2-step RACH initiated by PDCCH order

Patent metadata

Field	Value
Publication number	US-12010734-B2
Application number	US-202017420097-A
Country	US
Kind code	B2
Filing date	Feb 17, 2020
Priority date	Feb 15, 2019
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

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.

First claim

What is claimed is:

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.

2. 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.

3. 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.

4. 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.

5. 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.

6. The method of claim 1 , wherein the indication includes a radio network temporary identifier (RNTI) configured via a dedicated radio resource control signaling.

7. 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.

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.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. 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.

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.

16. 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.

17. 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.

18. 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.

19. 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.

20. The BS of claim 15 , wherein the indication includes a radio network temporary identifier (RNTI) configured via a dedicated radio resource control signaling.

Assignees

• Apple Inc

Inventors

• Sosnin Sergey
• Xiong Gang
• Khoryaev Alexey
• Han Seunghee

Classifications

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04W74/0836

  with 2-step access · CPC title

• H04W74/0866

  using a dedicated channel for access · CPC title

• H04W74/006 Primary

  in the downlink, i.e. towards the terminal · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title