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Broadcasting is a fundamental operation in a mobile ad hoc network (MANETs) protocols. The flooding is the simplest mechanism used for message broadcasting in MANETs in which a message is rebroadcasted, by each node, exactly once. Despite its simplicity, it can cause high redundancy retransmission that could generate messages contention and collision. However, the issue is finding a way to minimize the number of redundantly received messages in order to save transmission energy while maintaining good latency and high reachability. Several enhanced versions of the flooding mechanism have been proposed to alleviate this issue by inhibiting some nodes from rebroadcasting. The selection of relay nodes is a major design consideration in all enhanced versions. In this paper, a dynamic threshold-based probabilistic scheme (DTP) is introduced. In DTP, the threshold value at the nodes is dynamically adjusted using only information from neighboring nodes. Results are presented and show the efficiency of DTP in terms of reachability, saved rebroadcast, and average latency.

Information broadcasting in MANETs is an essential building block for cooperative operations, group discussions, and common announcements (e.g., filling routing tables). The flooding is the simplest broadcasting scheme used in MANETs. In this scheme, source nodes broadcast at once packets to all neighbors. Broadcasting through flooding causes increased messages redundancy, collision, and wastage of bandwidth and energy. Several approaches have been proposed to solve these issues and could be classified into two main categories: static schemes and adaptive schemes. In this paper, we introduce an adaptive scheme for information broadcasting in MANETs. This scheme allows nodes to select an appropriate action, either to rebroadcast or to discard receiving messages. The decision is based on the amount and timestamps of received messages. Simulations have been conducted and results show that the proposed scheme reduces the number of packet transmissions, has better latency and SRB, good reachability, and low energy consumption.