caption: 9 GBR Gradient-based routing -- Another variant of directed diffusion -- To memorize the number of hops when the interest is diffused through the whole network -- As such, each node can calculate a parameter called the height of the node, which is the minimum number of hops to reach the BS -- The difference between a node's height and that of its neighbor is considered the gradient on that link -- A packet is forwarded on a link with the largest gradient
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