CPC H04W 74/0841 (2013.01) [H04L 5/0012 (2013.01); H04L 5/0053 (2013.01); H04L 27/2607 (2013.01); H04W 4/80 (2018.02); H04W 72/0453 (2013.01); H04W 76/27 (2018.02)] | 15 Claims |
1. A method for a wireless device for transmitting a random access preamble, the method comprising:
receiving system information configuring a plurality of narrowband physical random access channel, NPRACH, bands, each NPRACH band corresponding to one coverage class of a plurality of coverage classes, for each of the configured NPRACH bands, three bits in the system information indicate a tone index corresponding to a starting subcarrier of that NPRACH band, the tone index being based on a number of tones per NPRACH band, system bandwidth, and a number of random access channel bands;
determining a coverage class of the plurality of coverage classes based on a parameter associated with the network node and the wireless device;
selecting one NPRACH band of the plurality of NPRACH bands based on the determined coverage class; and
transmitting the random access preamble on a location within a frequency band, the random access preamble corresponding to a frequency hopping random access preamble over the selected NPRACH band, the location being based on the tone index of the selected NPRACH band.
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