Congestion Control Balancing Mechanism Based on Energy-Constraint in Mobile Delay Tolerant Network

Abstract

With the rapid development of Internet technology, the mobile terminal as a carrier get more and more popular, such as smart phones, tablet PCs and other mobile wireless communicated devices, so that the MDTN (Mobile Delay Tolerant Network) has become a hot topic in the wireless sensor networks. At the same time these mobile devices have the advantages of mobility and portability, but there are some problems such as limited battery power and limited bandwidth. In addition, MDTN could easily lead to a problem of network congestion. Therefore, the effective energy constraint strategy bringing in the congestion control mechanism is important issue for MDTN. In this paper, based on the existing routing protocol, congestion control mechanism, energy-saving mechanism in the mobile delay tolerant network, we propose congestion control balancing strategy with the consideration of the energy constraint. We take remaining cache and energy of nodes as a basis, and the nodes in the network are divided into different levels after the node receives the request of messages. For such a purpose, the proposed approach firstly checks the rank status at the mobile devices. It then adopts different strategies depending on the different levels. If the level is on the verge of congestion, it will take the packet dropping strategy. If the node is in a lower energy level, it will take the method of delaying receiving messages, and if the congestion level and energy level are at a low state, the node stops to receive messages. This method allows nodes that congestion level and energy level is lower to prioritized participate in the routing, so that controls network congestion and balances energy in the network. Simulation results show that the proposed algorithm improves the network congestion in the same network environment and extends the life of the entire network.