US 9,813,202 B2
Interference cancellation in wireless networks
Bengt Lindoff, Bjarred (SE); Niklas Andgart, Sodra Sandby (SE); and Fredrik Nordstrom, Lund (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (publ), Stockholm (SE)
Appl. No. 14/405,706
Filed by Bengt Lindoff, Bjarred (SE); Niklas Andgart, Sodra Sandby (SE); and Fredrik Nordstrom, Lund (SE)
PCT Filed Sep. 28, 2012, PCT No. PCT/EP2012/069242
§ 371(c)(1), (2) Date Dec. 4, 2014,
PCT Pub. No. WO2013/185854, PCT Pub. Date Dec. 19, 2013.
Claims priority of provisional application 61/659,745, filed on Jun. 14, 2012.
Prior Publication US 2015/0146679 A1, May 28, 2015
Int. Cl. H04B 1/04 (2006.01); H04J 3/00 (2006.01); H04L 5/00 (2006.01); H04B 1/7103 (2011.01); H04J 11/00 (2006.01)
CPC H04L 5/0032 (2013.01) [H04B 1/7103 (2013.01); H04J 11/0056 (2013.01); H04L 5/0007 (2013.01); H04B 2201/70702 (2013.01); H04B 2201/70707 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method in a wireless device for interference cancellation (IC) in a cellular radio network system comprising a serving network node serving said wireless device, the method comprising:
determining whether an interfering symbol of an interfering radio signal present in a time slot of a signal received from the serving network node is a time aligned symbol or whether the interfering symbol is a non-time aligned symbol;
when the interfering symbol is the time aligned symbol, using a first IC method for at least partly removing the time aligned symbol from at least a first symbol in the time slot of the signal received from the serving network node; and
when the interfering symbol is the non-time aligned symbol, using a second IC method, different from the first IC method, for at least partly removing the non-time aligned symbol from at least the first symbol in the time slot of the signal received from the serving network node,
wherein the second IC method comprises estimating a portion of the interfering radio signal that is present in the time slot using an estimation method that utilizes information about slot timing in the interfering radio signal; and
subtracting the estimated portion of the interfering radio signal from the received signal.