摘要：QoS and security are two important factors which influence the application of the wireless multimedia sensor networks. Multipath routing is an effective approach to transmit large multimedia data in sensor networks to satisfy the QoS requirements. This study focuses on QoS-aware trust evaluation model and trust-based workload balancing among node-disjoint multiple routing paths created by multipath routing protocols . First, the trust level of single sensor node is calculated based on packet-drop rate, residual-energy and packet delivery queue length separately. Then, based on the trust value of single sensor node, the trust level of the single routing path is evaluated. Also the trust value fusion method for multiple routing paths is proposed. The overall grouping of routing paths increases monotonically, as the more trusted routing paths are added into the routing path group. Based on the proposed QoS-aware trust model, a load balancing algorithm among routing paths is designed. Finally, the proposed trust evaluation method and trust based load balancing algorithm are well analyzed and simulated. The analysis and simulation results show that our QoS-aware trust model can effectively evaluate the trust level of node-disjoint multiple routing path and affords a new secure and QoS-aware reference for designing multipath routing protocols .
