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SEAMAC能量协议

用于无线传感器网络的简易能量感知媒体访问控制协议（SEAMAC）
提供一项新的MAC协议——SEAMAC，该协议完全使用周期流量，以达到低能耗的目的。

SEAMAC的两个主要功能是：

实现周期流量的低占空比
在整个网络实现简易并独特的同步

对于网络监控应用程序来说，周期性采集物理变量十分有必要。该方法提前估算在一个时间间隔内应当采集多少样本，以及采集的具体时间。通过这个方法，避免了在两个采集样本之间空闲等待时大量能量的浪费。另一个改进措施是，它不需要使用任何机制去唤醒节点。

SEAMAC可以配置简单和稳健的同步。在网络中漏同步的频率被降到最低。只有基站开始和维护数据同步，这使得SEAMAC在整个网络中显得与众不同。其他节点的操作用于传播先前生成的同步数据。

Energy Protocol Seamac
Published: 23, March 2015

SIMPLE ENERGY AWARE MAC (SEAMAC) PROTOCOL FOR WIRELESS SENSOR NETWORKS:
A new MAC protocol, SEAMAC has been proposed which works with completely periodic traffic to achieve low energy utilization.

The two main functions of SEAMAC are:

Achieve low duty cycle for periodic traffic.
To achieve simple and unique synchronization in the whole network.
For network monitoring applications, it is necessary to sample physical variables periodically. This method gives an advance estimate of how many samples must be taken in a time interval and the specific instants when they are taken. In this way, a lot of energy is conserved by avoiding idle listening between two consecutive samples. Another improvement is that no mechanism is used to wake up the nodes.

Simple and robust synchronization is deployed in SEAMAC. The frequency of synchronization loses is minimizes in the network. Only the base station starts and maintains synchronization making it unique in SEAMAC for the whole network. The operation of other nodes is to broadcast synchronization packets previously generated.

SEAMAC时间进度制定——TIME SCHEDULING IN SEAMAC:

SEAMAC has a lot of advantages including periodic traffic of the entire network. Therefore, a schedule is created in which nodes only wake up when a sample from the environment has to be taken. Periodic listen/sleep schedule that is proposed in protocols like SMAC, TMAC and DMAC is not necessary in SEAMAC.

Another feature that is not essential for SEAMAC as compared to SMAC is that, it does not need a short wake up tone for the transmitting nodes. Since nodes know in advance when to turn on their radios to sample environmental variables. It is also important for packets from nodes to reach their destination which is the base station, in sequence and with low delay. Besides low energy consumption, listening periods in SEAMAC are long enough for all the packets to reach the base station before the lively interval finishes. The base station originates the synchronization packets which would have information about the time left for next listen period (tNLP) and the length of the sleeping period (tSP). The listening period should be noticeably large.

3.1.2 SEAMAC的同步设计——SYNCHRONIZATION IN SEAMAC:

Nodes of SEAMAC turn on their radios for listening to synchronization (sync) packets from the base station; when they are turned on. Since base station is the only node that starts and maintain synchronization and the other nodes only disseminate (spread) synchronization in a multi hop environment; energy is conserved and every node follows only one time schedule.

BS

Node

Node 2

Sync packet Tx

Sync packet Rx

The time