How to stream multicast videos with high data rates over wireless?
Multicast traffic including multicast videos are by default sent at low transmit rates. This may not be sufficient for stream videos. This article explains how to transmit multicast videos with high data rates over the wireless network.
Starting 188.8.131.52, the option "multicast-rate" has been introduced in the SSID profile. Post 184.108.40.206 and Pre 220.127.116.11 versions allowed configuring the tx rates for multicast videos, but only upto 54 Mbps.
Starting 18.104.22.168, Modulation Coding Scheme (MCS) rates for video multicast can be set in the SSID profile that allows configuring MCS 0 - 15.
The maximum data rate on MCS 15 is 130 Mbps with Long Guard Interval and 144.4 Mbps with Short Guard Interval.
Below are the commands to configure mcs rates on the SSID Profile.
(Rajaguru-22.214.171.124) (config) #wlan ssid-profile INFINITE-PSK-2 (Rajaguru-126.96.36.199) (SSID Profile "INFINITE-PSK-2") #multicast-rate ? 12 12 Mbps 18 18 Mbps 24 24 Mbps 36 36 Mbps 48 48 Mbps 54 54 Mbps 6 6 Mbps 9 9 Mbps default default (lowest configured rate) mcs0 6.5 Mbps mcs1 13 Mbps mcs10 39 Mbps mcs11 52 Mbps mcs12 78 Mbps mcs13 104 Mbps mcs14 117 Mbps mcs15 130 Mbps mcs2 19.5 Mbps mcs3 26 Mbps mcs4 39 Mbps mcs5 52 Mbps mcs6 58.5 Mbps mcs7 65 Mbps mcs8 13 Mbps mcs9 26 Mbps (Rajaguru-188.8.131.52) (SSID Profile "INFINITE-PSK-2") #multicast-rate mcs15 (Rajaguru-184.108.40.206) (SSID Profile "INFINITE-PSK-2") #end (Rajaguru-220.127.116.11) #write memory Saving Configuration... Configuration Saved. (Rajaguru-18.104.22.168) #
The best way to verify that the multicast video is transmitted at mcs 15 is from a wireless packet capture. Below is are the screenshots that shows the data rate of the multicast packet with MCS 6 (default) and MCS 15.