Anton Kiryanov

The Institute for Information Transmission Problems · Network Protocol Research Lab

In the modern world, the Wi-Fi technology is undoubtedly one of the leaders in the field of wireless communications. Increasing density of devices in Wi-Fi networks and increasing number of the networks themselves have led to high interference and, as a result, to a decrease in the performance of Wi-Fi networks. One effective solution to reduce int...

To improve the performance of Wi-Fi networks in dense deployments, the recent IEEE 802.11ax standard introduces a palette of features improving spatial reuse. A key property of these features is dynamic changes in transmit power and the interference from the neighboring devices. The paper explains the basic operation of spatial reuse features and s...

During the last decade, the number of devices connected to the Internet by Wi-Fi has grown significantly. A high density of both the client devices and the hot spots posed new challenges related to providing the desired quality of service in the current and emerging scenarios. To cope with the negative effects caused by network densification, moder...

Ubiquitous densification of wireless networks has brought up the issue of inter-and intra-cell interference. Interference significantly degrades network throughput and leads to unfair channel resource usage, especially in Wi-Fi networks, where even a low interfering signal from a hidden station may cause collisions or block channel access as it is...

While celebrating the 21st year since the very first IEEE 802.11 “legacy” 2 Mbit/s wireless Local Area Network standard, the latest Wi-Fi newborn is today reaching the finish line, topping the remarkable speed of 10 Gbit/s. IEEE 802.11ax was launched in May 2014 with the goal of enhancing throughput-per-area in high-density scenarios. The first 802...

In this paper, we study a class of algorithms for decentralized dynamic resource reservation in Wi-Fi networks in which each station chooses and reserves time intervals for future transmission. To avoid interference, information on reserved time intervals is regularly sent to neighboring stations. To minimize the amount of transmitted control infor...

It is well known that in case of high density deployments, Wi-Fi networks suffer from serious performance impairments due to hidden and exposed nodes. The problem is explicitly considered by the IEEE 802.11ax developers in order to improve spectrum efficiency. In this paper, we propose and evaluate the joint usage of dynamic sensitivity control (DS...

To satisfy QoS requirements for multimedia flows transmitted over WLANs, deterministic channel access mechanisms can be used. A number of them use channel reservation, i.e. they allow the stations to reserve channel times in advance for future packets. To minimize protocol overhead and simplify the description of the reserved channel times, a reser...

To avoid collisions in Wi-Fi networks, access points (APs) --- acting as coordinators --- got the ability to use centralized contention-free channel access, e.g. HCCA, which supports parameterized QoS. However, the growth of WLANs population raises a problem of coordination between APs. As a solution to this problem, IEEE 802.11aa introduces the HC...

Link management mechanisms (LMMs) are responsible for the formation of the logical topology of networks by opening and closing links between stations and are an integral part of most of proactive routing protocols. In this work, a class of LMMs is analyzed in which the decision on opening and closing links is made on the basis of a sequence of rece...

On the transmission of several streams to different recipients over a wireless network in the case of degradation of the link quality with any of them, the head-of-line-blocking problem arises. This problem is especially important in the case of streaming with strict requirements to the quality of service. One of promising solution of this problem...

Wi-Fi was designed just to replace wired Internet connection, but it has changed the Internet as a whole. Wireless devices generate the largest percentage of the Internet traffic and the Wi-Fi market is continuously raising, which brings new challenges connected with more devices, more data, and higher Quality of Experience expectations. Since toda...

To provide Quality of service (QoS) in wireless networks, deterministic channel access is often used. The key idea of the method is to provide a prerogative to a station to access the channel during allocated time intervals called reservations. The existed protocol standards define how to set up a reservation but do not describe how many reservatio...

In the paper, we address the influence of Head-of-line (HOL) blocking on real-time video streaming in wireless networks. We consider short channel failures when the probability of successful packet transmission to a station abruptly drops to a near zero value. In wireless networks, the duration of such channel failure intervals may reach some hundr...

In the paper, we consider real-time video streaming over an IEEE 802.11 network in the presence of short-term channel failures. The failures can dramatically decrease the received video quality at all network stations, even if the channel fails for one station only. In order to assist real-time video traffic to overcome short-term channel failures...

The paper is devoted to the groupcast routing of real-time multimedia streams with restrictions on the packet delivery time and packet loss ratio in MANET networks. The developed algorithms and their implementation in the framework of Proximity aware Groupcast in MANET (GiM) protocol, with the support of a special operating mode (proximity aware mo...

In mobile ad-hoc networks (MANETs), neighborhood discovery and link management (NDLM) mechanism is used by each node to determine the set of its neighbors, or in other words, to establish one-hop links. Values of this mechanism parameters dramatically affect network performance, especially when real-time traffic is transmitted with proactive routin...

Efficient link management is important for mesh networking. The links opened between neighbor STAs should be stable and ensure high probability of packet delivery. Various approaches of link management are usually compared by simulation. The core contribution of this paper is original link management efficiency criteria and an analytical model of d...