A Dynamic Time-slot Assignment for Ground Wireless Sensor Network

Abstract

This paper is on the background of the applied communications of automated vehicle in the multi-hop environment. The paper provides a dynamic time-slot assignment protocol for the ground wireless sensor network (WSN), based on TDMA. By interacting of the two-hop neighboring nodes information, the protocol finishes the dynamic time-slot assignment, realizes the efficient and fair sharing of channel, reduces the transfer delay of the end-to-end burst data, meets the communication demand of assignment on-demand in WSN, and prolongs the life-time of the network with the virtual backbone mechanism. The theoretical analysis and simulation results showed that the protocol provided has better adaptability for the burst network services and topological variation, comparing to the traditional static mac layer protocol in the TDMA system. multiple address (TDMA), automated vehicle 1. Background WSN has widely used in various fields, especially in the military field. It is well suited to use in the wretched battlefield environment, including monitoring our forces, materials and equipment, keeping watch over the conflict zones, detecting the topography and defensive of the enemy, aiming the targets, assessing the damage, detecting the nuclear, biological and chemical attacks. WSN on the ground is disposed into three parts: the lowest part is the smallest and lowest power consumption attended sensor, the second part is the directional sensor which could assess the azimuth and the third part is the confirmed sensor which has a imaging ability. The first two parts only need slow communications (kbps) between each other and the communication distance is 100-400 meters. The confirmed sensor in the third part need two-speed or two transceivers (Mbps), the one is responsible for the communication with the lower node and the other one is responsible for the communication with the directorial node in a distance which could not exceed 10km. Based on the communication of the ground sensor by using unmanned vehicle in mobile multi-hop, a MAC protocols for the ground wireless network is designed, a TDMA-based dynamic TSA protocol is proposed, this protocol can complete the TSA process by the communication between two neighboring nodes, which can realize the sharing of the high-quality and fair-minded signal path, fulfilling the demand to distribute the communication according to need for the ground wireless network at the same time. This review is followed by an introduction. A brief summary of some of the relevant concepts is presented in Section 2.Section 3 demonstrates the protocol design. Section 4 is the theoretical performance study of the protocol. In Section 5, we discuss the preliminary results of a simulation study. Finally, conclusions and future work are summarized.