基于数量和能量优先级的S-MAC协议的改进研究
发布时间：2018-10-10 16:44
【摘要】：无线传感器网络(Wireless Sensor Network)是一个多跳的自组织的无线网络,简称为WSN。WSN这种网络一般需要通过数量庞大的移动、定点感应装置通过多跳传输与自组织方式建立起的数据传递系统对信息进行收集整理、分析处理,再将收集到的信息分别传递给区域范围内需要该信息的网络用户[1]。在WSN中,网络数据在源节点中根据一定的机制被划分为不同的优先级。在数据帧中,将优先级信息和数据一起封装,实现其在网络节点间的传输,最终保证在转发节点或源节点间实现重要数据的快速传送。在无线传感器网络中,MAC协议处于传感器网络协议的底层部分,负责管理、协调用户共享的信道资源,因此,MAC协议对传感器网络的性能有较大影响。论文扩展了IEEE 802.11的数据帧,结合数据优先级和能量优先级对S-MAC协议进行了改进,解决数据优先级的携带问题。在发送数据时,根据发送数据和能量的优先级及网络负载情况,节点调整自己的竞争窗口,从而使网络中的高优先级数据优先传送,低优先级的数据推迟发送,达到分散竞争压力,减少碰撞次数的目的。本文为了提高实验的可行性,故采用NS2作为仿真实验平台,对文中所提出的改进方法进行仿真测试。实验结果表明,文中改进后的协议对高优先级数据的传输时延有明显地降低,在一定程度上均衡网络负载,延长了网络生存时间。
[Abstract]:Wireless sensor network (Wireless Sensor Network) is a multi-hop self-organized wireless network, known as WSN.WSN. The fixed-point induction device collects and processes the information through the data transmission system established by multi-hop transmission and self-organization, and then transfers the collected information to the network users who need the information in the region [1]. In WSN, network data is divided into different priorities in source nodes according to certain mechanisms. In the data frame, the priority information and data are encapsulated together to realize the transmission between the network nodes, and finally to guarantee the fast transfer of important data between the forwarding nodes and the source nodes. In wireless sensor networks (WSN), MAC protocol is the bottom part of WSN protocol, which is responsible for managing and coordinating the channel resources shared by users. Therefore, MAC protocol has a great impact on the performance of WSN. In this paper, the data frame of IEEE 802.11 is extended, and the data priority and energy priority are combined to improve the S-MAC protocol to solve the problem of carrying the data priority. When sending data, according to the priority of sending data and energy and network load, the node adjusts its own competition window so that the high-priority data in the network is transferred first, and the low-priority data is sent later. To achieve the goal of dispersing competitive pressure and reducing the number of collisions. In order to improve the feasibility of the experiment, this paper uses NS2 as the simulation experiment platform, and carries on the simulation test to the improved method proposed in this paper. The experimental results show that the improved protocol can significantly reduce the transmission delay of high-priority data, balance the network load to a certain extent, and prolong the network lifetime.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP212.9;TN915.04
，
本文编号：2262521
[Abstract]:Wireless sensor network (Wireless Sensor Network) is a multi-hop self-organized wireless network, known as WSN.WSN. The fixed-point induction device collects and processes the information through the data transmission system established by multi-hop transmission and self-organization, and then transfers the collected information to the network users who need the information in the region [1]. In WSN, network data is divided into different priorities in source nodes according to certain mechanisms. In the data frame, the priority information and data are encapsulated together to realize the transmission between the network nodes, and finally to guarantee the fast transfer of important data between the forwarding nodes and the source nodes. In wireless sensor networks (WSN), MAC protocol is the bottom part of WSN protocol, which is responsible for managing and coordinating the channel resources shared by users. Therefore, MAC protocol has a great impact on the performance of WSN. In this paper, the data frame of IEEE 802.11 is extended, and the data priority and energy priority are combined to improve the S-MAC protocol to solve the problem of carrying the data priority. When sending data, according to the priority of sending data and energy and network load, the node adjusts its own competition window so that the high-priority data in the network is transferred first, and the low-priority data is sent later. To achieve the goal of dispersing competitive pressure and reducing the number of collisions. In order to improve the feasibility of the experiment, this paper uses NS2 as the simulation experiment platform, and carries on the simulation test to the improved method proposed in this paper. The experimental results show that the improved protocol can significantly reduce the transmission delay of high-priority data, balance the network load to a certain extent, and prolong the network lifetime.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP212.9;TN915.04
，
本文编号：2262521
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