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The present invention relates to a conjoint communication and sensing method for detecting the movement of an obstacle in the environment of a node in a wireless telecommunication network and, where applicable, localising this obstacle. The node divides its environment into angular sectors and measures, at a plurality of observation instants, a quantity characteristic of the signal-to-noise-plus-sector-interference ratio in each of these sectors (410-420) to form a sensing matrix (Γ τ, n (t)). A blind separation of sources is implemented to extract from this matrix a matrix of sector contributions (Γ τ, n (•)(t)) of the interfering signals (430). The movement of any obstacle is detected from the history of the sector contributions (440), which makes it possible, where applicable, to predict a blockage situation (450) and to modify the allocation of the radio resources accordingly (460).