# US 12,010,734 B2 · 2-step RACH initiated by PDCCH order > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,734 B2 - Document ID: US12010734B2 - Status: Granted - Kind: B2 - Application number: 17/420,097 - Filed: 2020-02-17 - Published: 2022-03-24 - Granted: 2024-06-11 - Earliest claimed: 2019-02-15 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Sergey Sosnin; Gang Xiong; Alexey Khoryaev; Seunghee Han - Web page: https://patentgrep.com/patent/US12010734B2 ## CPC - H04W 74/0841: {with collision treatment} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0836: with 2-step access - H04W 74/0866: {using a dedicated channel for access} - H04W 74/0833: Random access procedures, e.g. with 4-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 An approach is described for a base station (gNB) that includes the following features. The features include transmitting, by the gNB, a PDCCH signal to a user equipment (UE), wherein the PDCCH signal includes an indication of a PDCCH ordered 2-step RACH procedure. The features also include receiving, by the gNB, a first step of the 2-step RACH procedure, wherein the first step includes a PRACH preamble and an associated MsgA physical uplink shared channel (PUSCH) from the UE. ## Claims ### Claim 1 A method of operating a base station (BS) comprising: configuring, by the BS, a different search space configuration for a physical downlink control channel (PDCCH) ordered physical random access channel (PRACH) for an ordered 2-step random access channel (RACH) procedure compared to a PRACH of a 4-step RACH procedure, wherein a frequency domain resource assignment field in a downlink control information (DCI) format 1_0 used to trigger the ordered 2-step RACH procedure is used to indicate a frequency domain resource allocation of a MsgA physical uplink shared channel (PUSCH) transmission associated with the PRACH for the 2-step RACH procedure, and a remaining resource configuration for the MsgA PUSCH transmission including a time domain resource allocation is indicated by one or more reserved bits in the DCI format 1_0; transmitting, by the BS, a PDCCH signal to a user equipment (UE), wherein the PDCCH signal includes an indication of the PDCCH ordered 2-step RACH procedure; and receiving, by the BS, a first step of the 2-step RACH procedure, wherein the first step includes a PRACH preamble and an associated MsgA PUSCH from the UE. ### Claim 2 (depends on 1) The method of claim 1, wherein the indication includes the one or more reserved bits in the DCI format 1_0, wherein the one or more reserved bits are configured to be interpreted by the UE to trigger transmission of the MsgA PUSCH. ### Claim 3 (depends on 1) The method of claim 1, wherein the indication includes a MsgA PUSCH resource index in the DCI format 1_0, and an association rule between the PRACH and the MsgA PUSCH resource for the 2-step RACH procedure, wherein the association rule is previously configured by higher layers in the BS. ### Claim 4 (depends on 1) The method of claim 1, wherein the indication includes one or more reserved states in a PRACH Mask index field in the DCI format 1_0. ### Claim 5 (depends on 1) The method of claim 1, wherein the indication includes a truncated 10-bit field in the DCI format 1_0, wherein the truncated 10-bit field further indicates at least a portion of a MsgA PUSCH resource configuration. ### Claim 6 (depends on 1) The method of claim 1, wherein the indication includes a radio network temporary identifier (RNTI) configured via a dedicated radio resource control signaling. ### Claim 7 (depends on 1) The method of claim 1, further comprising indicating, by the BS, in a frequency domain resource assignment field in the DCI format 1_0, a frequency domain resource allocation for transmission by the UE of the MsgA PUSCH. ### Claim 8 A non-transitory computer readable medium having instructions stored thereon that, when executed by one or more processors of a base station (BS), cause the BS to perform operations comprising: configuring, by the BS, a different search space configuration for a physical downlink control channel (PDCCH) ordered physical random access channel (PRACH) for an ordered 2-step RACH procedure compared to a PRACH of a 4-step RACH procedure, wherein a frequency domain resource assignment field in a downlink control information (DCI) format 1_0 used to trigger the ordered 2-step RACH procedure is used to indicate a frequency domain resource allocation of a MsgA physical uplink shared channel (PUSCH) transmission associated with the PRACH for the 2-step RACH procedure, and a remaining resource configuration for the MsgA PUSCH transmission including a time domain resource allocation is indicated by one or more reserved bits in the DCI format 1_0; transmitting a PDCCH signal to a user equipment (UE), wherein the PDCCH signal includes an indication of the PDCCH ordered 2-step RACH procedure; and receiving a first step of the 2-step RACH procedure, wherein the first step includes a PRACH preamble and an associated MsgA PUSCH from the UE. ### Claim 9 (depends on 8) The non-transitory computer readable medium of claim 8, wherein the indication includes the one or more reserved bits in the DCI format 1_0, wherein the one or more reserved bits are configured to be interpreted by the UE to trigger transmission of the MsgA PUSCH. ### Claim 10 (depends on 8) The non-transitory computer readable medium of claim 8, wherein the indication includes a MsgA PUSCH resource index in the DCI format 1_0, and an association rule between the PRACH and the MsgA PUSCH resource for the 2-step RACH procedure, wherein the association rule is previously configured by higher layers in the BS. ### Claim 11 (depends on 8) The non-transitory computer readable medium of claim 8, wherein the indication includes one or more reserved states in a PRACH Mask index field in the DCI format 1_0. ### Claim 12 (depends on 8) The non-transitory computer readable medium of claim 8, wherein the indication includes a truncated 10-bit field in the DCI format 1_0, wherein the truncated 10-bit field further indicates at least a portion of a MsgA PUSCH resource configuration. ### Claim 13 (depends on 8) The non-transitory computer readable medium of claim 8, wherein the indication includes a radio network temporary identifier (RNTI) configured via a dedicated radio resource control signaling. ### Claim 14 (depends on 8) The non-transitory computer readable medium of claim 8, wherein the operations further comprise indicating, by the BS, in a frequency domain resource assignment field in the DCI format 1_0, a frequency domain resource allocation for transmission by the UE of the MsgA PUSCH. ### Claim 15 A base station (BS) comprising: processor circuitry configured to: configure, by the BS, a different search space configuration for a physical downlink control channel (PDCCH) ordered physical random access channel (PRACH) for an ordered 2-step RACH procedure compared to a PRACH of a 4-step RACH procedure, wherein a frequency domain resource assignment field in a downlink control information (DCI) format 1_0 used to trigger the ordered 2-step RACH procedure is used to indicate a frequency domain resource allocation of a MsgA physical uplink shared channel (PUSCH) transmission associated with the PRACH for the 2-step RACH procedure, and a remaining resource configuration for the MsgA PUSCH transmission including a time domain resource allocation is indicated by one or more reserved bits in the DCI format 1_0: generate a PDCCH signal, wherein the PDCCH signal includes an indication of the PDCCH ordered 2-step RACH procedure; and radio front end circuitry coupled to the processor circuitry, and configured to: transmit the PDCCH signal to a user equipment (UE); and receive a first step of the 2-step RACH procedure, wherein the first step includes a PRACH preamble and an associated MsgA PUSCH from the UE. ### Claim 16 (depends on 15) The BS of claim 15, wherein the indication includes one or more reserved bits in the DCI format 1_0, and wherein the one or more reserved bits are configured to be interpreted by the UE to trigger transmission of the MsgA PUSCH. ### Claim 17 (depends on 15) The BS of claim 15, wherein the indication includes a MsgA PUSCH resource index in the DCI format 1_0, and an association rule between the PRACH and the MsgA PUSCH resource for the 2-step RACH procedure, wherein the association rule is previously configured by higher layers in the BS. ### Claim 18 (depends on 15) The BS of claim 15, wherein the indication includes one or more reserved states in a PRACH Mask index field in the DCI format 1_0. ### Claim 19 (depends on 15) The BS of claim 15, wherein the indication includes a truncated 10-bit field in the DCI format 1_0, wherein the truncated 10-bit field further indicates at least a portion of a MsgA PUSCH resource configuration. ### Claim 20 (depends on 15) The BS of claim 15, wherein the indication includes a radio network temporary identifier (RNTI) configured via a dedicated radio resource control signaling.