Fuzzy Vertical Handover Method Based on Sojourn Time Prediction in Vehicle Heterogeneous Networks

A technology of residence time and heterogeneous network, applied in the field of vertical handover, it can solve the problems such as the inability to effectively improve the quality of service, the inability to describe the randomness of parameters well, and the lack of terminal movement rules.

CN107613532BActive Publication Date: 2020-09-29CHONGQING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-09-29

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Abstract

The invention requests for protecting a type-II fuzzy vertical handoff method based on sojourn time prediction in a vehicle heterogeneous network. In the vehicle heterogeneous network, aiming at the problem that the handoff performance is reduced due to the facts that the sojourn time of a vehicle terminal is too short and the fuzziness and the randomness simultaneously exist in judgment parameters, influence of the sojourn time on the handoff performance is considered. When handoff judgement is carried out, the sojourn time of the terminal in various candidate networks is predicted at first;then, a corresponding type-II subordinating degree function is designed according to fuzziness and randomness factors in the sojourn time, the available bandwidth and the user access fee; furthermore,a type-II fuzzy inference system is constructed; and finally, an optimal handoff network is selected according to the system output. Experimental results show that: due to the fuzzy vertical handoffmethod disclosed by the invention, the average handoff time, the handoff failure rate and the ping-pong handoff time can be effectively reduced; and the system throughput is improved.
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Description

technical field

[0001] The invention belongs to a vertical switching method in a vehicle heterogeneous wireless network and belongs to the field of mobile communication. In particular, it concerns a method for vertical switching using dwell time prediction and type-2 fuzzy reasoning. Background technique

[0002] With the development of intelligent transportation systems and the integration of heterogeneous wireless network technologies, high-speed mobile vehicle terminals are increasingly dependent on the network, and vehicle users hope to obtain the best network services anytime, anywhere, including stronger stability , higher bandwidth and lower costs, etc. In the vehicle heterogeneous wireless network, the vertical handover technology is the key technology to meet the user's network requirements. However, due to the high-speed mobility of vehicle terminals and the complexity and diversity of network environments, how to ensure the efficiency and stability of vehicle te...

Examples

Embodiment Construction

[0047] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0048] The technical scheme that the present invention solves the problems of the technologies described above is:

[0049] The method of the present invention comprehensively considers the impact of the stay time of the vehicle terminal in the candidate network on the handover performance and the characteristics of uncertainties such as ambiguity and randomness in the judgment parameters, and can effectively reduce the average number of handovers, handover failure rate and ping-pong Switching times, improve system throughput.

[0050] The vertical switching method that the present invention proposes comprises the following steps:

[0051] Step 1. According to the fuzziness and randomness of the decision...