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In this work, we propose an approach to deploy and manage resources in a surveillance system, based on cellular technologies. In such a system, on one hand, the data from CCTV cameras should be reliably delivered with as higher quality as possible within several seconds after they were generated to enable near real-time surveillance. On the other hand, the Web traffic, which is generated in public...
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 HCCA TXOP Negotiation mechanism, which allows APs to agree...
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 reservation is done in a periodic manner — the reserved...
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 todays Wi-Fi is inefficient in terms of these challenges,...
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 hundred milliseconds, making packets staying in the same...
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 routing protocols, which imposes constraints on link quality,...
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 decision-making process of link management in IEEE...
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