Method, device and system for multicast service transmission control in wireless local area network system

Abstract

The invention provides a method, device and system for multicast service transmission control in a wireless local area network system, wherein the wireless local area network system comprises a wireless local area network controller and a plurality of wireless local area network access points which are controlled by the wireless local area network controller, the wireless local area network controller configures the multicast service control of the wireless local area network access points, and the wireless local area network access points inquire and receive multicast Ethernet data frames according to the configuration in a local Ethernet data frame mode, convert the received multicast Ethernet data frames into data frame formats which are suitable for being received by a wireless local area network client side, and send the data frame formats. According to the method, the device and the system, network bandwidth resources can be effectively saved and the configuration cost of a wireless local area network can be saved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for controlling multicast service transmission under a WLAN (Wireless Local Area Network, wireless local area network) system. Background technique [0002] As a network combining wired network and wireless communication, WLAN brings great convenience to mobile users. In the application of WLAN technology, the WLAN network architecture is divided into two types, one is the traditional FAT AP (fat access point ) network architecture, one is a centralized FIT AP (thin access point) network architecture, which is controlled by an AC (wireless LAN controller) through a wired network to centrally control the downlink AP (hereinafter referred to as WTP), and the AP is created by joining the AC AP groups are associated with ACs, and WLAN clients communicate with the network by connecting to APs. [0003] In a centralized WLAN network, the AC can contr...

AI Technical Summary

Problems solved by technology

However, this solution still has the following deficiencies: 1. Corresponding to a public multicast address, a corresponding CAPWAP multicast address needs to be configured for AC and WTP, and WTP needs to join this specific CAPWAP multicast group; 2. A multicast data stream From the AC to the WTP must be encapsulated in the specified CAPWAP multicast header, that is, the IP in IP mode (the CAPWAP header and the newly added CAPWAP multicast header need to be further encapsulated outside the original multicast packet), which increases the extra overhead. 3. Since all WTPs are on this multicast tree, even if there is no user under a certain WTP, the multicast stream will be transmitted to the WTP along the CAPWAP multicast tunnel, which wastes bandwidth resources; 4. In the user In the network, if there are other types of network terminals under the WTP that want to receive the same multicast stream, there will be two copies of the multicast stream between the same WTP and the access device DSLAM (Digital Subscriber Line Multiplexer) Simultaneously transmitted on the physical data link, one is the CAPWAP multicast flow transmitted by the CAPWAP communication tunnel, and the other is the original multicast flow not transmitted in the CAPWAP communication tunnel. Further, if the physical location of the AC and the DSLAM are different, in the access network There will also be corresponding resource duplication in the system

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