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Reference Broadcast Infrastructure Synchronization
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<p>The Reference Broadcast Infrastructure Synchronization (RBIS) protocol is a <a href="/facts/Master%2fslave_(technology)/8APze020">master/slave</a> synchronization protocol. RBIS, as the <a href="/facts/Reference_Broadcast_Time_Synchronization/1WYPjTpn">Reference Broadcast Time Synchronization</a> (RBS), is a receiver/receiver synchronization protocol, as a consequence timestamps used for clock regulation are acquired only on the receiving of synchronization events. RBIS is specifically tailored to be used in <a href="/facts/IEEE_802.11/ryEGu6Vq">IEEE 802.11</a> Wi-Fi networks configured in infrastructure mode. Such a kind of networks are based on an access point that coordinates the communication between the wireless nodes (i.e., the STAs), and they are very common. </p><p>The advantages of RBIS are that it can be directly used with common access points, no modification is required to the STAs (or minor modifications to improve synchronization performance) and a very small overhead is added to the wireless channel (typically a message every 1 second). Moreover, it allows an easily synchronization with an external time source, because it is a master/slave protocol. Its major drawback is that it does not compensate the propagation delay. This fact limits the achievable synchronization quality to a couple of microsecond, which is typically enough for the very majority of the applications, especially for <a href="/facts/Home_automation/kfz6C07m">home automation</a>. An example is the connection of wireless speakers to a television. </p>