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Chapter 2
Wireless Network Concepts
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2.4.2 Tree Networks
A Tree network may contain the full range of node types - Co-ordinator, Routers and
End Devices - with the Co-ordinator at the top of the (inverted) tree. Any node can only
communicate directly with its parent and children (if any). Thus, a message for a
remote node must be passed up the tree until it can passed down to its destination.
2.4.3 Mesh Networks
A Mesh network may contain the full range of node types - Co-ordinator, Routers and
End Devices. Any routing node (Router or Co-ordinator) can communicate directly
with any other routing node within radio range. However, an End Device can only
communicate directly with its parent. When sending a message between two nodes
that cannot communicate directly, the message is routed via intermediate routing
nodes (for which there may be more than one possible route).
Figure 29: Tree Network
Figure 30: Mesh Topology
Indicates route taken by
message
Indicates route taken by
message, although a
number of alternative
routes are available