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ROUTING PROTOCOLS
ZHLS requires GPS, which is not similar to ZRP and maintains
a high-level hierarchy for interzone routing. Location search is per-
formed by unicasting one location request to each zone. Routing is
done by specifying the zone ID and the node ID of the destination,
instead of specifying an ordered list of all the intermediate nodes
between the source and the destination. Intermediate link breakage
may not cause any subsequent location search. Since the network con-
sists of nonoverlapping zones in ZHLS, frequency reuse is readily
deployable in ZHLS.
3.5.2.1 Zone Map e network is divided into zones under ZHLS.
By making use of certain geolocation techniques such as GPS, each
node knows its physical location; then, it ca