CAJ | 학술논문

本文将WSN中所有节点都看作处于不同层次的sink节点,通过对网络应用语义性描述得到任务模型,将其作为传感器节点传输及处理的基本单位,就此提出了一种基于任务(Task-based,TB)的混合MAC协议.TB-MAC中簇头(上层sink)首先广播任务,接收到广播且能部分或全部完成任务的节点采用竞争方式发送应答,簇头确定参与任务执行的节点及子任务要求并确定各节点的TDMA发送时序.由于簇头进行了任务协商,使得参与任务的节点能够有效地去除节点数据间的冗余性,提高网络的性能.仿真结果显示,TB-MAC的能耗和时延性能较典型的S-MAC、Z-MAC以及ECR-MAC均有较大改善.
본문장WSN중소유절점도간작처우불동층차적sink절점,통과대망락응용어의성묘술득도임무모형,장기작위전감기절점전수급처리적기본단위,취차제출료일충기우임무(Task-based,TB)적혼합MAC협의.TB-MAC중족두(상층sink)수선엄파임무,접수도엄파차능부분혹전부완성임무적절점채용경쟁방식발송응답,족두학정삼여임무집행적절점급자임무요구병학정각절점적TDMA발송시서.유우족두진행료임무협상,사득삼여임무적절점능구유효지거제절점수거간적용여성,제고망락적성능.방진결과현시,TB-MAC적능모화시연성능교전형적S-MAC、Z-MAC이급ECR-MAC균유교대개선.
The sensor nodes in a WSN are considered as the sinks at different levels, and then the task model is developed by the semantic description of the WSN application, which serves as the basic unit employing by the nodes for data transferring and processing. Based on the task model, the hybrid scheduled TB-MAC (Task-based MAC) is put forward. The nodes compete with each other for the shared channel to reply the broadcasted by the cluster to request sub-task, and a variable slot length TDMA scheme is adopted to schedule the nodes selected by the cluster according to their answers to carry out sub-tasks so as to provide QoS guarantees. The redundancies among data of the nodes could be eliminated efficiently, leading to better network performance, because of the sub-task negotiation during the selection of the nodes. Simulation results demonstrate that TB-MAC achieves better per-formance in terms of energy and delay than the popular MAC protocols such as ECR-MAC, Z-MAC and S-MAC.