Telefonaktiebolaget Lm Ericsson (publ)

Weilan Huang

Yang Hu

Jie Mao

A method and a radio base station are provided for selecting a first User Equipment (UE) and at least a second UE from a plurality of UEs, for sharing a transmission resource in the time-frequency dimension in a multiple input multiple output (MIMO) transmission. A first and second imperfection of Channel State Information (CSI) made available for the first UE and second UE, respectively is estimated (). Spatial correlation between the first UE and the at least second UE is estimated (), and the first and at least second UE are selected () to share a transmission resource in the time-frequency dimension, if both of the first and second imperfections are determined above () a first threshold and the spatial correlation is determined below () a second threshold.

Two-dimensional UE pairing in MIMO systems

The present invention proposes a method, a radio base station and a wireless communication system for optimizing Inter-cell Interference Coordination, wherein a user equipment is communicated within a cell served by the radio base station, comprising: obtaining one or more channel conditions on the communication channel between the user equipment and the radio base station, establishing a utility function as a function of Signal to Interference-and-Noise Ratios SINRs to model the user equipment's satisfaction level in terms of quality of service and power consumption based on the obtained channel conditions, selecting a SINR that enables to maximize the value of the utility function as a target SINR, and determining a transmit power to be used by the user equipment as a function of the target SINR. Thus, a self-optimized inter-cell interference coordination (ICIC) without X2 signaling between base stations is achieved and greedy power allocation is avoid.

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Beijing, China

Weilan Huang