Granted Patent B2

US 12,267,871 · App. 17/593,753 · Granted Apr 1, 2025

Inventors: Seyed Ali Akbar Fakoorian (Cupertino, CA); Chunhai Yao (Beijing, CN); Chunxuan Ye (San Diego, CA); Dawei Zhang (Cupertino, CA); Haitong Sun (Cupertino, CA); Hong He (Cupertino, CA); Oghenekome Oteri (San Diego, CA); Sigen Ye (Cupertino, CA); Wei Zeng (Cupertino, CA); Weidong Yang (San Diego, CA); Yushu Zhang (Beijing, CN)

Assignee: APPLE INC.

H04W74/0833H04W74/006

Abstract

Claims (35)

1. A method for wireless communications by a base station, comprising:

decoding a random access channel (RACH) preamble received from a user equipment (UE) via a physical random access channel (PRACH);

determining a number of repetitions for transmitting a random access response (RAR) over a physical downlink shared channel (PDSCH) in response to the RACH preamble; and

encoding a transmission for the UE to be sent over a physical downlink control channel (PDCCH), the transmission indicating the number of repetitions for transmitting the RAR to the UE using one or more reserved bits of a downlink control information (DCI) that schedules the repetitions for transmitting the RAR;

wherein indicating the number of repetitions using the one or more reserved bits of the DCI that schedules the repetitions for transmitting the RAR comprises:

indicating the number of repetitions in a system information block (SIB), and

mapping the one or more reserved bits of the DCI to the indicated number of repetitions in the SIB.

2. The method of claim 1 , further comprising:

encoding the RAR for transmission over the PDSCH; and

transmitting the PDSCH up to as many times as the number of repetitions.

3. The method of claim 1 , wherein the DCI comprises DCI format 1_0 with a cyclic redundancy check (CRC) scrambled by a random access-radio network temporary identifier (RA-RNTI).

4. An apparatus of a base station, comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, configure the base station to:

decode a random access channel (RACH) preamble received from a user equipment (UE) via a physical random access channel (PRACH);

determine a number of repetitions for transmitting a random access response (RAR) over a physical downlink shared channel (PDSCH) in response to the RACH preamble; and

encode a transmission for the UE to be sent over a physical downlink control channel (PDCCH), the transmission indicating the number of repetitions for transmitting the RAR to the UE using one or more reserved bits of a downlink control information (DCI) that schedules the repetitions for transmitting the RAR;

wherein indicating the number of repetitions using the one or more reserved bits of the DCI that schedules the repetitions for transmitting the RAR comprises:

indicating the number of repetitions in a system information block (SIB), and

mapping the one or more reserved bits of the DCI to the indicated number of repetitions in the SIB.

5. The apparatus of claim 4 , wherein the instructions, when executed by the one or more processors, further configure the base station to:

encode the RAR for transmission over the PDSCH; and

transmit the PDSCH up to as many times as the number of repetitions.

6. The apparatus of claim 4 , wherein the DCI comprises DCI format 1_0 with a cyclic redundancy check (CRC) scrambled by a random access-radio network temporary identifier (RA-RNTI).

7. A non-transitory computer-readable storage medium including instructions that, when executed by one or more processors of a base station, cause the base station to:

decode a random access channel (RACH) preamble received from a user equipment (UE) via a physical random access channel (PRACH);

determine a number of repetitions for transmitting a random access response (RAR) over a physical downlink shared channel (PDSCH) in response to the RACH preamble; and

encode a transmission for the UE to be sent over a physical downlink control channel (PDCCH), the transmission indicating the number of repetitions for transmitting the RAR to the UE using one or more reserved bits of a downlink control information (DCI) that schedules the repetitions for transmitting the RAR;

wherein indicating the number of repetitions using the one or more reserved bits of the DCI that schedules the repetitions for transmitting the RAR comprises:

indicating the number of repetitions in a system information block (SIB), and

mapping the one or more reserved bits of the DCI to the indicated number of repetitions in the SIB.

8. The non-transitory computer-readable storage medium of claim 7 , wherein the instructions, when executed by the one or more processors, further cause the base station to:

encode the RAR for transmission over the PDSCH; and

transmit the PDSCH up to as many times as the number of repetitions.

9. The non-transitory computer-readable storage medium of claim 7 , wherein the DCI comprises DCI format 1_0 with a cyclic redundancy check (CRC) scrambled by a random access-radio network temporary identifier (RA-RNTI).

Assignments (1)

Continuity (1)

References Cited (21)