TITLE Building Efficient Wireless Sensor Networks with Low-Level Naming AUTHOR Heidemann DATE 2001 LOCATION SOSP The authors replace topologically-assigned IP addresses with names which are either based on capabilities or on geographic location. They are examining the tradeoffs in radio-based sensor networks where, even though the nodes are fairly weak computationally, the cost of computation outweighs the costs in sending data over the network. Thus, if nodes can perform aggregation or other computation which will reduce the amount of data transfer, this is seen as a win. One highly motivating example taken from another context was: "[other researchers] observe that 3000 instructions could be executed for the same energy cost of sending a bit 100m by radio." On difficulty with their motivation was that they appeared to be saying that current sensor network designs did not scale to millions of nodes but their example of tracking animals in the forest did not really evoke a millions-of-nodes usage. In their design, nodes are not individually addressible; they are communicate hop-by-hop. Their choice of MAC protocols dominate energy measurements due to the fact that they are always listening for MAC information; they would like to introduce more energy-efficient protocols like PAMAS and TDMA in the future. Strangely, their relatively small network of about 12 nodes experienced pockets of congestion and had difficulty communicating quite often. Their mechanism is very similar to Declarative Routing from MIT's Lincoln Labs because the two groups collaborated.