# US 11,452,145 B2 · Sequence-based random access channel (RACH) occasion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,145 B2 - Document ID: US11452145B2 - Status: Granted - Kind: B2 - Application number: 16/875,462 - Filed: 2020-05-15 - Published: 2020-11-26 - Granted: 2022-09-20 - Earliest claimed: 2019-05-22 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jing Sun; Tanumay Datta; Kapil Bhattad; Ananta Narayanan Thyagarajan; Xiaoxia Zhang - Web page: https://patentgrep.com/patent/US11452145B2 ## CPC - H04W 74/0841: {with collision treatment} - H04W 56/001: {Synchronization between nodes} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0836: with 2-step access - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract This disclosure provides systems, methods, and apparatuses for random access channel (RACH) occasions that overlap each other in time and frequency. In one aspect, the RACH occasions may use different preamble sequence sets. A base station may signal configuration information indicating the preamble sequence sets for the RACH occasions and information indicating a time-frequency resource allocation of the RACH occasions. A UE may perform a random access procedure in accordance with the configuration information. ## Claims ### Claim 1 A method of wireless communication performed by an apparatus of a user equipment (UE), comprising: receiving configuration information associated with two or more overlapping random access channel (RACH) occasions, wherein the configuration information indicates preamble sequence sets for the two or more overlapping RACH occasions, wherein each of the two or more overlapping RACH occasions is associated with a respective preamble sequence set, and wherein the two or more overlapping RACH occasions overlap in time and frequency; selecting a RACH occasion, of the two or more overlapping RACH occasions; and transmitting a RACH preamble on the selected RACH occasion in accordance with the respective preamble sequence set associated with the selected RACH occasion. ### Claim 2 (depends on 1) The method of claim 1, wherein the RACH preamble occupies a threshold channel bandwidth of a channel in accordance with an occupied channel bandwidth requirement of the UE. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving a synchronization signal block (SSB) that identifies a particular time-frequency resource allocation, wherein transmitting the RACH preamble on the selected RACH occasion is based at least in part on the selected RACH occasion being associated with the particular time-frequency resource allocation. ### Claim 4 (depends on 1) The method of claim 1, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion of the two or more overlapping RACH occasions, and wherein preamble sequence sets for one or more other RACH occasions, of the two or more overlapping RACH occasions, are derived based at least in part on the first preamble sequence set. ### Claim 5 (depends on 1) The method of claim 1, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion of the two or more overlapping RACH occasions, and wherein a second preamble sequence set for a second RACH occasion of the two or more overlapping RACH occasions starts at a last-used root and a next sequence after a last-used sequence of the first preamble sequence set. ### Claim 6 (depends on 1) The method of claim 1, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion, of the two or more overlapping RACH occasions, and wherein a second preamble sequence set for a second RACH occasion of the two or more overlapping RACH occasions starts at a next root after a last-used root of the first preamble sequence set. ### Claim 7 (depends on 1) The method of claim 1, wherein the configuration information identifies respective root sequences for the preamble sequence sets. ### Claim 8 (depends on 1) The method of claim 1, wherein the configuration information indicates a number of RACH occasions associated with a particular time-frequency resource allocation. ### Claim 9 A method of wireless communication performed by an apparatus of a network entity, comprising: transmitting configuration information associated with two or more overlapping random access channel (RACH) occasions, wherein the configuration information indicates preamble sequence sets for the two or more overlapping RACH occasions, wherein each of the two or more overlapping RACH occasions is associated with a respective preamble sequence set, and wherein the two or more overlapping RACH occasions overlap in time and frequency; and receiving a RACH preamble on a selected RACH occasion, of the two or more overlapping RACH occasions, in accordance with the respective preamble sequence set associated with the selected RACH occasion. ### Claim 10 (depends on 9) The method of claim 9, wherein the RACH preamble occupies a threshold channel bandwidth of a channel in accordance with an occupied channel bandwidth requirement. ### Claim 11 (depends on 9) The method of claim 9, further comprising: transmitting a synchronization signal block (SSB) that identifies a particular time-frequency resource allocation, wherein receiving the RACH preamble on the selected RACH occasion is based at least in part on the selected RACH occasion being associated with the particular time-frequency resource allocation. ### Claim 12 (depends on 9) The method of claim 9, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion of the two or more overlapping RACH occasions, and wherein preamble sequence sets for one or more other RACH occasions, of the two or more overlapping RACH occasions, are derived based at least in part on the first preamble sequence set. ### Claim 13 (depends on 9) The method of claim 9, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion of the two or more overlapping RACH occasions, and wherein a second preamble sequence set for a second RACH occasion of the two or more overlapping RACH occasions starts at a last-used root and a next sequence after a last-used sequence of the first preamble sequence set. ### Claim 14 (depends on 9) The method of claim 9, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion, of the two or more overlapping RACH occasions, and wherein a second preamble sequence set for a second RACH occasion of the two or more overlapping RACH occasions starts at a next root after a last-used root of the first preamble sequence set. ### Claim 15 (depends on 9) The method of claim 9, wherein the configuration information identifies respective root sequences for the preamble sequence sets. ### Claim 16 (depends on 9) The method of claim 9, wherein the configuration information indicates a number of RACH occasions associated with a particular time-frequency resource allocation. ### Claim 17 An apparatus of a user equipment (UE) for wireless communication, comprising: a first interface configured to obtain configuration information associated with two or more overlapping random access channel (RACH) occasions, wherein the configuration information indicates preamble sequence sets for the two or more overlapping RACH occasions, wherein each of the two or more overlapping RACH occasions is associated with a respective preamble sequence set, and wherein the two or more overlapping RACH occasions overlap in time and frequency; a processing system configured to select a RACH occasion, of the two or more overlapping RACH occasions; and a second interface configured to output a RACH preamble for transmission on the selected RACH occasion in accordance with the respective preamble sequence set associated with the selected RACH occasion. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the RACH preamble occupies a threshold channel bandwidth of a channel in accordance with an occupied channel bandwidth requirement of the UE. ### Claim 19 (depends on 17) The apparatus of claim 17, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion of the two or more overlapping RACH occasions, and wherein preamble sequence sets for one or more other RACH occasions, of the two or more overlapping RACH occasions, are derived based at least in part on the first preamble sequence set. ### Claim 20 (depends on 17) The apparatus of claim 17, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion of the two or more overlapping RACH occasions, and wherein a second preamble sequence set for a second RACH occasion of the two or more overlapping RACH occasions starts at a last-used root and a next sequence after a last-used sequence of the first preamble sequence set. ### Claim 21 (depends on 17) The apparatus of claim 17, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion, of the two or more overlapping RACH occasions, and wherein a second preamble sequence set for a second RACH occasion of the two or more overlapping RACH occasions starts at a next root after a last-used root of the first preamble sequence set. ### Claim 22 (depends on 17) The apparatus of claim 17, wherein the configuration information identifies respective root sequences for the preamble sequence sets. ### Claim 23 (depends on 17) The apparatus of claim 17, wherein the configuration information indicates a number of RACH occasions associated with a particular time-frequency resource allocation. ### Claim 24 (depends on 17) The apparatus of claim 17, wherein the first interface is further configured to: receive a synchronization signal block (SSB) that identifies a particular time-frequency resource allocation, wherein outputting the RACH preamble on the selected RACH occasion is based at least in part on the selected RACH occasion being associated with the particular time-frequency resource allocation. ### Claim 25 An apparatus of a network entity for wireless communication, comprising: a first interface configured to output configuration information associated with two or more overlapping random access channel (RACH) occasions, wherein the configuration information indicates preamble sequence sets for the two or more overlapping RACH occasions, wherein each of the two or more overlapping RACH occasions is associated with a respective preamble sequence set, and wherein the two or more overlapping RACH occasions overlap in time and frequency; and a second interface configured to obtain a RACH preamble on a selected RACH occasion, of the two or more overlapping RACH occasions, in accordance with the respective preamble sequence set associated with the selected RACH occasion. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the RACH preamble occupies a threshold channel bandwidth of a channel in accordance with an occupied channel bandwidth requirement. ### Claim 27 (depends on 25) The apparatus of claim 25, wherein the first interface is further configured to: transmit a synchronization signal block (SSB) that identifies a particular time-frequency resource allocation, wherein obtaining the RACH preamble on the selected RACH occasion is based at least in part on the selected RACH occasion being associated with the particular time-frequency resource allocation. ### Claim 28 (depends on 25) The apparatus of claim 25, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion of the two or more overlapping RACH occasions, and wherein preamble sequence sets for one or more other RACH occasions, of the two or more overlapping RACH occasions, are derived based at least in part on the first preamble sequence set. ### Claim 29 (depends on 25) The apparatus of claim 25, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion of the two or more overlapping RACH occasions, and wherein a second preamble sequence set for a second RACH occasion of the two or more overlapping RACH occasions starts at a last-used root and a next sequence after a last-used sequence of the first preamble sequence set. ### Claim 30 (depends on 25) The apparatus of claim 25, wherein the configuration information identifies a first preamble sequence set for a first RACH occasion, of the two or more overlapping RACH occasions, and wherein a second preamble sequence set for a second RACH occasion of the two or more overlapping RACH occasions starts at a next root after a last-used root of the first preamble sequence set.