# An Energy-Efficient Routing Protocol for Reliable Data Transmission in Wireless Body Area Networks
## 5 Experimental Results
Considering the transmission efficiency and available bandwidth of nodes, reliable transmission between nodes can be guaranteed. Therefore, the probability of successful data transmission per unit time is higher, and the throughput is also increased. The lower throughput of the PERA and NEW-ATTEMPT protocols is because neither of them considers reliable communication between nodes. Therefore, the probability of data being successfully transmitted to the sink in a unit time is low, which greatly affects the throughput of the network. Moreover, the network lifetime and network stability period of the other two protocols are also lower than the proposed protocol. Therefore, the throughput is also low. Figure 4: Analysis of network lifetime. In order to analyze the energy efficiency of routing protocols, it is necessary to detect the energy utilization of each round. Figure 7 shows the energy consumption of the proposed protocol against the other two protocols. The result presents that the energy efficiency of this protocol is higher than PERA and NEW-ATTEMPT. The curve of the PERA protocol declines faster, because its routing method is too simple. Due to the large communication distance, the routing method with the minimum hop count will cause a low probability of successful data transmission. Therefore, most energy of the PERA protocol is used for data retransmission, and the energy utilization efficiency of this protocol is low. Similarly, the NEW-ATTEMPT protocol does not consider reliability parameters when constructing the cost function, which also results in a large transmission failure rate, and most energy of the NEW-ATTEMPT protocol is also used for data retransmission. However, the cost function takes the residual energy parameters into account. Compared with the PERA protocol, the protocol is slightly higher in energy utilization efficiency. The proposed protocol in this paper constructs a maximum benefit function to  
Figure 5: Analysis of network lifetime. Figure 6: Analysis of network throughput. synthetically evaluate the parameters of the nodes to select the nodes with a relatively good state as the next hop, and improve the energy efficiency. Therefore, the energy efficiency curve is relatively gentle. In order to show that this protocol supports reliable transmission of high-priority data, it is necessary to track and record the data of P1 priority. Figure 8 is a comparative analysis of the three protocols on reliability transmission of P1 priority data. From the trend of the lines in the figure, we can see that the successful transmission probability of P1 priority data in this protocol is more than 90%. This is because a maximum benefit function is constructed, and the benefit function sets different weight values for P1 priority data, which can better ensure the reliability of high-priority data transmission. The PERA protocol considers the priority design of data, but the route with minimum hops cannot guarantee the reliable transmission of emergency data, so its corresponding line trend is declining. The NEW-ATTEMPT protocol does not consider the priority of data, so it cannot guarantee the reliable transmission of high-priority data. Its line trend is gentle but low and only stable at about 23.5%.