US Patent 10291451 PRACH design for larger cell radius

Certain aspects of the present disclosure provide techniques for improving a physical random access channel (PRACH) design, for example, to support larger cell radius for communications in a wireless network. In aspects, a method of wireless communication by a user equipment (UE) is provided. The method generally includes receiving at least one configuration of a plurality of available narrowband physical random access channel (NPRACH) configurations or an indication of one of the plurality of NPRACH configurations. Each of the plurality of NPRACH configurations includes a different combination of at least two of a multi-level frequency hopping patter, cyclic prefix length, symbol group format, or tone spacing for NPRACH signals. The method also includes determining at least one resource within a plurality of available NPRACH resources according to the received configuration(s) or the received indication, and transmitting a NPRACH signal using the determined at least one resource.