
10-6 Industrial Communication Systems
preamble and stay awake to receive this message. e drawbacks of this approach are overemitting for
the preamble and overhearing at nodes not involved (addressed) in the communication as they need to
stay awake until the preamble ends to check the message. More energy ecient are X-MAC [BYAH03]
and CSMA-MPS [MB04], where multiple short messages, with the relevant node address, are repeated
instead of a single long preamble. is not only avoids the overhearing of nodes that are not involved, but
also allows interested nodes to indicate when they are awake and ready to receive. e downside of these
asynchronous ...