Method for quick multi-wireless module switching

Abstract

The invention discloses a method for quick multi-wireless module switching, which comprises the following steps that: an independent primary wireless module undertakes a foreground wireless transmission task and an independent secondary wireless module undertakes a background scanning task at the same time to realize the synchronous operation of foreground wireless transmission and background scanning; when the secondary wireless module finds a new target AP with higher signal quality, the target AP is switched to for forming a secondary link; when the transmission performance of the secondary link is advantageous over that of a primary link, the primary and secondary priorities of the two links is switched; a two-layer routing is updated according to the switched links; and the previous processes is circularly executed. The method has the advantages of realizing real network seamless switching due to the fact that the secondary link is already superior to the primary link during the execution of primary / secondary link switching and allowing a product which is based on the method to keep continuous network connection unlike the prior station active switch method and the prior IAPP method both of which are incapable of realizing vehicle-mounted fast moving application and cause obvious network interruption during the execution of inter-AP switching in a running process of a vehicle.

Description

【Technical field】 [0001] The invention relates to a method for accessing wireless broadband of a traffic main line in a wireless network, in particular to a method for fast switching of multiple wireless modules. 【Background technique】 [0002] Fast switching is one of the key technical problems encountered in wireless broadband access on traffic trunk lines. The switching time between APs (Access Points, wireless access points) of traditional WiFi (Wireless Fidelity, Wireless Fidelity) is within 1-2 seconds, which cannot meet the rapid mobile application of traffic arteries. On the expressway, the fastest driving speed of a car reaches 120km / h, while my country's current high-speed railway has reached more than 200km / h, which is close to 40m / s. Due to the limited coverage distance of WiFi, even if a directional antenna is used for directional coverage along the road, in order to ensure a better access effect, the coverage distance is generally within 1 km. At the switchin...

AI Technical Summary

Problems solved by technology

[0004] In addition to hundreds of milliseconds of switching delay, the 802.11 site active switching method also has the following three defects: 1) All APs must belong to the same ESS, that is, they must be configured with the same ESSID (ESS identification number) ; And as long as the AP is configured with the same ESSID, the AP becomes the access target of the STA; 2) Before performing AP handover, its transmission performance has deteriorated sharply; 3) After performing AP handover, the optimization of its transmission performance is also a slow process the process of

[0005] For the IAPP method, since the STA has only one wireless module, it has the following two defects: 1) the background scanning process will interrupt the wireless transmission process of the foreground for hundreds of milliseconds; Optimization is still a slow process

Cannot find new target APs without background scanning

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