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Resource Management in Fog-Enhanced Radio Access Network to Support Real-Time Vehicular Services
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).ORCID iD: 0000-0003-3478-9890
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).ORCID iD: 0000-0001-6704-6554
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2017 (English)In: Proceedings - 2017 IEEE 1st International Conference on Fog and Edge Computing, ICFEC 2017, Institute of Electrical and Electronics Engineers (IEEE), 2017, p. 68-74, article id 8014361Conference paper, Published paper (Refereed)
Abstract [en]

With advances in the information and communication technology (ICT), connected vehicles are one of the key enablers to unleash intelligent transportation systems (ITS). On the other hand, the envisioned massive number of connected vehicles raises the need for powerful communication and computation capabilities. As an emerging technique, fog computing is expected to be integrated with existing communication infrastructures, giving rise to a concept of fog-enhanced radio access networks (FeRANs). Such architecture brings computation capabilities closer to vehicular users, thereby reducing communication latency to access services, while making users capable of sharing local environment information for advanced vehicular services. In the FeRANs service migration, where the service is migrated from a source fog node to a target fog node following the vehicle's moving trace, it is necessary for users to access service as close as possible in order to maintain the service continuity and satisfy stringent latency requirements of real-time services. Fog servers, however, need to have sufficient computational resources available to support such migration. Indeed, a fog node typically has limited resources and hence can easily become overloaded when a large number of user requests arrive, e.g., during peak traffic, resulting in degraded performance. This paper addresses resource management in FeRANs with a focus on management strategies at each individual fog node to improve quality of service (QoS), particularly for real-time vehicular services. To this end, the paper proposes two resource management schemes, namely fog resource reservation and fog resource reallocation. In both schemes, real-time vehicular services are prioritized over other services so that their respective vehicular users can access the services with only one hop. Simulation results show that the proposed schemes can effectively improve one-hop access probability for real-time vehicular services implying low delay performance, even when the fog resource is under heavy load.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017. p. 68-74, article id 8014361
Keywords [en]
connected vehicle, Fog computing, real-time service, resource management
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-218549DOI: 10.1109/ICFEC.2017.17ISI: 000426944700008Scopus ID: 2-s2.0-85030309454ISBN: 9781509030477 (print)OAI: oai:DiVA.org:kth-218549DiVA, id: diva2:1161433
Conference
1st IEEE International Conference on Fog and Edge Computing, ICFEC 2017, Madrid, Spain, 14 May 2017
Note

QC 20171130

Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2019-08-27Bibliographically approved
In thesis
1. Ultra-low latency communication for 5G transport networks
Open this publication in new window or tab >>Ultra-low latency communication for 5G transport networks
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The fifth generation (5G) mobile communication system is envisioned to serve various mission-critical Internet of Thing (IoT) applications such as industrial automation, cloud robotics and safety-critical vehicular communications. The requirement of the end-to-end latency for these services is typically within the range between 0.1 ms and 20 ms, which is extremely challenging for the conventional cellular network with centralized processing. As an integral part of the cellular network, the transport network, referred to as the segment in charge of the backhaul of radio base stations or/and the fronthaul of remote radio unit, plays an especially important role to meet such a stringent requirement on latency.This thesis investigates how to support the ultra-low latency communications for 5G transport networks, especially for backhaul networks. First, a novel passive optical network (PON) based mobile backhaul is proposed and tailored communication protocols are designed to enhance the connectivity among adjacent base stations (BSs). Simulation results show that an extremely low latency (less than 1 ms packet delay) for communications among the BSs can be achieved, which thereby can be used to support fast handover for users with high mobility (e.g., vehicles).Furthermore, the thesis presents a fog computing enabled cellular networks (FeCN), in which computing, storage, and network functions are provisioned closer to end users, thus the latency on transport networks can be reduced significantly. In the context of FeCN, the high mobility feature of users brings critical challenges to maintain the service continuity with stringent service requirements. In the meanwhile, transmitting the associated services from the current fog server to the target one to fulfill the service continuity, referred to as service migration, has been regarded as a promising solution for mobility management. However, service migration cannot be completed immediately, and may lead to a situation where users experience loss of access to the service. To solve such issues, a quality-of-service (QoS) aware service migration strategy is proposed. The method is based on the existing handover procedures with newly introduced distributed fog computing resource management scheme to minimize the potential negative effects induced by service migration. The performance of the proposed schemes is evaluated by a case study, where realistic vehicle mobility pattern in the metropolitan network scenario of Luxembourg is used to reflect the real world environment. Results show that low end-to-end latency (e.g., 10 ms) for vehicular communication can be achieved with typical vehicle mobility. During service migration, both the traffic generated by migration and other traffic (e.g., control information, video) are transmitted via mobile backhaul networks. To balance the performance of the two kinds of traffic, a delay-aware bandwidth slicing scheme is proposed in PON-based mobile backhaul networks. Simulation results show that, with the proposed method, migration data can be transmitted successfully within a required time threshold, while the latency and jitter for non-migration traffic with different priorities can be reduced significantly.

Abstract [sv]

5:e generationens (5G) mobilnät förväntas stödja olika kritiska tillämpningar av Sakernas Internet (IoT), såsom industriell automation, moln-baserad robotik och säkerhetskritisk fordonskommunikation. Kravet på envägs totalfördröjning för dessa tjänster ligger typiskt i intervallet mellan 0,1 ms och 20 ms, vilket är extremt utmanande för det konventionella mobilnätet med centraliserad databearbetning. Transportnätet, det segment av nätet som är ansvarigt för sammankoppling av radiobasstationer (s.k. backhaul) och/eller anslutning av radioenheter (s.k. fronthaul), är en integrerad del av mobilnätet och spelar en särskilt viktig roll för att möta ett sådana stringenta krav på fördröjningen.Denna avhandling undersöker hur man kan stödja de kommunikation med ultralåga fördröjning för 5G-transportnät, speciellt för backhaul-nätverk. Först beaktas ett nytt passivt optiskt nätverk (PON) förmobil backhaul, och skräddarsydda kommunikationsprotokoll utformas för att förbättra uppkopplingen mellan alla angränsande basstationer (BS). Simuleringsresultat visar att en extremt låg fördröjning (mindre än 1 ms paketfördröjning) för kommunikation mellan basstationerna kan uppnås, vilket kan användas för att stödja snabb överlämning mellan basstationer (s.k. handover) för mobila användare med hög rörlighet (t.ex. fordon).Vidare presenterar avhandlingen ett dim-baserat (fog computing) mobilnät (FeCN), där databehandling, lagring och nätverksfunktioner tillhandahålls närmare slutanvändarna, vilket innebär att fördröjningen på transportnät kan minskas betydligt. I samband med FeCN är hantering av mobila användare en av de mest kritiska utmaningarna för användare som kännetecknas av hög rörlighet. Utmaningen är att upprätthålla tjänsten kontinuerligt och att uppfylla de stringenta tjänstekraven. Tjänstemigrering, dvs flytt av tjänster från en server till en annan på ett dynamiskt sätt, har betraktats som en lovande lösning för hantering av mobila användare. Tjänstemigrering kan dock inte slutföras omedelbart, vilket kan leda till en situation där användare upplever att de förlorar åtkomst till tjänsterna. För att lösa dessa frågor är föreslås en migreringsstrategi som beaktar tjänstekvaliteten (QoS). Metoden bygger på befintliga handover-procedurer med nyntroducerade resurshanteringssystem baserade på distribuerad fog computing, för att minimera de eventuella negativa effekter som induceras av tjänstemigrering. En fallstudie, baserad på ett realistiskt mobilitetsmönster för fordon i ett Luxemburg-scenario, genomförs med hjälp av simuleringsstudier för att utvärdera prestanda för de föreslagna systemen. Resultaten visar att låg fördröjning (t.ex., 10 ms) för fordonskommunikation kan uppnås med typisk fordonsmobilitet. Under tjänstemigrering skickas både trafiken genererad av migreringen och annan datatrafik (t.ex., kontrollinformation och video) via mobila backhaul-nätverk. För att balansera prestandan för de två typerna av trafik, föreslås ett system för bandreddsuppdelning i PON-baserade mobila backhaul-nätverk som tar fördröjning i beaktan. Simuleringsresultat visar att med den föreslagna metoden kan migreringsdata framgångsrikt överföras inom den tidsgräns som krävs, medan fördröjningen och fördröjningsvariationer v övrig trafik med olika prioriteringar kan minskas betydligt.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019
Series
TRITA-EECS-AVL ; 2019:59
National Category
Communication Systems
Research subject
Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-256503 (URN)978-91-7873-243-2 (ISBN)
Public defence
2019-09-20, Sal 308, ELECTRUM, Kistagången 16, Kista, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2019-08-27 Created: 2019-08-26 Last updated: 2019-08-27Bibliographically approved

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