An SDN-based WLAN system deployed in different channels and its seamless switching method

Abstract

The invention discloses an SDN-based different channel deployment WLAN system and a seamless switching method thereof. The WLAN system comprises one or more physical access points (AP) and a controller, wherein each physical access point can work in different channels and bear multiple virtual APs; each user terminal corresponds to one virtual AP; the physical APs can monitor user terminal signals on different channels when transmitting signals on specific channels and upload the monitored signals to the controller in real time; the controller carries out switching decision on strength of the signals uploaded by the physical APs, if switching is required, an instruction is given out to enable the user terminals to switch to the channels of the target physical access points and meanwhile, the virtual APs are switched to the target APs.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an SDN-based WLAN system for deploying different channels and a seamless switching method thereof. Background technique [0002] With the development of smart terminals and wireless services, users have higher demands on the bandwidth and quality of wireless access, and 802.11-based wireless local area networks (WLANs) are also more widely used. However, as the deployment of WLAN networks becomes denser, users switch between different access points more frequently. Frequent switching will have a serious impact on network QoS indicators, such as increasing delay and packet loss rate. However, wireless local area networks are not designed for mobility. Traditional WLAN networks do not have a seamless switching mechanism. Therefore, many services such as VoIP, real-time audio and video services, etc. are not very effective under WLAN networks, especially when users...

AI Technical Summary

Problems solved by technology

Therefore, seamless handover between access nodes can be realized. However, in order to realize this wireless handover technology, different access points need to use the same channel for deployment. Since the 802.11-based WLAN network uses CSMA / CA for channel If used, co-channel deployment will greatly reduce the overall capacity of the WLAN network, resulting in a decrease in the connection rate of users in the overlapping area.

Images