Wireless sensor network routing method based on software defined network

Abstract

The invention discloses a wireless sensor network routing method based on a software defined network. In the case of emergent service of a monitoring area, a monitoring center executes a routing adjustment process, and the method comprises the following steps: selecting an access node according to the dump energy of SDSN nodes, executing minimum hop routing discovery, calculating optimal access node transmitting power and link service flow rate matrixes according to a data service condition and a power upper limit of the access node in the network, generating a mirror image file according to the calculation result and transmitting the mirror image file to the SDSN nodes, receiving the mirror image file distributed by the monitoring center by the SDSN nodes, and reprogramming and adjusting the transmitting power and routing. The entire routing protocol can be verified on a platform which is established based on CC2530 and PC. The method is used for effectively decoupling a control plane and a data forwarding plane in the network, compensating the defects of poor astringency and adjustment delay of the traditional sensor network distributed algorithm and ensuring the stability and the robustness of the network.

Description

technical field [0001] The invention relates to a routing protocol for joint power control in an SDN-based heterogeneous wireless sensor network, and belongs to the field of routing protocols in wireless sensor networks. Background technique [0002] Wireless sensor network is an intelligent network information system that integrates information perception collection, fusion transmission and information processing functions. More than ten years of development has made the key technologies in wireless sensor networks such as routing and transmission protocols, topology control and data fusion mature, but at the same time it has also encountered bottlenecks: 1) Traditional WSNs are designed for specific applications, and hardware standards are different. Unified and difficult to reuse; 2), due to resource constraints such as node energy and computing power, WSN lacks elastic change capabilities, and node functions need to be manually updated to change configuration; 3), the di...

AI Technical Summary

Problems solved by technology

Due to external environment changes, node energy and channel bandwidth limitations, and network node joining, exiting or moving, etc., the topology of wireless sensor networks often changes frequently.

Due to the distributed method, network nodes cannot effectively obtain information on the location, remaining energy, sensing range, and transmission power of nodes in the entire network. A single node can only perform local network control based on information about itself and its adjacent nodes. Therefore, the performance of the network cannot reach the global optimum

Moreover, when an emergency occurs on the network, due to the lack of a centralized management and control center, network resources cannot be effectively delivered to the emergency area in real time, and there is a certain lag in the adjustment of network routing.

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