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Before I reply, just to make sure I understand your question and sketch right. You said that "The concrete wall has a frontpart consisting of isolation and bricks." 1) Is this brick wall self supporting or connected to concrete wall through some anchors? 2) The gap you show in the above sketch, is that isolation? To answer your question, 1) The balcony has self weight, weight of finishes as well as live load for which it needs to be designed. These loads will be transferred through the connection of balcony beam to the wall as well as through the steel wire. The very important this to notice is that due to the arrangement of balcony support system, your balcony beam will also have an axial load. I have marked the reactions. First step is to resolve the forces as reactions on the connection to the wall. This also requires checking the steel wire to make sure it has enough strength as well as the balcony beam and its connection to wall. Once you have done that, then you need to transfer the load (reaction of the balcony) to the foundation through the wall. If the wall is not connected to the concrete wall below, then you need to analyze the wall for this load and make sure it has enough flexural and shear strength to transfer this load in combination with other environmental loads like Wind and Seismic etc. it depends on how you are analyzing the wall. If you are using a software for example ETABS, you can model the openings in the software and design accordingly.