Invention Publication
- Patent Title: MESSAGE 1 CFO COMPENSATION METHOD BASED ON RAPID MISMATCH
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Application No.: US18548869Application Date: 2021-05-29
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Publication No.: US20240172295A1Publication Date: 2024-05-23
- Inventor: Yuyu YAN , Liang HONG , Jie MAO , Levent AYDIN , Erman KOKEN , yongle WU , Rebecca Wen-Ling YUAN , Ziad AHMAD , Brian Clarke BANISTER , Ashok MANTRAVADI , Nanrun WU , Xinyu WANG , Jie ZHU
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- International Application: PCT/CN2021/097028 2021.05.29
- Date entered country: 2023-09-01
- Main IPC: H04W74/0833
- IPC: H04W74/0833 ; H04B17/318 ; H04W74/08

Abstract:
Aspects are provided which allow a UE to apply CFO compensation to resolve mismatched RAPIDs caused by uplink Doppler shifts in HST deployments. The UE obtains one or more RARs each including a RAPID, where each of the RARs is responsive to a random access message including a preamble. The UE determines, in each of a threshold number of the one or more RARs, that the RAPID of a corresponding RAR is different than the preamble of a corresponding random access message. The UE then offsets a carrier frequency for each of one or more subsequent random access messages in response to the determination. As a result, mismatched RAPIDs due to uplink Doppler shifts may be avoided and RACH success rates may thereby be improved.
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