Exact(41)
The tables need to be cleared periodically are the neighbour table and the routing table.
The EHRP could reduce the path length effectively by using the neighbour table information.
Neighbours are added to the neighbour table by asking all the network protocols.
Node S (source) checks its neighbour table for location information of Node D (destination).
However, there is no such content in the neighbour table in the ZigBee specification.
Thus, all the necessary information needed in rejoining could be acquired in maintaining daily neighbour table.
Similar(19)
The information in neighbour tables was used to get the shorter paths.
Considering the overhead, if a certain device has announce its neighbour nodes from another cluster, all its descendants may be allowed to not monitor their neighbour tables anymore.
In ZigBee specification, all ZigBee devices are required to maintain neighbour tables, which record the information of the nodes in their one-hop neighbourhood.
Note that due to the limited transmission range of the ZigBee nodes, it is possible that two neighbours of the ZC may not find each other in their own neighbour tables.
In Figure 1, nodes 1 and C can find each other in their neighbour tables, so it is the case with nodes D and 3; therefore, it can be concluded that cluster 1 is adjacent to clusters 2 and 3.
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