Joint Use of Guard Capacity and Multiconnectivity for Improved Session Continuity in Millimeter-Wave 5G NR Systems

Begishev, Vyacheslav; Sopin, Eduard; Moltchanov, Dmitri; Kovalchukov, Roman; Samuylov, Andrey; Andreev, Sergey; Koucheryavy, Yevgeni; Samouylov, Konstantin

doi:10.1109/tvt.2021.3061906

Cited by 19 publications

(35 citation statements)

References 29 publications

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“…Due to the limited space of the paper, we have not discussed examples of these highly interesting applications here. The reader is referred to articles [21][22][23], recently published in the IEEE series of journals, where one can find descriptions of system models, formulations of mathematical problems, methods for their analysis and numerical estimates of the metrics under study. Now, we subtract from the left-hand and right-hand sides of (A2) the respective sides of (4) multiplied by Q(E), which yields…”

Section: Discussionmentioning

confidence: 99%

“…Numerous references to papers in this area can be found in [18][19][20]. Systems with random multi-resource requirements are widely used in the analysis of modern wireless communication systems [20][21][22][23]. In [24] the service process of loss systems with random resource requirements is represented by means of a list of random length consisting of generally distributed random vectors of the quantities of occupied resources.…”

Section: Introductionmentioning

confidence: 99%

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Resource System with Losses in a Random Environment

Naumov¹,

Samouylov

2021

Mathematics

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The article deals with queueing systems with random resource requirements modeled as bivariate Markov jump processes. One of the process components describes the service system with limited resources. Another component represents a random environment that submits multi-class requests for resources to the service system. If the resource request is lost, then the state of the service system does not change. The change in the state of the environment interacting with the service system depends on whether the resource request has been lost. Thus, unlike in known models, the service system provides feedback to the environment in response to resource requests. By analyzing the properties of the system of integral equations for the stationary distribution of the corresponding random process, we obtain the conditions for the stationary distribution to have a product form. These conditions are expressed in the form of three systems of nonlinear equations. Several special cases are explained in detail.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resource System with Losses in a Random Environment

Naumov¹,

Samouylov

2021

Mathematics

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“…Furthermore, it does not require maintaining active connections to more than a single BS reducing the complexity of the UE implementation. However, by joining this technique with multiconnectivity one may attain additional gain in terms of session service performance [54].…”

Section: B Reliable Communications and Session Continuitymentioning

confidence: 99%

“…1(b). In city squares, BSs may also be installed along the perimeter [54], [84]. Finally, the dimensions of blockers, e.g., vehicles, can be comparable to the communications distances and thus one may need to take into account detailed blockers geometry.…”

Section: A Deployment Modelsmentioning

confidence: 99%

A Tutorial on Mathematical Modeling of Millimeter Wave and Terahertz Cellular Systems

Moltchanov¹,

Sopin²,

Begishev³

et al. 2021

Preprint

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Millimeter wave (mmWave) and terahertz (THz) radio access technologies (RAT) are expected to become a critical part of the future cellular ecosystem providing an abundant amount of bandwidth in areas with high traffic demands. However, extremely directional antenna radiation patterns that need to be utilized at both transmit and receive sides of a link to overcome severe path losses, dynamic blockage of propagation paths by large static and small dynamic objects, macro-and micromobility of user equipment (UE) makes provisioning of reliable service over THz/mmWave RATs an extremely complex task. This challenge is further complicated by the type of applications envisioned for these systems inherently requiring guaranteed bitrates at the air interface. This tutorial aims to introduce a versatile mathematical methodology for assessing performance reliability improvement algorithms for mmWave and THz systems. Our methodology accounts for both radio interface specifics as well as service process of sessions at mmWave/THz base stations (BS) and is capable of evaluating the performance of systems with multiconnectivity operation, resource reservation mechanisms, priorities between multiple traffic types having different service requirements. The framework is logically separated into two parts: (i) parameterization part that abstracts the specifics of deployment and radio mechanisms, and (ii) queuing part, accounting for details of the service process at mmWave/THz BSs. The modular decoupled structure of the framework allows for further extensions to advanced service mechanisms in prospective mmWave/THz cellular deployments while keeping the complexity manageable and thus making it attractive for system analysts.

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“…According to it, when blockage occurs, it is possible to switch to another BS that is currently non-blocked. This technique has been shown to drastically improve performance of conventional terrestrial users, see, e.g., [ 13 , 14 ]. To assess the coverage of 5G mmWave NR deployments with multiconectivity functionality for UAV users, simple and accurate line-of-sight (LoS) blockage models are thus required [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Closed-Form UAV LoS Blockage Probability in Mixed Ground- and Rooftop-Mounted Urban mmWave NR Deployments

Begishev

Moltchanov

Gaidamaka

et al. 2022

Sensors

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Unmanned aerial vehicles (UAV) are envisioned to become one of the new types of fifth/sixth generation (5G/6G) network users. To support advanced services for UAVs such as video monitoring, one of the prospective options is to utilize recently standardized New Radio (NR) technology operating in the millimeter-wave (mmWave) frequency band. However, blockage of propagation paths between NR base stations (BS) and UAV by buildings may lead to frequent outage situations. In our study, we use the tools of integral geometry to characterize connectivity properties of UAVs in terrestrial urban deployments of mmWave NR systems using UAV line-of-sight (LoS) blockage probability as the main metric of interest. As opposed to other studies, the use of the proposed approach allows us to get closed-form approximation for LoS blockage probability as a function of city and network deployment parameters. As one of the options to improve connectivity we also consider rooftop-mounted mmWave BSs. Our results illustrate that the proposed model provides an upper bound on UAV LoS blockage probability, and this bound becomes more accurate as the density of mmWave BS in the area increases. The closed-form structure allows for identifying of the street width, building block and BS heights, and UAV altitude as the parameters providing the most impact on the considered metric. We show that rooftop-mounted mmWave BSs allow for the drastic improvement of LoS blockage probability, i.e., depending on the system parameters the use of one rooftop-mounted mmWave BS is equivalent to 6–12 ground-mounted mmWave BSs. Out of all considered deployment parameters the street width is the one most heavily affecting the UAV LoS blockage probability. Specifically, the deployment with street width of 20 m is characterized by 50% lower UAV LoS blockage probability as compared to the one with 10 m street width.

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Joint Use of Guard Capacity and Multiconnectivity for Improved Session Continuity in Millimeter-Wave 5G NR Systems

Cited by 19 publications

References 29 publications

Resource System with Losses in a Random Environment

Resource System with Losses in a Random Environment

A Tutorial on Mathematical Modeling of Millimeter Wave and Terahertz Cellular Systems

Closed-Form UAV LoS Blockage Probability in Mixed Ground- and Rooftop-Mounted Urban mmWave NR Deployments

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