2-step RACH initiated by PDCCH order
AssigneeApple Inc.
InventorsSergey Sosnin, Gang Xiong, Alexey Khoryaev, Seunghee Han
Life of this patent
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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.
Claims20
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.
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.
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.
Dependencies are inferred from the claim text.