Abstract
Being of high importance, real-time applications, such as online gaming, real-time video streaming, virtual reality, and remote-control drone and robots, introduce many challenges to the developers of wireless networks. Such applications pose strict requirements on the delay and packet loss ratio, and it is hardly possible to satisfy them in Wi-Fi networks that use random channel access. The article presents a novel approach to enable real-time communications by exploiting an additional radio. This approach was recently proposed by us in the IEEE 802.11 Working Group and attracted much attention. To evaluate its gain and to study how real-time traffic coexists with the usual one, a mathematical model is designed. The numerical results show that the proposed approach allows decreasing the losses and delays for the real-time traffic by orders of magnitude, while the throughput for the usual traffic is reduced insignificantly in comparison to existing networks.
Highlights
Many applications that can be classified as real-time applications (RTAs) have been gaining momentum during the recent years
Another disadvantage of using an independent box in the network is that the interfaces have separate medium access control (MAC) queues and cannot track successful deliveries made by each other, which leads to unnecessary transmissions, increased channel occupancy and the time that the frames spend in the transmitter’s queue, and leads to packet losses
RTAs present a significant challenge for the new generation of Wi-Fi networks since they impose strict requirements on latency and reliability
Summary
Many applications that can be classified as real-time applications (RTAs) have been gaining momentum during the recent years. On the other hand, processing of the packet at the redundancy box introduces an additional delay which grows with the packet length Another disadvantage of using an independent box in the network is that the interfaces have separate medium access control (MAC) queues and cannot track successful deliveries made by each other, which leads to unnecessary transmissions, increased channel occupancy and the time that the frames spend in the transmitter’s queue, and leads to packet losses. We consider that an RTA STA can be in a state when it has an empty transmission queue and that it can transmit its frame without the backoff countdown if the frame is generated when the channel is idle.
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