ABSTRACT

WSN consists of many sensors, they need high throughput and network lifetime to get involved in communication. Duty Cycle is a key factor in sensor nodes to maintain sleep, active condition in the presence of overhearing, collisions of packets while data transmission between sensor nodes. The key challenge of sensor nodes is to attain high energy efficiency, throughput and low End-End Delay. This paper presents several of existing approaches for MAC protocol. They are (1) Synchronization between nodes (2) Mathematical Analysis (3) TDMA based MAC and (4) Cross-Layer Design. We proposed a new method for MAC protocol with variable duty cycle. Neighboring nodes follow same duty cycle and same active time. Far away nodes doesn’t maintain same duty cycle, hence their active time is not same. The duty cycle is maintained in synchronous way and adaptive manner among the nodes within the network. In this paper, a conventional MAC and proposed MAC are simulated using NS-2.35. Variable duty cycle approach in the proposed MAC with sleep and idle states for the nodes yields better throughput and energy efficiency with respect to other conventional technique. These results validate that the proposed variable DC-MAC is feasible for Wireless Sensor Network applications.

摘要

WSN 由许多传感器组成，它们需要高吞吐量和网络寿命才能参与通信。占空比是传感器节点保持睡眠、存在窃听时的活动状态、传感器节点之间数据传输时数据包冲突的关键因素。传感器节点的关键挑战是获得高能效、吞吐量和低端到端延迟。本文介绍了几种现有的 MAC 协议方法。它们是 (1) 节点之间的同步 (2) 数学分析 (3) 基于 TDMA 的 MAC 和 (4) 跨层设计。我们提出了一种可变占空比的 MAC 协议新方法。相邻节点遵循相同的占空比和相同的活动时间。较远的节点不保持相同的占空比，因此它们的活动时间不一样。占空比在网络内的节点之间以同步方式和自适应方式保持。在本文中，使用 NS-2.35 模拟了传统的 MAC 和提出的 MAC。所提议的 MAC 中的可变占空比方法具有节点的睡眠和空闲状态，相对于其他传统技术产生更好的吞吐量和能量效率。这些结果验证了所提出的变量 DC-MAC 对于无线传感器网络应用是可行的。