SR-MAC： A Low Latency MAC Protocol for Multi-Packet Transmissions in Wireless Sensor Networks

• Published in: Journal of computer science and technology Vol. 28; no. 2; pp. 329 - 342
• Main Author: 唐宏伟 曹建农 刘雪峰 孙彩霞
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.03.2013; Springer Nature B.V; School of Computer, National University of Defense Technology, Changsha 410073, China%Department of Computing, Hong Kong Polytechnic University, Kowloon, Hong Kong, China
• Subjects: Access control; Analysis; Artificial Intelligence; Computer Science; Computer simulation; Data Structures and Information Theory; Delivery scheduling; Energy consumption; Information Systems Applications (incl.Internet); Listening; MAC协议; Network latency; Networks; Nodes; Packet switched networks; Packet transmission; Protocol; Protocol (computers); Regular Paper; Reserves; Schedules; Scheduling; Sensors; Simulation; Sleep; Software Engineering; Strontium; Studies; Synchronous; Theory of Computation; Wireless communications; Wireless networks; Wireless sensor networks; 事件检测; 介质访问控制; 传感器节点; 低延迟; 数据包传输; 无线传感器网络; 检测应用; duty cycle; medium access control protocol; event delivery latency; event delivery ratio; synchronous
• ISSN: 1000-9000; 1860-4749
• DOI: 10.1007/s11390-013-1334-4

Event detection is one of the major applications of wireless sensor networks （WSNs）. Most of existing medium access control （MAC） protocols are mainly optimized for the situation under which an event only generates one packet on a single sensor node. When an event generates multiple packets on a single node, the performance of these MAC protocols degrades rapidly. In this paper, we present a new synchronous duty-cycle MAC protocol called SR-MAC for the event detection applications in which multiple packets are generated on a single node. SR-MAC introduces a new scheduling mechanism that reserves few time slots during the SLEEP period for the nodes to transmit multiple packets. By this approach, SR-MAC can schedule multiple packets generated by an event on a single node to be forwarded over multiple hops in one operational cycle without collision. We use event delivery latency （EDL） and event delivery ratio （EDR） to measure the event detection capability of the SR-MAC protocol. Through detailed ns-2 simulation, the results show that SR-MAC can achieve lower EDL, higher EDR and higher network throughput with guaranteed energy efficiency compared with R-MAC, DW-MAC and PR-MAC.