Research On Key Technologies Of Cross-Layer Optimization In The New Generation Tactical Internet

In military communication, tactical Internet is a communication network which is established to ensure the tactical corps and troops to carry out combat command. It provides the basic means of communication for the army and troops to carry out tactical combat, and implements the transmission and distribution of battlefield information. In the information-based war, its position and function is more and more outstanding, and it plays an important role. Using cross-layer technology can break the traditional network structure, achieve information sharing among each layer, reduce the overhead, improve the network performance, and make the network more applicable to the complex and changeable battlefield environment. Therefore, it’s of theoretical and practical significance to study the cross-layer technology of tactical Internet.Wideband network waveform is the most important and complex waveform in the U.S. military’s latest generation of tactical Internet. Wideband network waveform adopts the dynamic time-division multiple access with no center node to organize network. It has the characteristics of organizing temporarily, high mobility, reusing the time slot resource and high throughput, and it has a good performance in actual combat. The paper focuses on the studying the key technology of cross-layer optimization of wideband network waveform.Firstly, the paper analyzes the WNW Protocol stack structure, focuses on the research on USAP protocol using in the link layer and OLSR protocol using in the routing layer, and sum up some problems which can be improved by cross-layer optimization:(1) in order to complete the neighbor discovery process, the network layer and the link layer repeat interaction which is not necessary; (2) routing metric used in OLSR routing protocol is not suitable for complex and changeable battlefield environment.According to the problems above, the paper proposes a cross-layer optimization scheme for WNW:(1) acquire information in the physical channel, and calculate the transmission parameters of the link layer; (2) through the network layer and link layer sharing neighbor information, simplify and improve the OLSR routing protocol; (3) use the transmission parameters and design the routing metric for routing protocol, considering short link quality. Through information sharing among the physical layer, link layer and network layer in the WNW, the scheme improves the OLSR routing protocol, in order to reduce routing overhead, cut down network delay, and improve system throughput.Finally, the paper uses OPNET modeler to implement the cross-layer optimization scheme, and compares the performance between the new scheme and OLSR protocol using different routing metric. Experimental results show that, in the battlefield environment, the routing protocol using cross-layer optimization has better network stability, reduces the routing overhead, cuts down the network delay, and improve system throughput.In this paper, the research on cross-layer technology of wideband network waveform is helpful to the development of tactical network waveform. It provides an idea for the cross-layer design of wireless network, and it has great reference value in the development of tactical Internet in the army.