Slot Resource Management Algorithms In Wireless Mobile Ad Hoc Networks

Mobile Ad Hoc network (MANET) is a new generation of wireless communication network. It is widely used in the national defense, salvation of calamity, remote-areas and so on which need temporary communicational environment or are hard to be supported by traditional network. Different from traditional one-hop wireless networks, MANET does not need centralized base station. The whole network is composed of multiple independent nodes. Every wireless node in MANET not only completes the functions of the traditional wireless node, but also works as a router and a coordinator. Resource management algorithm for traditional wireless networks can not be used efficiently in MANET. New resource management algorithms are needed for MANET. This dissertation focuses on the slot assignment algorithm in mobile Ad Hoc networks based on TDMA. It is to assign transmission schedules to nodes in the network. The objective of the slot assignment in MANET is to guarantee that neighboring nodes in the network can transmit without collision. The validity of the slot assignment algorithm plays an important role in enhancing the performance of the network transmission and utilizing rate of wireless resource..This dissertation first summarizes the current research status in slot assignment of MANET and analyzes the disadvantages of current algorithms. Then, a novel free-collision slots assignment (FCSA), which combines the advantages of FPRP (a five-phase reservation protocol) and P-TDMA(improvement Time Division Multiple access) and introduces a two layer protocol architecture, is proposed. This algorithm is distributed .Each node in the network calculates its transmission schedule according to the local information and can transmit data information in corresponding transmission slots without collision. Besides, nodes can adjust their slot assignment according to the change of the network topology. The main characteristics of this algorithm include low costs, high slots utilizing rate, and being easy to be achieved.OPNET is used in this dissertation to construct the MANET simulation platform. Simulation results show that in different network scenes, compared with current algorithms, our FCSA can greatly improve the packet delivery success rate and shorten media access delay.