A group key update method and related device and system

Abstract

The embodiment of the invention discloses a method for updating a group key, a related device and a system, which are used to update GTK in a BSS without increasing the extra load of an access point. One of the methods provided by the embodiment of the present invention includes: the access point AP sets the update period of the group key GTK; whenever the update period of the GTK arrives, the access point updates the GTK; the access point receiving the GTK request sent by the mobile station STA in the association table within a preset delay period after the GTK update period arrives, the association table records all mobile stations communicating with the access point, the The preset delay period is shorter than the GTK update period; when the preset delay period arrives after the GTK update period arrives, the access point sends an update to the mobile station in the association table according to the GTK request After GTK.

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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