Research On Routing Protocol In Transoceanic Civil Aeronautical Ad Hoc Networks

Following the booming of the mobile Internet, providing the passengers with broadband data communication has become a tendency in the domain of civil aviation. For now, airliners can be connected to the Internet mainly through satellites while in a transoceanic flight, whose end-to-end delay is great, bandwidth is limited and cost is high. It has become a research hotspot to develop a transoceanic aeronautical mobile communication system with aeronautical Ad Hoc networks. The characteristics of transoceanic civil aeronautical Ad Hoc networks such as large network scale, fast-shifting nodes, and limited bandwidth determine that routing protocols of conventional Ad Hoc networks don’t work anymore. Therefore, it is of great significance to design a reliable and effective routing protocol aimed at transoceanic civil aeronautical Ad Hoc networks’ feature.This article takes insight into transoceanic civil aeronautical Ad Hoc networks’ traits, sums up domestic achievements on aeronautical Ad Hoc networks, then lucubrates the mechanism of MRPPS routing protocol(Multipath Routing Protocol based on Path Stability). Contraposing the limitation of MRPPS, this article puts forward an improved routing protocol based on cross-layer, CL-MRPPS. The main work is as follows:① Implements load aware based on cross-layer and load balancing with parallel multipath routing. Since MPPRS only uses one primary path to forward data, and the spare path is enabled only if the primary path fails to work, congestion appears when the load becomes heavy. Taking these limitations into account, CL-MRPPS extracts the length of interface queue complying with the principle of cross-layer to sense the load of the network, and employs a number of paths to transfer data to achieve load balancing.② Reduces the correlation of multiple paths. The main path and spare one of MRPPS are highly overlapped, which is against load balancing. CL-MRPPS utilizes forward-best-request strategy to forward routing discovery packets, ensuring that different paths of a node have different next hops. Thus this protocol improves the relevance of multiple paths.③ Extends the data link layer with multi-interface and multi-channel. In this paper, the channel is divided into a number of sub channels, and different paths of a node use different channels to transmit data. Thus the channel competition of nodes in the network is alleviated and the efficiency of parallel multi-path routing can be enhanced.④ Design and implementation. CL-MRPPS is designed from aspects of the extension of multi-interface and multi-channel, the establishment of forward and reverse routing, route maintenance and forwarding of data packets. Then, CL-MRPPS is implemented in NS2.The simulation shows that in transoceanic civil aeronautical Ad Hoc networks, CL-MRPPS can observably improve packet deliver ratio and throughput, and lesser the average end-to-end delay; moreover, it can reduce the delay jitter. Basically the CL-MRPPS is a reliable and efficient routing protocol.