US 12,069,743 B2
Narrowband internet of things random access channel configuration design
Xingqin Lin, Santa Clara, CA (US); Ansuman Adhikary, Hyderabad (IN); Johan Bergman, Stockholm (SE); Yufei Blankenship, Kildeer, IL (US); Asbjörn Grövlen, Stockholm (SE); Hazhir Shokri Razaghi, Solna (SE); Yutao Sui, Solna (SE); and Yi-Pin Eric Wang, Fremont, CA (US)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Jan. 26, 2022, as Appl. No. 17/585,129.
Application 17/585,129 is a continuation of application No. 16/084,805, granted, now 11,272,550, previously published as PCT/SE2017/050259, filed on Mar. 16, 2017.
Claims priority of provisional application 62/309,391, filed on Mar. 16, 2016.
Prior Publication US 2022/0150988 A1, May 12, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 72/0453 (2023.01); H04L 5/00 (2006.01); H04L 27/26 (2006.01); H04W 4/80 (2018.01); H04W 74/0833 (2024.01); H04W 76/27 (2018.01)
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
OG exemplary drawing
 
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.