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In this work, we propose a novel rate control algorithm for Versatile VideoCoding (VVC) standard based on its distinct rate-distortion characteristics. Bymodelling the transform coefficients with the composite Cauchy distribution,higher accuracy compared with traditional distributions has been achieved.Based on the transform coefficient modelling, the theoretically derived R-Q andD-Q models which have been shown to deliver higher accuracy in characterizingRD characteristics for sequences with different content are incorporated intothe rate control process. Furthermore, to establish an adaptive bit allocationscheme, the dependency between different levels of frames is modelled by adependency factor to describe relationship between the reference andto-be-coded frames. Given the derived R-Q and D-Q relationships, as well as thedependency factor, an adaptive bit allocation scheme is developed for optimalbits allocation. We implement the proposed algorithm on VVC Test Model (VTM)3.0. Experiments show that due to proper bit allocation, for low delayconfiguration the proposed algorithm can achieve 1.03% BD-Rate saving comparedwith the default rate control algorithm and 2.96% BD-Rate saving compared withfixed QP scheme. Moreover, 1.29% BD-Rate saving and higher control accuracyhave also been observed under the random access configuration.

High Efficiency Rate Control for Versatile Video Coding Based on Composite Cauchy Distribution