US 11,057,944 B2
MBMS and PMCH in unlicensed bands
Havish Koorapaty, Saratoga, CA (US); Jung-Fu Cheng, Fremont, CA (US); and Amitav Mukherjee, Fremont, CA (US)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 16/308,341
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jun. 9, 2017, PCT No. PCT/IB2017/053431
§ 371(c)(1), (2) Date Dec. 7, 2018,
PCT Pub. No. WO2017/212456, PCT Pub. Date Dec. 14, 2017.
Claims priority of provisional application 62/348,527, filed on Jun. 10, 2016.
Prior Publication US 2019/0191456 A1, Jun. 20, 2019
Int. Cl. H04W 74/08 (2009.01); H04L 5/00 (2006.01); H04L 27/00 (2006.01); H04L 1/16 (2006.01); H04W 4/06 (2009.01); H04W 72/04 (2009.01); H04W 16/14 (2009.01)
CPC H04W 74/085 (2013.01) [H04L 1/1692 (2013.01); H04L 5/005 (2013.01); H04L 5/0053 (2013.01); H04L 27/0006 (2013.01); H04W 4/06 (2013.01); H04W 72/0446 (2013.01); H04W 74/0808 (2013.01); H04W 74/0816 (2013.01); H04L 5/001 (2013.01); H04W 16/14 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of operation of a radio access node to enable multi-cast transmissions on a carrier in an unlicensed spectrum, comprising:
performing a Listen-Before-Talk, LBT, procedure on a carrier in an unlicensed spectrum based on random backoff and a contention window size prior to a multi-cast transmission; and
transmitting the multi-cast transmission if the LBT procedure determines that the carrier in the unlicensed spectrum is Idle;
wherein a backoff counter for the LBT procedure is determined based on reception of preambles from radio access nodes of a same or different technology.