It m
ay send 3 frames in the network layer: a layer to
network layer to a node sends data frame; the network layer due to the path can use can not find, need to broadcast RREQ frame starts the route discovery process; the network layer of the RREQ message is received, meet the conditions required to send the RREP message to the source node. When the network layer to send data frames, the active path will first arrive at the destination node in the local routing table lookup. If you find the path, the data frames transmitted along the path; if no path is found, will be the first to send the data frame buffer, and then calls the routing module, generating a RREQ message, starting the routing
discovery process.
When the network layer receives a data
frame, the destination node first checks whether the data
frame for this node.
If the node, the network layer of the
frame head of the data frame removed, transmits the data to a destination node; if not for the nodes, the network layer in the local routing table look up to a destination node in the next hop. If it find a next hop address, the data frame is forwarded to the next hop to continue; if there is no next hop address, network layer needs to generate the RREQ message, start the routing discovery process. When the network layer receives a RREQ message, RREP message or other command frame, it will be handed over to the routing module for processing. The micro grid adjacent using different frequency bands or time frequency code (here referred to as channel) in order to reduce the micro
interference between networks. Each micro grid
is
composed of a plurality of terminal DEV, where it is a higher priority to the DEV as a micro grid PNC, and it is responsible for the network management. The same within the micro grid DEV for end-to-end communication. Micro media access control network based on the timing of super
frame structure, as shown in figure 7