US 12,126,404 B2
Simultaneous uplink and downlink transmission using multiple access points
Leif Wilhelmsson, Lund (SE); Lakshmikanth Guntupalli, Lund (SE); Miguel Lopez, Solna (SE); and Dennis Sundman, Sollentuna (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/639,636
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Sep. 18, 2019, PCT No. PCT/EP2019/075061
§ 371(c)(1), (2) Date Mar. 2, 2022,
PCT Pub. No. WO2021/052581, PCT Pub. Date Mar. 25, 2021.
Prior Publication US 2022/0302964 A1, Sep. 22, 2022
Int. Cl. H04B 7/024 (2017.01); H04B 7/06 (2006.01); H04W 16/14 (2009.01); H04W 72/542 (2023.01)
CPC H04B 7/024 (2013.01) [H04B 7/0617 (2013.01); H04W 16/14 (2013.01); H04W 72/542 (2023.01)] 18 Claims
OG exemplary drawing
 
1. A method performed by a first access point arranged to provide wireless communication access in unlicensed spectrum, the method comprising
determining that a first station is to transmit uplink data in an uplink transmission at a first frequency band in the unlicensed spectrum;
assigning a second access point for receiving the uplink transmission, wherein the second access point has a second coverage area that overlaps a first coverage area of the first access point;
selecting a second station targeted for downlink transmission that is scheduled at least partly simultaneous with the uplink transmission from the first station and at least partly overlapping the first frequency band, wherein selecting the second station is based on a spatial relationship between the first and second stations;
assigning antenna weights, for an antenna array of the first access point, to provide beamforming of the downlink transmission towards the second station and to provide a null towards the second access point;
assigning transmission powers of the uplink transmission from the first station and of the downlink transmission from the first access point such that a signal-to-interference-plus-noise (SINR) ratio at the second station will be above a first threshold, wherein the SINR is based on the following at the second station:
received signal power of the downlink transmission; and
received interference power of the uplink transmission plus noise within the first frequency band; and
transmitting the downlink transmission to the second station via the antenna array based on the assigned antenna weights, wherein the downlink transmission is transmitted at least partly in the first frequency band and at least partly simultaneous with the uplink transmission from the first station to the second access point in the overlapping coverage area.