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Ad hoc network link layer protocol based on the space division of ultrashort wave

Author: HanCheng
Tutor: WuYuanMing
School: University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: Wireless ad hoc networks Directional antenna Air separation TDMA Network simulation OPNET
CLC: TN929.5
Type: Master's thesis
Year: 2009
Downloads: 95
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Abstract


How to design and optimize the link layer protocol to become one of the hotspots of the wireless ad hoc networks . First, the scheduling strategy based on the link layer protocol is usually TDMA ( Time Division Media Access ) based on the TDMA protocol improved method is the use of empty TDMA ( Spatial TDMA ) mechanism ; Second, directional antennas compared to omni-directional antenna can improve network performance. Therefore, the combination of both the advantages of design based on directional antenna STDMA media access control , link scheduling algorithm and Ad Hoc networking method . Firstly, this paper introduces the basic concepts and features of ultrashort wave self-organizing network of wireless ad hoc networks the main problems of current research and application prospects . Then elaborated of the ultrashort wave channel characteristics and advantages of directional antenna in the network space division multiplexing , antenna gain , and interference . The possibility of directional antennas for wireless ad hoc networks . Then expounded multiple access protocol . Analysis of the similarities and differences and the advantages and disadvantages of omnidirectional and directional antenna in networking and protocol . STDMA access protocol design based on directional antennas , and designed on the basis of the inter - layer interface, the link assignment policy , when a frame structure and a packet structure . By periodic updates of the link information table , the two-hop node information table and the slot assignment table to complete the access of the channel and the mapping of logical channels and transport channel . Directional transmission link maintenance at the same time , two-hop topology perception . The study found that the application of directional antennas , compared to omni-directional antennas can significantly improve the overall throughput of the network , reducing multiple access interference , improve the degree of spatial multiplexing . The STDMA way each node can guarantee conflict-free access channel and improve network connectivity . Design simulation platform OPNET node model TDMA- based air separation and directional antenna models , to achieve a specific network computer simulation model . Simulation results show that in the distributed model parameters environments , the the STDMA protocol guarantees node connectivity 4.8 / point topology stabilization time of less than 8 when , in high traffic load , compared with the CSMA / CA protocol network improved throughput , packet access delay is less than 250ms, not only can meet the specification requirements, but also to ensure the agreement of efficient and stable .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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