Literature review of congestion avoidance system in wireless sensor network

Wireless sensor network are used for many application such as medical data transmission, military application and so on, having various characteristics and requirements. Due to this it is very difficult to decide hardware and software requirements of the Wireless Sensor Network. In WSN there are two types of nodes as source node and sink node which are used for the transmission of the data. While transmitting these signal to the destination there are different problems as transmission rate, required bandwidth, tolerable packet loss, delay demands, etc. Energy requirements also includes things in terms of computational power, energy supply, storage capacity and lifetime of the network. There are different problems occurs in the transmission of WSN data major problem as congestion. Congestion is the state of buffer overloading and causes the loss of data packet and delay of transmission. Congestion may lead to problems as wrong diagnosis in medical application also lack of signal may result in death of patient. In this paper, different techniques studied for congestion avoidance in wireless sensor network.