Concurrent　multipath　transmission　provides　an　effective　solution　for　streaming　high-quality　mobile　videos　in　heterogeneous　wireless　networks.　Rate　control　is　commonly　adopted　in　multimedia　communication　systems　to　fully　utilize　the　available　network　bandwidth.　This　paper　proposes　a　novel　rate　control　for　concurrent　multipath　video　transmission.　The　existing　rate　control　algorithms　mainly　adapt　bit　rate　in　the　short-term　pattern,　i.e.,　without　considering　the　long-term　video　transmission　quality.　We　propose　a　long-term　rate　control　scheme　that　takes　into　account　the　status　of　both　the　transmission　buffer　and　video　frames.　First,　a　mathematical　model　is　developed　to　formulate　the　non-convex　problem　of　long-term　quality　maximization.　Second,　we　develop　a　dynamic　programming　solution　for　online　encoding　bit　rate　control　based　on　buffer　status.　The　performance　evaluation　is　conducted　in　a　real　test　bed　over　LTE　and　Wi-Fi　networks.　Experimental　results　demonstrate　that　the　proposed　long-term　rate　control　scheme　achieves　appreciable　improvements　over　the　short-term　rate　control　schemes　in　terms　of　video　quality　and　delay　performance.