Real-time communication routing method for wireless sensor network

Abstract

The invention discloses a real-time communication routing method for a wireless sensor network, and the real-time communication routing method comprises the steps of obtaining the transmission speed of data packets between a current node and all predecessor neighbor nodes of the current node by calculation according to communication delay between the current node and the predecessor neighbor nodes of the current node and queuing delay of the predecessor neighbor nodes after the current node receives the data packets which are sent from an upstream node to a base station node, taking the obtained transmission speed of the data packets as forwarding selection standard, and selecting the next hop of the node in a predecessor forwarding neighbor table to forward the data packets. The real-time communication routing method can effectively ensure that the data packets can select a path with higher efficiency for forwarding during the real-time forwarding process, reduce transmission time delay of the data packets and simultaneously improve the transmission reliability of the data packets.

Description

technical field [0001] The invention relates to a wireless sensor network technology, in particular to a real-time communication routing method for the wireless sensor network. Background technique [0002] At present, wireless sensor networks have begun to be applied in fields such as environmental monitoring, battlefield real-time tracking and traffic control. These applications usually have high requirements on the real-time performance of the network, and it is necessary to ensure that the data collected by the sensor nodes in the network can be sent to the base station nodes in real time. [0003] Taking the application of wireless sensor networks in forest fire prevention as an example, the sensor nodes deployed in the monitoring area are responsible for monitoring whether there is a fire. When the ambient temperature in the monitoring area is normal, the sensor node collects the temperature data and sends the data to the base station in a non-real-time transmission m...

AI Technical Summary

Problems solved by technology

Although the SPEED protocol implements the routing hole avoidance mechanism based on the reverse pressure beacon, it still has a lot of shortcomings: on the one hand, because the SPEED protocol does not allow "negative speed", the data packets arriving at the routing hole will be discarded; On the one hand, the upstream node notified by the reverse pressure beacon may still continue to send data packets to the routing hole area through other paths, resulting in a high data packet loss rate

Assuming that sensor node 1 also selects sensor node 3 as the next hop node, since the average transmission delay of the only sensor node 2 in the predecessor forwarding neighbor table of sensor node 3 is infinite, there is no suitable next hop node that can satisfy the application Delay requirements, all data packets received by sensor node 3 will be discarded, resulting in a waste of energy

The main reason for this phenomenon is that although the reverse pressure beacon can effectively inform the upstream node that there is a routing hole, it cannot notify other sensor nodes not to send data packets to quasi-hole nodes such as sensor node 3, thus caused packet loss

[0013] And as Figure 2b In the example of routing hole avoidance mechanism shown, if the predecessor neighbor node of sensor node 1 is only hole node 2, then all data packets detected by source node 0 cannot be transmitted successfully. Obviously, this is very important for real-time applications such as fire monitoring. unacceptable

The simulation experiment on the J-Sim platform shows that when there is a hole node in the network, although the routing hole avoidance mechanism of the SPEED protocol uses the reverse pressure beacon, the serious loss of the data packet is caused by the routing hole, thereby reducing the Network data arrival rate, while wasting a lot of network energy

Images