Wireless sensor network consists of hundreds to thousands of sensor nodes gathering various data including temperature, sound, location, etc. They have been applied to numerous fields such as healthcare, monitoring system, military, and so forth. It is usually difficult to recharge or replace the sensor nodes which have limited battery capacity. Energy efficiency is thus a primary issue in maintaining the network. Apart from that an unbalanced load allocation results in congestion. Load

more »

... g is of great importance in wireless sensor networks because of the limited resource constraint. By keeping dynamic metrics such as network load, load balancing can be achieved and congestion can be avoided. The multipath routing decision in network layer has an important impact on the performance of WSN.