Research And Implementation Of Wireless Ad-Hoc Network Stack Based On IEEE802.15.4

Wireless sensor network is a new kind of information acquisition and perception system formed by a large number of micro sensor nodes through wireless multi-hop self-organizing network. It realizes the comprehensive perception of the real world by transmitting the monitoring data through the coordinator to remote information service center.As the technical standards and wireless transceiver technology are becoming more and more mature, wireless sensor network has begun to enter the stage of mass concrete application, switching from theory research to practical application. However the existing wireless sensor network solutions, especially wireless self-organized network protocol stack cannot absolutely meet the demand of practical applications. So this paper proposed a set of open-source low-power wireless ad-hoc network protocol stack from this perspective based on IEEE802.15.4standard along with the research, design and implementation of stack architecture, kernel and interfaces. The paper has also designed and implemented a set of hardware platform for testing the stack, the function and performance test results are also presented.The protocol stack with hierarchical architecture proposed by this paper is divided into hardware abstraction layer, kernel, protocol stack layer and application support layer. The kernel is based on the state machine, the protocol stack layer is based on CSMA/CA and TDM A channel access mechanism, and the cluster-tree LoPACH routing protocol.The hardware test platform is designed by using high-performance microcontroller STM32which is based on ARM Cortex-M3core, wireless transceiver AT86RF212and passive wake-up module APC240B. The node implemented is stable, reliable and of great performance, with low power dissipation when running the designed protocol stack.The wireless ad-hoc network protocol stack designed and implemented is of strong expansibility, compatibility, portability and excellent low-power performance. The test results show that it can meet the demand of practical applications, and has broad application prospects.