Invention Grant
- Patent Title: Multiple Msg1 for PDCCH ordered RACH
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Application No.: US16175811Application Date: 2018-10-30
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Publication No.: US11019665B2Publication Date: 2021-05-25
- Inventor: Muhammad Nazmul Islam , Tao Luo , Wanshi Chen , Bilal Sadiq , Makesh Pravin John Wilson , Junyi Li
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Holland & Hart LLP
- Main IPC: H04W74/08
- IPC: H04W74/08 ; H04B7/0408 ; H04L1/00 ; H04L27/26 ; H04W74/00

Abstract:
Methods, systems, and devices for multiple random access channel (RACH) message 1 (Msg1) transmission for physical downlink control channel (PDCCH) ordered RACH are described. A user equipment (UE) may perform the multiple Msg1 transmission as part of a CFRA or CBRA procedure for access. The UE may perform the multiple Msg1 transmissions in a cyclic consecutive manner during configured RACH occasions or according to explicit time and frequency indications of a random access response (RAR) window. Based on the multiple Msg1 transmission procedure, the UE may reduce latency for random access procedure on the RACH and improve signaling throughput. In some cases, the UE may support beam correspondence and may perform multiple Msg1 transmissions to enhance multi-beam diversity during RACH transmission by performing transmission corresponding to RACH occasions mapped to different synchronization signal blocks (SSBs).
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