The invention provides an energy-saving method for the medium
access control layer in a
wireless mesh network, in which all nodes in the network, on the premise of
time synchronization, implementing a periodic synchronized awakening
handshake operation; for a node requesting for data sending, a brief awakening tone is sent firstly to inform the destination node of the intention of data sending at the moment of awakening
handshake, and then a
channel access method based on a competition mechanism is used for sending data frames; for a node without data sending request, a brief channel monitoring is performed firstly in order to detect channel activities at the moment of awakening
handshake, and if having sensed intention to send data from the node nearby, a receiving state is then kept in order to receive the upcoming data frames, otherwise, turning into
sleep mode immediately; and the dynamically changing of load and the
bursting flow are adapted by an adaptive awakening handshake mechanism, and the sensitivity of
network performance to the setting of 'Awakening
Handshake' cycle is reduced thereby. The invention enables all nodes in the network to carry out the on-demand awakening operation in a large extent with little cost, and therefore has a good energy-saving effect.