A vertical handover decision method for heterogeneous networks based on 4G and DSRC technology

Abstract

The invention discloses a 4G-and-DSRC-technology-based vertical handover decision-making method of a heterogeneous network. A decision tree is formed by using four parameters to carry out decision making of heterogeneous network handover; and the algorithm complexity is low. The four parameters are parsed rapidly from a parameter file of a base station or a message packet of a roadside node, so that the decision making speed is increased and the calculation becomes simple. With full consideration of the radiation radius of a DSRC network signal, multi-step decision making is carried out on heterogeneous network handover of a vehicle-mounted unit in a ping-pong effect and then two parameters of a relative driving direction D and a signal intensity difference delta d of the vehicle-mounted unit and the roadside node are introduced, so that the decision making speed is increased and the ping-pong effect during the handover process is avoided. According to the invention, on the basis of multi-factor consideration, connecting time of a vehicle-mounted unit with a DSRC port of a roadside node is prolonged and thus the time of access to a DSRC network is prolonged.

Description

technical field [0001] The invention belongs to the communication field in the Internet of Vehicles, and in particular relates to a heterogeneous network vertical handover judgment method based on 4G and DSRC technology. Background technique [0002] In the Internet of Vehicles environment, in order to realize the communication between the vehicle and the road, that is, the communication between the vehicle unit and the roadside node, it must be connected to the mobile communication network with the LTE (Long Term Evolution) protocol as the standard—4G network and use DSRC (Dedicated Short Range Communications) is a dedicated short-range communication network—DSRC network. Due to the limited deployment of drive test nodes, the coverage of the dedicated short-range communication network is small. Therefore, when the coverage of the communication network is exceeded, it is necessary to switch to the mobile communication network to maintain the connection between the vehicle un...

AI Technical Summary

Problems solved by technology

[0003] Although the vertical handoff algorithm based on received signal strength has low complexity and is easy to implement, it has few factors to consider and low effectiveness, so it is not suitable for heterogeneous wireless networks.

Algorithms based on fuzzy logic and neural networks are very effective, but the implementation is complex and requires further improvement and optimization

In comparison, the algorithm based on the cost function has lower complexity but high effectiveness, so it is preferred by users

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