Abstract
An important problem of modern Wi-Fis is the interferences caused by hidden stations active in the same area, or in multihop communications. All these issues significantly degrade the efficiency of the random channel access methods. Recent standardization and research activities are focused on solving coordination problems between various Wi-Fi devices. For example, the ongoing development of Wi-Fi 7 includes a coordinated schedule between the access points as a candidate solution. Consequently, Wi-Fi has many deterministic channel access mechanisms, which schedule channel time in a periodic manner well in advance and, thus, are utilized for streaming QoS sensitive data. However, both random traffic intensity and error-prone nature of the wireless channel complicate choosing such reservation parameters, i.e., the duration and the period of the reserved time intervals, that satisfy QoS requirements while minimizing channel time consumption. This paper introduces a general mathematical framework to solve the problem of choosing appropriate reservations parameters. The comparison of the analytical and simulation results show the high accuracy of the proposed framework. Finally, the paper gives an example of how to use the developed framework to maximize the network capacity.
Highlights
Communication technologies are continuously evolving at a fast pace
While the benefits of various channel reservation mechanisms have been studied in detail in the literature, this paper provides a detailed description of a mathematical framework to model data streaming with periodic reservations in Wi-Fi networks
That is why we develop another approach that significantly reduces the complexity of the analytical model
Summary
Communication technologies are continuously evolving at a fast pace. While users enjoy mobile Internet access anytime and anywhere, system designers are anxious about the exponentially increasing number of wireless devices, most of which are battery supplied, and the exponential growth of traffic volume. IEEE 802.11aa (ROBUST AUDIO AND VIDEO)—HCCA TXOP NEGOTIATION The HCCA (Hybrid coordination function Controlled Channel Access) TXOP Negotiation is another mechanism that uses periodic reservations It is introduced in the 11aa amendment, which improves real-time audio/video streaming by extending basic 11e functionality. Because of the high density of APs, overlapping networks have become a typical scenario considered in many recent Wi-Fi amendments In those cases, two neighboring APs may erroneously allocate the same time intervals to STAs transmissions, which may result in collisions. The controller calculates how much channel time the AP needs to stream a particular video flow and which reservation parameters and which transmission method can be used It sends these results to APs. In this paper, we develop a model that can be used by the controller to select appropriate reservation parameters and a transmission method.
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