tailieunhanh - Artificial Intelligence for Wireless Sensor Networks Enhancement Part 5

Tham khảo tài liệu 'artificial intelligence for wireless sensor networks enhancement part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Routing Protocol with Unavailable Nodes in Wireless Sensor Networks 109 forward out this frame. Each sensor node has a flag bit that is set to disable when it becomes a unavailable node. The First Category of Sensor Nodes For the classification of the first category of sensor nodes we can make judgement according to the sensor node s energy sensory data network congestion status and so on under different situations. For example the battery voltage is in our developed sensor node. If the battery voltage of a sensor node is lower than it can not work. Thus when a sensor node s battery voltage is lower than we should decrease their work load and set it to a unavailable node. In the sensor node we use a 8-bit digit to represent the energy value and can be converted to 0 255 as shown in Eq. 3 . . 255 B A - L15 2 where A is the battery voltage of a sensor node and B is the converted energy value. When A B is 35 . when the energy value of a sensor node is lower than 35 we set it to a unavailable node. For the temperature we assume that the temperature is T the digital value representing the temperature is SOt . T d1 d-2 SOt 3 where d1 d2 and SOt of the temperature sensor SHT11 are shown in Tabs. 1 and 2 VDD d1 C 5v Table 1. Relationship between VDD voltage drain drain and d1 SOt d2 C 14bit 12bit Table 2. Relationship between SOt and d2 For example we assume that there occurs a disaster such as fire if the temperature is larger than 60 C. If the current VDD is the 14-bit digital SOt can be calculated as 9966 . if the temperature value in the sensor node is larger than 9966 we set the sensor node as a unavailable node. We use the number of route entries queue length and frame sending rate to judge whether the network load is heavy with three threshold values for them. If any one is larger than the corresponding threshold value then we think the sensor node is .

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