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In all types of communication network, congestion is always an important issue. Congestion in wireless network cause loss of packets, longer delay and throughput degradation. In applications like multimedia, nodes typically produce large amount of data necessitates high transmission rates and more processing, a fundamental concern in Wireless Multimedia Sensor Networks. Many sources send data of different applications so weighted fairness is also required. To handle this type of scenario priority based congestion control techniques were discussed. The aim of this paper is to survey existing priority based congestion control techniques to classify them & to discuss their advantages and drawbacks. General TermsPriority based congestion control algorithms.

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