公开(公告)号：US10959270B2

公开(公告)日：2021-03-23

申请号：US16446177

申请日：2019-06-19

Applicant: Apple Inc.

Inventor： Huaning Niu ,  Wenting Chang ,  Qiaoyang Ye ,  Salvatore Talarico ,  Rongrong Sun

IPC: H04L12/28 ,  H04W74/08 ,  H04L5/14 ,  H04L29/08 ,  H04W72/04 ,  H04W4/70 ,  H04J1/16 ,  H04W88/02

Abstract: Systems and methods of providing a NPRACH preamble in a multefire system are described. A UE configured for multefire NB-IoT or eMTC operation receives, from an eNB, access information that includes a SIB on a narrowband channel of an unlicensed band. Based on the access information, the UE transmits a NPRACH preamble in two or six contiguous uplink subframes. The NPRACH preamble is transmitted in two or six contiguous subframes. When two subframes are used, four symbol groups each having a 266.7 μs CP and two symbols are transmitted without a gap therebetween. When six subframes are used, four symbol groups each having a 266.7 μs CP and five symbols are transmitted without a gap therebetween.