Apple Inc.
NPRACH configuration and format for unlicensed NBIoT system

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 .mu.s CP and two symbols are transmitted without a gap therebetween. When six subframes are used, four symbol groups each having a 266.7 .mu.s CP and five symbols are transmitted without a gap therebetween.