Group temporal?key updating method, related devices and system

Abstract

The embodiment of the invention discloses a group temporal?key updating method, related devices and a system which are used for realizing the update of a group temporal?key (GTK) in a basic service set (BSS) with extra load of an access point being not increased. The group temporal?key updating method of the embodiment of the invention includes the following steps that: the access point (AP) sets an update cycle of the group temporal?key (GTK); when the update cycle of the group temporal?key (GTK) achieves, the access point (AP) upgrades the group temporal?key (GTK); the access point (AP) receives a group temporal?key (GTK) request which is transmitted by a mobile station (STA) in an association table in a preset delay duration after the update cycle of the group temporal?key (GTK) achieves, all mobile stations which communicate with the access point are recorded in the association table, and the preset delay duration is smaller than the update cycle of the group temporal?key (GTK); and after the update cycle of the group temporal?key (GTK) achieves, the access point (AP) transmits an updated group temporal?key (GTK) to the mobile station in the association table according to the group temporal?key (GTK) request when the preset delay duration achieves.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a method for updating a group key and a related device and system. Background technique [0002] Wireless Fidelity (WiFi) technology will be popularized and applied in the field of Intelligent Transport System (ITS). The European Telecommunications Standards Institute (ETSI) stated that it will use the Institute of Electrical and Electronics Engineers (IEEE) 802.11p as the communication standard for intelligent transportation. [0003] With the increasing number of WiFi hotspots (Access Point, AP), many cities will achieve full coverage of WiFi networks, and install WiFi transceiver modules (equivalent to mobile stations (STA, Station)) on vehicles such as vehicles for receiving For real-time road condition information in the WiFi network, WiFi network operators will charge certain fees to driving users as network deployment costs and network maintenance fees. Use...

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Problems solved by technology

[0007] The inventors of the present invention found in the process of implementing the present invention that in the prior art, in a WiFi network composed of one AP and several STAs, if any STA leaves, the AP must update the GTK in time, and such a GTK update mechanism is only applicable In the situation where the STA location is relatively fixed, however, on a road section with heavy traffic, a large number of cars loaded with STAs will leave one AP every second and enter the coverage of another AP. An AP can communicate with up to 2007 STAs. Association, if multiple STAs leave every second within the coverage of the AP, the AP needs to update the GTK in time when each STA leaves. At this time, if the AP updates the GTK in time when each STA leaves, the AP can only Busy with updating GTK, but unable to provide other services for STA

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