# US 2025/0097983 A1 · Random access procedures > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0097983 A1 - Document ID: US20250097983A1 - Status: Published application - Kind: A1 - Application number: 18/470,982 - Filed: 2023-09-20 - Published: 2025-03-20 - Earliest claimed: 2023-09-20 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jing LEI; Kazuki TAKEDA; Kianoush HOSSEINI - Web page: https://patentgrep.com/patent/US20250097983A1 ## CPC - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - 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) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a physical downlink control channel (PDCCH) message indicating initiation of a random access procedure, the PDCCH message having a dedicated format with a set of fields for indicating one or more parameters associated with the initiation of the random access procedure. The UE may transmit a first random access message of the random access procedure, the first random access message being associated with the one or more parameters. Numerous other aspects are described. ## Claims ### Claim 1 A user equipment (UE) for wireless communication, comprising: one or more memories; and one or more processors, coupled to the one or more memories, individually or collectively configured to cause the UE to: receive a physical downlink control channel (PDCCH) message indicating initiation of a random access procedure, the PDCCH message having a dedicated format with a set of fields for indicating one or more parameters associated with the initiation of the random access procedure; and transmit a first random access message of the random access procedure, the first random access message being associated with the one or more parameters. ### Claim 2 (depends on 1) The UE of claim 1, wherein the random access procedure is a 4-step random access procedure or a 2-step random access procedure, wherein the random access procedure is initiated on a primary cell or a secondary cell, wherein the PDCCH triggers the random access procedure of one or more UEs, and wherein the random access procedure is a contention-based random access procedure or a contention-free random access procedure. ### Claim 3 (depends on 1) The UE of claim 1, wherein a supplementary link is configured on a carrier frequency different from a primary cell associated with carrier aggregation or multiple connectivity, and wherein one or more random access resources associated with uplink or downlink communication of the random access procedure are configured on the supplementary link. ### Claim 4 (depends on 1) The UE of claim 1, wherein the one or more processors, individually or collectively, are further configured to cause the UE to: transmit, on an uplink control channel or a data channel, a hybrid automatic repeat request (HARQ) feedback as a response to receiving a random access response message or contention resolution message associated with the random access procedure, wherein the uplink control channel or data channel is configured on: a cell for which the UE initiates the random access procedure, or a cell that is configured with a valid uplink control resource associated with a HARQ procedure and that is different from the cell for which the UE initiates the random access procedure. ### Claim 5 (depends on 1) The UE of claim 1, wherein a secondary cell associated with carrier aggregation or multiple connectivity is configured with a first set of resources associated with receiving a random access response message or a contention resolution message of the random access procedure, and wherein the secondary cell is configured with a second set of resources for transmitting an uplink control channel or data channel communication in connection with the random access procedure. ### Claim 6 (depends on 1) The UE of claim 1, wherein a plurality of communications on a secondary cell, in connection with the random access procedure, share a common set of beam parameters configured for the secondary cell. ### Claim 7 (depends on 1) The UE of claim 1, wherein the one or more parameters include a parameter relating to at least one of: a UE-specific or common search space set configuration, a UE-specific or group-common radio network temporary identifier configuration, a downlink control information payload configuration, a priority indicator for the random access procedure, a random access procedure type indicator, a carrier indicator, a link type indicator, a downlink or uplink reference signal indicator, a power control parameter, a resource indicator for a sequence, a time or frequency occasion of a preamble, or a resource allocation indicator for a data channel in a time or frequency domain. ### Claim 8 (depends on 1) The UE of claim 1, wherein the PDCCH message is received on a supplementary link or a non-supplementary link of a primary cell associated with carrier aggregation or multiple connectivity. ### Claim 9 (depends on 1) The UE of claim 1, wherein the PDCCH message is received from a source cell or transmit and receive point (TRP) associated with a mobility procedure. ### Claim 10 (depends on 1) The UE of claim 1, wherein the PDCCH message is received from a scheduling secondary cell or a scheduling primary cell associated with carrier aggregation or multiple connectivity. ### Claim 11 A network node for wireless communication, comprising: one or more memories; and one or more processors, coupled to the one or more memories, individually or collectively configured to cause the network node to: transmit a physical downlink control channel (PDCCH) message indicating initiation of a random access procedure, the PDCCH message having a dedicated format with a set of fields for indicating one or more parameters associated with the initiation of the random access procedure; and receive a first random access message of the random access procedure, the first random access message being associated with the one or more parameters. ### Claim 12 (depends on 11) The network node of claim 11, wherein the random access procedure is a 4-step random access procedure or a 2-step random access procedure, wherein the random access procedure is initiated on a primary cell or a secondary cell, wherein the PDCCH triggers the random access procedure of one or more user equipment, and wherein the random access procedure is a contention-based random access procedure or a contention-free random access procedure. ### Claim 13 (depends on 11) The network node of claim 11, wherein a supplementary link is configured on a carrier frequency different from a primary cell associated with carrier aggregation or multiple connectivity, and wherein one or more random access resources associated with uplink or downlink communication of the random access procedure are configured on the supplementary link. ### Claim 14 (depends on 11) The network node of claim 11, wherein the one or more processors, individually or collectively, are further configured to cause the network node to: receive, on an uplink control channel or a data channel, a hybrid automatic repeat request (HARQ) feedback as a response to transmitting a random access response message or contention resolution message associated with the random access procedure, wherein the uplink control channel or data channel is configured on: a cell for which a user equipment initiates the random access procedure, or a cell that is configured with a valid uplink control resource associated with a HARQ procedure and that is different from the cell for which the user equipment initiates the random access procedure. ### Claim 15 (depends on 11) The network node of claim 11, wherein a secondary cell associated with carrier aggregation or multiple connectivity is configured with a first set of resources associated with transmitting a random access response message or a contention resolution message of the random access procedure, and wherein the secondary cell is configured with a second set of resources for transmitting an uplink control channel or data channel communication in connection with the random access procedure. ### Claim 16 (depends on 11) The network node of claim 11, wherein a plurality of communications on a secondary cell, in connection with the random access procedure, share a common set of beam parameters configured for the secondary cell. ### Claim 17 (depends on 11) The network node of claim 11, wherein the one or more parameters include a parameter relating to at least one of: a user equipment-specific or common search space set configuration, a user equipment-specific or group-common radio network temporary identifier configuration, a downlink control information payload configuration, a priority indicator for the random access procedure, a random access procedure type indicator, a carrier indicator, a link type indicator, a downlink or uplink reference signal indicator, a power control parameter, a resource indicator for a sequence, a time or frequency occasion of a preamble, or a resource allocation indicator for a data channel in a time or frequency domain. ### Claim 18 (depends on 11) The network node of claim 11, wherein the PDCCH message is transmitted on a supplementary link or a non-supplementary link of a primary cell associated with carrier aggregation or multiple connectivity. ### Claim 19 (depends on 11) The network node of claim 11, wherein the PDCCH message is transmitted on a source cell or transmit and receive point (TRP) associated with a mobility procedure. ### Claim 20 (depends on 11) The network node of claim 11, wherein the PDCCH message is transmitted on a scheduling secondary cell or a scheduling primary cell associated with carrier aggregation or multiple connectivity. ### Claim 21 A method of wireless communication performed by a user equipment (UE), comprising: receiving a physical downlink control channel (PDCCH) message indicating initiation of a random access procedure, the PDCCH message having a dedicated format with a set of fields for indicating one or more parameters associated with the initiation of the random access procedure; and transmitting a first random access message of the random access procedure, the first random access message being associated with the one or more parameters. ### Claim 22 (depends on 21) The method of claim 21, wherein the random access procedure is a 4-step random access procedure or a 2-step random access procedure, wherein the random access procedure is initiated on a primary cell or a secondary cell, wherein the PDCCH triggers the random access procedure of one or more UEs, and wherein the random access procedure is a contention-based random access procedure or a contention-free random access procedure. ### Claim 23 (depends on 21) The method of claim 21, wherein a supplementary link is configured on a carrier frequency different from a primary cell associated with carrier aggregation or multiple connectivity, and wherein one or more random access resources associated with uplink or downlink communication of the random access procedure are configured on the supplementary link. ### Claim 24 (depends on 21) The method of claim 21, further comprising: transmitting, on an uplink control channel or a data channel, a hybrid automatic repeat request (HARQ) feedback as a response to receiving a random access response message or contention resolution message associated with the random access procedure, wherein the uplink control channel or data channel is configured on: a cell for which the UE initiates the random access procedure, or a cell that is configured with a valid uplink control resource associated with a HARQ procedure and that is different from the cell for which the UE initiates the random access procedure. ### Claim 25 (depends on 21) The method of claim 21, wherein a secondary cell associated with carrier aggregation or multiple connectivity is configured with a first set of resources associated with receiving a random access response message or a contention resolution message of the random access procedure, and wherein the secondary cell is configured with a second set of resources for transmitting an uplink control channel or data channel communication in connection with the random access procedure. ### Claim 26 (depends on 21) The method of claim 21, wherein a plurality of communications on a secondary cell, in connection with the random access procedure, share a common set of beam parameters configured for the secondary cell. ### Claim 27 (depends on 21) The method of claim 21, wherein the one or more parameters include a parameter relating to at least one of: a UE-specific or common search space set configuration, a UE-specific or group-common radio network temporary identifier configuration, a downlink control information payload configuration, a priority indicator for the random access procedure, a random access procedure type indicator, a carrier indicator, a link type indicator, a downlink or uplink reference signal indicator, a power control parameter, a resource indicator for a sequence, a time or frequency occasion of a preamble, or a resource allocation indicator for a data channel in a time or frequency domain. ### Claim 28 (depends on 21) The method of claim 21, wherein the PDCCH message is received on a supplementary link or a non-supplementary link of a primary cell associated with carrier aggregation or multiple connectivity. ### Claim 29 A method of wireless communication performed by a network node, comprising: transmitting a physical downlink control channel (PDCCH) message indicating initiation of a random access procedure, the PDCCH message having a dedicated format with a set of fields for indicating one or more parameters associated with the initiation of the random access procedure; and receiving a first random access message of the random access procedure, the first random access message being associated with the one or more parameters. ### Claim 30 (depends on 29) The method of claim 29, wherein the random access procedure is a 4-step random access procedure or a 2-step random access procedure, wherein the random access procedure is initiated on a primary cell or a secondary cell, wherein the PDCCH triggers the random access procedure of one or more user equipment, and wherein the random access procedure is a contention-based random access procedure or a contention-free random access procedure.