- 专利标题: SYSTEMS AND METHODS FOR LATENCY REDUCTION FOR 2-STEP RANDOM ACCESS CHANNEL (RACH) HYBRID AUTOMATIC REPEAT REQUESTS (HARQ)
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申请号: US17754465申请日: 2019-10-02
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公开(公告)号: US20220377801A1公开(公告)日: 2022-11-24
- 发明人: Jing LEI , Muhammad Nazmul ISLAM , Linhai HE , Amir AMINZADEH GOHARI , Yuanning YU , Enoch Shiao-Kuang LU , Yi HUANG , Ruiming ZHENG , Wanshi CHEN
- 申请人: QUALCOMM Incorporated
- 申请人地址: US CA San Diego
- 专利权人: QUALCOMM Incorporated
- 当前专利权人: QUALCOMM Incorporated
- 当前专利权人地址: US CA San Diego
- 国际申请: PCT/CN2019/109800 WO 20191002
- 主分类号: H04W74/08
- IPC分类号: H04W74/08 ; H04W74/00
摘要:
Wireless communications systems and methods related to the timing arrangements and the transmission gap configurations in 2-step random access channel (RACH) procedures to improve system latency and reliability of a RACH HARQ process are provided. The UE transmits a first message including a random access preamble and a payload, and then monitors for a second message in response to the first message during a random access response (RAR) window. In response to determining that no second message is received by the UE from the BS or a back off indicator is received within the RAR window, the UE re-transmits the preamble and payload of the first message after the RAR window lapses. In response to determining if the second message received within the RAR window carries a FallbackRAR or SuccessRAR, the UE then determines to re-transmit the payload of the first message based on the FallbackRAR, or to transmit an acknowledgement message based on the SuccessRAR.