一种基于空间相关性的稠密无线传感器网络混和MAC协议

在消除传感器节点监测数据之间存在的空间冗余性的同时,尝试通过融合TDMA和CSMA两种模式来提高系统性能。提出的HS-Sift协议将感知区域划分为三个子区域,每个区域采取不同的信道接入方式。在HS-Sift协议下,感知区域边界的节点将主要处于休眠状态,靠近事件地的节点采用调度的方式发送数据以提高信道利用率,而中间部分的节点将采用竞争模式接入信道。模拟实验表明该协议能有效地降低能量耗费以及传输延时。

Hybrid Spatial Correlation-based Medium Access Control for Dense Event-driven Sensor Networks

In dense wireless sensor networks (WSN) applications, exploiting spatial redundancy has been proved to be energy efficient and MAC design affects the efficiency of reconstruction. CSMA was tried to seamlessly integrate with TDMA in the process of filtering out the spatial correlation, and a so-called HS-Sift hybrid protocol was proposed. The scheme divides the entire sensing region into three sub-areas and applies different channel access mechanisms to each part. Under the proposed scheme, nodes around the sensing region border will sleep most of the time, nodes near the event site are carefully scheduled to achieve high channel utilization and nodes lie between competing for the shared channel with different priorities. Extensive simulations verify the effectiveness of the proposed scheme in terms of energy consumption, medium access delay under the constraint of maximum reconstruction distortion.