Multi-cast method and multi-cast system and multi-cast device

Abstract

The invention discloses a multicast method, which includes the steps as follows: distribute intragroup keys and multicast group labels to all multicast groups; a sending end receives a multicast frame from the outside, the multicast group which the multicast frame belongs to is determined, the multicast frame is encrypted by using the intragroup key corresponding to the multicast group, and the encrypted multicast frame is sent to a receiving end; the receiving end identifies the multicast group which the multicast frame belongs to according to the multicast group labels, and decrypts the received multicast frame by using the intragroup key corresponding to the multicast group. The invention discloses a multicast system, multicast equipment, another multicast method and aother multicast equipment. The technical proposal of the invention improves the multicast security and reduces the system burden.

Description

technical field [0001] The invention relates to data transmission technology in wireless communication, in particular to a multicast method, a multicast system and a multicast device. Background technique [0002] Multicast is a data transmission method between unicast and broadcast, that is, the destination address of the data frame is a multicast address, and the sender only transmits the data frame to multiple receivers belonging to the multicast group. end. In wireless communication, the difference between multicast and unicast is that multicast only sends a copy of the data; the difference from broadcast is that multicast traffic is only received and processed by listening devices that are members of the multicast group. For this one-to-many data transmission, multicast is more efficient than unicast and broadcast. [0003] There are two types of multicast transmission modes in existing wireless local area networks: transmitting multicast frames in a broadcast mode an...

AI Technical Summary

Problems solved by technology

[0005] However, when using the above-mentioned broadcast and unicast methods to transmit multicast frames, there are the following problems: After receiving the data frames, all STAs in the BSS domain where the STA is located treat the multicast address and the broadcast address equally without filtering, and use the BSS After the GTK in the domain is decrypted, it is directly distributed to the upper layer

In this way, the burden of STAs that do not belong to the multicast group corresponding to the multicast frame is increased, and since STAs that do not belong to the multicast group also have the same GTK in the BSS domain, they can decrypt it, so the security of multicast poor

[0006] Moreover, when the multicast frame is transmitted in unicast mode, the AP also needs to copy the multicast frame into multiples and send it to each STA separately, which increases the burden on the system

[0007] It can be seen that the existing multicast technology cannot effectively guarantee the security of multicast, and when transmitting multicast frames, it adds unnecessary burden to the system

Images