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Modeling Joint Usage of Random and Deterministic Channel Access in Wi-Fi Networks
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The ability to provide Quality of Service in Wi-Fi networks to a considerable degree depends on a used channel access method. A number of access methods allow a Wi-Fi station to preliminarily reserve a set of time intervals inside which transmissions are protected from interference. However, fixed parameters assigned to such reservations make them not so flexible as needed for serving Variable Bit Rate (VBR) traffic. On the contrary, random channel access mandatory for Wi-Fi provides such flexibility though at cost of reliability because of collisions and interference. In order to achieve both the reliability and flexibility, we propose a joint access method based on both reservations and random access. In this pioneering work, we study a VBR flow transmission process with the joint method and build its mathematical model. The model can be used to find appropriate parameters of the method which guarantee that QoS requirements of the flow are satisfied while the amount of used channel time is kept as low as possible.
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Makhmudov T. N., Захарова В. О., Салуев Е. А. et al., Динамика сложных систем - XXI век 2023 Т. 17 № 1 С. 13–29
Постановка проблемы. Во все времена информация являлась востребованным ресурсом. Злоумышленники, захватывая данные, в некоторых случаях могли существенно влиять не только на отдельные объекты и процессы, но и на развитие социума. Современный мир нельзя представить без беспроводных способов связи. Множество электронных устройств передают данные между собой с помощью различных протоколов, и, к сожалению, эти протоколы не ...
Added: December 27, 2025
Kureev A., Пойда А. И., Глинский К. А. et al., В кн.: ИТиС 2023: Сборник трудов 47-й междисциплинарной школы-конференции ИППИ РАН "Информационные технологии и системы 2023"Т. 47.: М.: ИППИ РАН, 2023. С. 518–519.
Реконфигурируемые интеллектуальные поверхности ( англ. Reconfigurable Intelligent Surface, RIS) представляют собой технологию, улучшающую пропускную способность в беспроводных сетях за счет управления фазой и амплитудой отраженных сигналов. Обычно RIS настраиваются при помощи информации о канале, переданной от мобильных станций (англ. Mobile Station, MS) к базовым станциям (англ. Base Station, BS) что усложняет их внедрение в существующих ...
Added: January 17, 2024
E. Khorov, A. Krasilov, M. Susloparov et al., IEEE Communications Surveys and Tutorials 2023 Vol. 25 No. 4 P. 2862–2891
Emerging wireless systems target to provide multi-Gbps data rates for each user, which can be achieved by utilizing ultra-wide channels available at mmWave, terahertz, and lightwave frequencies. In contrast to the traditional spectrum below 6 GHz, these high-frequency bands raise many issues, complicating their usage. For example, because of high signal attenuation and blockage by ...
Added: December 23, 2022
Korolev G., Kureev A., Khorov E. et al., , in: 2020 International Conference Engineering and Telecommunication (En&T).: IEEE, 2020. P. 1–5.
© 2020 IEEE.Non-orthogonal multiple access (NOMA) is a key technology for future wireless systems. Keeping the number of antennas on the devices unchanged, NOMA increases the spectral efficiency of the wireless system and raises the aggregated system throughput. For this reason, NOMA is a very attractive technology for implementation in future Wi-Fi standards that will ...
Added: October 26, 2022
Korolev G., Kureev A., Khorov E. et al., , in: 2021 International Conference Engineering and Telecommunication (En&T).: IEEE, 2022. P. 1–5.
© 2021 IEEE.Non-Orthogonal Multiple Access (NOMA) is a promising technology for future Wi-Fi, In uplink NOMA, stations with different channel conditions transmit simultaneously at the same frequency by splitting the signal by power level. Since Wi-Fi uses random access, the implementation of uplink NOMA in Wi-Fi faces many challenges. The paper presents a data transmission ...
Added: October 26, 2022
A Phase Noise Resistant Constellation Rotation Method and Its Experimental Validation for NOMA Wi-Fi
Khorov E., Kureev A., Ilya Levitsky et al., IEEE Journal on Selected Areas in Communications 2022 Vol. 40 No. 4 P. 1346–1354
Non-orthogonal multiple access (NOMA) is a well-accepted technology for future Wi-Fi systems to improve spectral efficiency. NOMA allows an access point (AP) to simultaneously serve multiple devices by splitting the transmit power between them. Using the superposition coding the AP combines signals of different frames with predefined power weights. However, as it is already known, ...
Added: October 26, 2022
Molodtsov V., Kureev A., Khorov E., IEEE Access 2021 Vol. 9 P. 153767–153774
Nowadays, the Direction of Arrival (DoA) estimation problem attracts much attention because of emerging use cases for wireless networks. DoA is beneficial for Reconfigurable IntelligentSurfaces, indoor localization, and various navigation and sensing applications, such as gesture recognition and home monitoring. The Multiple Signal Classification (MUSIC) algorithm is very promising for DoAestimation because it provides better ...
Added: December 29, 2021
Loginov V., Троегубов А. Ю., Lyakhov A. et al., IEEE Access 2021 P. 146137–146152
To improve the capacity of cellular systems without additional expenses on licensed frequency bands, the 3GPP consortium has designed cellular technologies that use the unlicensed spectrum. The important peculiarity of the usage models of these technologies, the latest of which is New Radio Unlicensed (NR-U), is the coexistence with Wi-Fi networks deployed in the same ...
Added: October 31, 2021
Tutelian S., Bankov D., Shmelkin D. et al., Sensors 2021 Vol. 21 No. 18 Article 6099
This paper studies the usage of orthogonal frequency division multiple access (OFDMA) for uplink transmissions in IEEE 802.11ax networks. OFDMA enables simultaneous multi-user transmissions in Wi-Fi, but its usage requires efficient resource allocation algorithms. These algorithms should be able to adapt to the changing channel conditions, including the frequency-selective fading. This paper presents an OFDMA ...
Added: October 12, 2021
Zhdanovskiy V., Loginov V., Lyakhov A., Journal of Communications Technology and Electronics 2021 Vol. 66 No. 6 P. 784–795
New Radio-Unlicensed (NR-U) is a technology that allows fifth generation mobile networks to utilize unlicensed frequency bands, in particular, the 5 GHz band. To increase throughput, an NR-U base station (gNB) can simultaneously operate in several frequency channels within the 5 GHz band. However, the gNB cannot always transmit data through one channel and, at ...
Added: October 11, 2021
Loginov V., Khorov E., Lyakhov A. et al., IEEE Transactions on Mobile Computing 2022 Vol. 21 No. 9 P. 3138–3149
To achieve higher throughputs in cellular networks, 3GPP proposes to use unlicensed frequency bands and develops technologies - the latest one is NR-U - allowing a cellular base station to transmit in unlicensed bands, which are already occupied by Wi-Fi networks. To enable fair channel sharing between two technologies, the base station uses a sort ...
Added: March 1, 2021
Stepanova E., Bankov D., Khorov E. et al., IEEE Access 2020 Vol. 8 P. 221061–221076
Energy efficiency is a significant challenge for modern wireless networking devices. It is crucial for the Internet of Things devices, is required for battery-supplied user devices such as smartphones, and is advisable for high-performance devices such as wireless VR headsets. This article examines the ability of modern Wi-Fi devices to achieve extremely low power consumption ...
Added: December 18, 2020
Тутельян С. А., Khorov E., , in: 2018 International Scientific and Technical Conference Modern Computer Network Technologies (MoNeTeC).: IEEE, 2018. P. 1–6.
Non-orthogonal multiple access (NOMA) is a radio access technology that allows significantly improving network performance in scenarios with high heterogeneity. While being typically studied for cellular networks, NOMA can also be used in Wi-Fi networks. This paper proposes a scheduling approach for NOMA-aware resource scheduling in Wi-Fi. This approach is implemented to design NOMA-aware downlink ...
Added: November 27, 2020