Delay-constrained low-cost routing method for wireless sensor network

The invention discloses a delay-constrained low-cost routing method for a wireless sensor network. The method comprises the following steps that: sensor nodes are synchronous and work in a low duty cycle mode; a sink node broadcasts an interest message packet over the whole network to initiate path establishment; a plurality of non-dominance paths from the sensor nodes to the sink node are established in the diffusion process of the packet; when one sensor node determines to forward the interest packet to the adjacent nodes, the packets are forwarded sequentially according to the working time slot of each of the adjacent nodes; according to the next hop information of the plurality of established non-dominance paths and the related path information, the path meeting the minimum hop number is selected by the nodes held by the packet; the nodes receiving the packet continuously forward the packet hop by hop until the packet arrives at the sink node; and if the path meeting the delay constraint does not exist, the packet is discarded. The method has distribution characteristics, the delay-constrained low-cost path from each sensor node to the sink node can be quickly established, and the packet can be forwarded conveniently.