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Figure 10: Transmission cost reduction and reliability comparison of BRE and CTP. The graph above shows average number of transmissions per packet using BRE and traditional CTP for our experiments on MoteLab. The graph below shows end-to-end packet loss for the same experiments. The bar represents a node pair’s average of five experiments. The error bars represent the highest and the lowest average of the five experiments. The interpacket interval is 250 ms. For these experiment, the average retransmissions is 8.05% for BRE and 3.5% for CTP. The reduction in the number of transmissions in the case of BRE is mostly due to the reduction in the number of hops.