for the random access. The first RACH procedure may be a legacy RACH procedure. The second RACH procedure may be an enhanced RACH (eRACH) procedure. The WTRU may determine whether to select the first RACH procedure or the second RACH procedure based at least on a type of uplink data to be transmitted. When the second RACH procedure is selected, the WTRU may determine at least one physical random access channel (PRACH) resource associated with the second RACH procedure. The WTRU may determine a preamble sequence associated with the second RACH procedure. The WTRU may determine a data resource for the uplink data. The WTRU may send a RACH transmission that includes the preamble sequence and the uplink data. ## Claims ### Claim 1 A wireless transmit/receive unit (WTRU) comprising: a processor configured to: initiate a random access; determine whether to select, for the random access, a first random access channel (RACH) procedure or a second RACH procedure based at least on a network configuration, which is provided in system information; when the second RACH procedure is selected, the processor being further configured to: determine at least one physical random access channel (PRACH) resource associated with the second RACH procedure; determine a preamble sequence associated with the second RACH procedure, based at least on higher layer information including information related to preamble sequence; determine preamble resource associated with the second RACH procedure based at least on the higher layer information including information indicating preamble resource; determine a data resource for the uplink data based on one or more of the at least one PRACH resource, the preamble sequence, the type of uplink data, or a size of the uplink data; and send, to a network device using the at least one PRACH resource and the data resource, a RACH transmission that comprises the preamble sequence and the uplink data. ### Claim 2 (depends on 1) The WTRU of claim 1, wherein the processor is further configured to receive a random access response (RAR) message that comprises an acknowledgment (ACK) or a negative acknowledgment (NACK) associated with the uplink data in the RACH transmission. ### Claim 3 (depends on 2) The WTRU of claim 2, wherein the RAR message comprises an uplink grant, the processor further configured to transmit, to the network device based on the uplink grant, one or more of additional pending uplink data, control information, or state transition information. ### Claim 4 (depends on 1) The WTRU of claim 1, wherein the second RACH procedure is an enhanced RACH procedure and the PRACH resource is an enhanced PRACH resource. ### Claim 5 (depends on 1) The WTRU of claim 1, wherein the preamble sequence and the uplink data in the RACH transmission are disjoint in one or more of time or frequency. ### Claim 6 (depends on 1) The WTRU of claim 1, wherein the preamble sequence is prepended to the uplink data in the RACH transmission. ### Claim 7 (depends on 1) The WTRU of claim 1, wherein the processor is further configured to initiate the random access to perform a scheduling request or transmit an amount of data that is below a predetermined threshold. ### Claim 8 (depends on 1) The WTRU of claim 1, wherein the data resource is determined from a set of available resources indicated via one or more of system information, an access table, or a physical data control channel (PDCCH) grant to a specific radio network identifier (RNTI). ### Claim 9 (depends on 1) The WTRU of claim 1, wherein the PRACH resource comprises the preamble sequence, a time-frequency resource, or a numerology. ### Claim 10 A method of data transmission, the method comprising: initiating a random access; determining whether to select, for the random access, a first random access channel (RACH) procedure or a second RACH procedure based at least on a network configuration, which is provided in system information; when the second RACH procedure is selected, the method further comprising: determining at least one physical random access channel (PRACH) resource associated with the second RACH procedure; determining a preamble sequence associated with the second RACH procedure, based at least on higher layer information including information related to preamble sequence; determining preamble resource associated with the second RACH procedure based at least on the higher layer information including information indicating preamble resource; determining a data resource for the uplink data based on one or more of the at least one PRACH resource, the preamble sequence, the type of uplink data, or a size of the uplink data; and sending, to a network device using the at least one PRACH resource and the data resource, a RACH transmission that comprises the preamble sequence and the uplink data. ### Claim 11 (depends on 10) The method of claim 10, further comprising receiving a random access response (RAR) message that comprises an acknowledgment (ACK) or a negative acknowledgment (NACK) associated with the uplink data in the RACH transmission. ### Claim 12 (depends on 11) The method of claim 11, wherein the RAR message comprises an uplink grant, the method further comprising transmitting, to the network device based on the uplink grant, one or more of additional pending uplink data, control information, or state transition information. ### Claim 13 (depends on 10) The method of claim 10, wherein the second RACH procedure is an enhanced RACH procedure and the PRACH resource is an enhanced PRACH resource. ### Claim 14 (depends on 10) The method of claim 10, wherein the preamble sequence and the uplink data in the RACH transmission are disjoint in one or more of time or frequency. ### Claim 15 (depends on 10) The method of claim 10, wherein the preamble sequence is prepended to the uplink data in the RACH transmission. ### Claim 16 (depends on 10) The method of claim 10, further comprising initiating the random access to perform a scheduling request or transmit an amount of data that is below a predetermined threshold. ### Claim 17 (depends on 10) The method of claim 10, wherein the data resource is determined from a set of available resources indicated via one or more of system information, an access table, or a physical data control channel (PDCCH) grant to a specific radio network identifier (RNTI). ### Claim 18 (depends on 10) The method of claim 10, wherein the PRACH resource comprises the preamble sequence, a time-frequency resource, or a numerology.