Uma nova classe de mensagens para redes IEEE 802.15.4

Wireless Sensor Networks are being increasingly recommended for use in noisy industrial environment. An interes- ting standard to be used is IEEE 802.15.4, but it does not have the appropriate mechanisms to meet all requirements of industrial communications. Thus, this paper presents an expansion in the use of this standard, and presents three proposals that minimize the impact of message loss due to electromagnetic noise, enabling different approaches to retransmit messages. To prove the effectiveness of the proposed approaches, a comparative analysis is made with mechanism of guaranties provided by the standard.