In this paper, by adopting the analytical framework of dynamical systems theory, a new congestion control (CC) algorithm for Multipath TCP (MPTCP) streaming services is developed.The proposed nonlinear algorithm, following an onoff principle, is formally demonstrated robust with respect to variable network conditions.It maintains stream consistency at the negotiated video rate despite a priori unknown delay fluctuations.Also, precise guidelines for buffer size allocation at the receiver are provided.The designed algorithm is compared against the established MPTCP CC algorithms: LIA, OLIA, BaLIA, and wVegas.The tests, conducted in open networks using real devices and equipment, show that the on-off controller reduces protocol delay, jitter, and Head-of-Line blocking, which is crucial for ensuring high-quality streaming in mobile networks. Index Terms-MPTCP, congestion control,