Joint Multicast Transmission and Channel Allocation Strategy for Data Dissemination in Vehicular Networks

The prosperity of advanced applications in vehicular networks leads to frequent data requests of vehicles, necessitating an increased emphasis on data dissemination capabilities. Multicast transmission, enabling the simultaneous delivery of data to multiple receivers, stands out as a spectrally efficient approach for data dissemination. However, existing approaches in multicast transmission strategy for vehicular networks largely ignore the interference that can arise between multicast links, which results in a degradation of system performance. In this paper, we investigate the issue of joint multicast transmission and bandwidth allocation strategy for enhancing data dissemination in vehicular networks and formulate a problem to maximize the number of packets effectively transmitted by optimizing multicast link establishment, transmitted packets and bandwidth allocation. Because of the coupling of variables in the formulated problem, we decompose the problem into two subproblems and propose the conflict graph based multicast transmission strategy and the graph coloring algorithm based bandwidth allocation strategy for each subproblem. Then, an iterative algorithm is designed for joint optimization. Extensive simulations demonstrate the advantages of proposed strategy.