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Multipath TCP (MPTCP) is an experimental protocol currently under standardization in the IETF. MPTCP allows to use multiple TCP connections for one data transmission if at least one of the endpoints is multi-homed. For example, this can be a mobile device with a Wi-Fi and a 3G interface. It is assumed that the paths are disjoint or partly disjoint. As such these paths have different transmission characteristics, like speed or delay. With MPTCP the congestion control of each single TCP transmission is coupled in such a way that the transmission data is distributed over all sub-paths depending on the load situation on each path.
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