Telefonaktiebolaget Lm Ericsson (publ)

Paulo G Normando

Yuri C B Silva

Arne Simonsson

Niklas Wernersson

Sara Sandberg

Walter Cruz Freitas, Jr

Elvis M G Stancanelli

Darlan Cavalcante Moreira

Carlos I R Bandeira

Yuri CB Silva

Walter C Freitas Junior

A method performed by a network node for enabling Interference Alignment, IA, of transmissions to user equipments is provided. The network node receives signal strength values associated with more than one network node for the user equipments, wherein each signal strength value is associated with one network node. Then, the network node schedules a first group of the user equipments on radio transmission resources that are orthogonal to radio transmission resources of at least one other group of the user equipments when an IA gain value for each user equipment in the first group passes a threshold level. The IA gain value is determined by the network node based on the received signal strength values. The network node may then enable IA of transmissions to the scheduled first group of user equipments from at least two network nodes capable of performing IA of transmissions.

Network node and method for enabling interference alignment of transmissions to user equipments

In MU-MIMO scenarios, uncoordinated or external interference may be very significant. Such external interference can degrade the system performance as much as the internal interference. To address these problems, a desired signal subspace can be changed to avoid the external interference as much as possible. This technique can be applied in conjunction with systems that already cancel internal interference, such as Interference Alignment and Joint Processing. An original signal space may be broken down to desired and interference subspaces that are orthogonal to each other. The receiver can notify the transmitter of the boundary, and transmitter in turn can project the transmitted signal to fall into the desired subspace. The receiver can project the received signal into the desired subspace, which cancels everything not contained in the desired subspace.

Method and apparatus for adaptive cancellation of external interference

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Fortaleza-CE, Brazil

Paulo G Normando