An Integrated Framework for Fog Communications and Computing in Internet of Vehicles
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1 University of Florence Department of Information Engineering An Integrated Framework for Fog Communications and Computing in Internet of Vehicles Alessio Bonadio, Francesco Chiti, Romano Fantacci
2 Outline 1 Introduction Fog Communications & Computing Vehicular Fog Communications & Computing Consensus based ITS Applications GAUChO Project Vision Proposed Integrated Framework System Model Communication Protocols Framework Modeling & Validation Simulated Model Performance Evaluation Conclusions
3 Introduction Fog Communications & Computing 2 Cloud Computing (CC): ubiquitous on-demand access to remote computing and storage platforms Fog Computing (FC): emerging paradigm that extends CC towards the network edge where applications/services run directly over end-devices FC goals: improve efficiency reduce data processing and storage latency Fog Communication and Computing (FC 2 ): novel paradigm supporting configurability, adaptability, flexibility and energy/spectrum-efficiency
4 Introduction Vehicular Fog Communications & Computing 3 Internet of Vehicles (IoV): wireless ecosystem that allows vehicles to locally gather, exchange and refine traffic-related information FC 2 vision enhance reactiveness to sudden context variations and support real-time data analysis Mobile Ad hoc NETworks (MANETs): integrating vehicles and roadside units (RSUs) IEEE 1609/WAVE: present reference standard vehicle-to-vehicle (V2V) and RSU-to-vehicle (R2V) interfaces future 5G mobile communication systems: abstract and flexible vehicle-to-everything (V2X) communication mode
5 Introduction Consensus based ITS Applications 4 Traffic safety and management via information broadcasting Cooperative applications, where a group of vehicles spontaneously make coordinated and mutually consistent decisions agreement on the exchanged data is essential Proximity Area Group A Group B Anycast transmission Inter-group communication Data gathering and fusion
6 Introduction GAUChO Project Vision I Green Adaptive Fog Computing and Networking Architecture (GAUChO) I I I I MIUR PRIN Bando 2015 (Grant 2015YPXH4W-004) novel distributed and heterogeneous architecture able to integrate and jointly optimize FC and FN capabilities supporting low-latency, energy-efficiency, security, self-adaptation, and spectrum efficiency Task T1.3: advanced methodologies for network formation, allowing fixed or mobile devices to be connected, and to achieve a full context-awareness by means of exchanging and jointly refining context-related information Pisa, September 6th 2018 An Integrated Framework for Fog Communications and Computing in Internet of Vehicles 5
7 Proposed Integrated Framework System Model 6 Vehicular Fog Architecture VFN FC \ VFC VFN VFN \ VFN VFD VFC VFN VFN VFN VFD VF Domains (VFDs): VF Nodes (VFNs) + VF Controllers (VFCs) logical (overlaying application) and physical (underlying network) communications interfaces Fog Controller (FC) for interoperability among VFDs
8 Proposed Integrated Framework System Model 7 VFN Reference Model Consensus Sensing APP NET Layer IEEE p MAC IEEE p PHY Consensus Sensing (CS) Application designed according to BC technology no Transport Layer (i.e., UDP like) as usual in VANETs Network Layer functionalities Physical and Data Link Layers compliant with IEEE p modeled with OMNeT++/Veins environment
9 Proposed Integrated Framework Application Layer 8 Proposed CS protocol for information reconciliation designed according to the BlockChain (BC) technology participants write and read from a distributed ledger, i.e., a chain that records all the observations/decisions common view of the overall information integrity and consistency of the ledger and non ambiguous ordering 1. once the network is formed, a VFN sends collected information via ObservationMessages (OMs) extends WaveShortMessage 2. each VFN updates its block as information is received 3. each VFN initiates the validation phase sending the validated block to other VFNs via a ValidationMessage (VM) a WaveShortMessage that contains the Proof of Work (PoW) probabilistic model of the validation latency block size B = N/2, where N is the number of VFNs
10 Proposed Integrated Framework Network Layer 9 Delay Tolerant Network (DTN): support data dissemination over links that may lack continuous connectivity: Geographic protocols, which are based on nodes location Epidemic protocols: inherent anycast addressing scheme suited for CS applications 1. Blind Flooding (BF): each node forwards the received message to all its neighbors 2. TTL-based Flooding (TF): a Time To Live (TTL) counter limits the retransmission of a message 3. Probability-based Flooding (PF): each node retransmits the message to its neighbors with a probability P Generalized Multiflow Network Coding (NC): enhanced DTN approach where each VFN iteratively stores, carries and forwards a random linear combination of the previously received packets (blocks)
11 Proposed Integrated Framework Network Layer 10 Chord protocol: decentralized peer-to-peer (P2P) overlay network based on distributed hash tables (DHT) mapping of keys into nodes (L2 and L3 addresses resolution) O(log N) known nodes for each VFN O((log N) 2 ) messages to manage join and leave topology changes in a dynamic and distributed way n 14 n 15 n 0 n 1 n 2 n 56 n 1 n 8 n 13 n 3 n 52 n 14 n 12 n 4 n 48 n 11 n 5 n 42 n 21 n 10 n 9 n 8 n 7 n 6 n 38 n 32
12 Framework Modeling & Validation Performance Evaluation 11 Epidemic DTN grid map imported from Open Street Map accident management (N = 50) Veins Car and RSU modules communication provided by Nic80211p via WaveShortMessages reached VFNs: TF worst (70%) BF and PF comparable protocol overhead: PF outperforms BF (P = 0.5 it is about 1/7)
13 Framework Modeling & Validation Performance Evaluation 12 Multiflow Network Coding diamond topology: two Relay + Sender (S) + Receiver (R) Relay only performs store, combine and forward external library (Eigen) to manage the messages cod & decoding module entirely developed, messages are WaveShortMessages S R NC overhead: gap w.r.t. BF increases at the increasing of packet block size diversity gain provided by the two independent Relays
14 Framework Modeling & Validation Performance Evaluation 13 Chord more realistic map and traffic patterns (default Erlangen map on SUMO mobility simulator) N = 35, Small-World Network paradigm Car and RSU Veins modules communication provided by Nic80211p new P2PMessage (P2PM) extending WaveShortMessage Chord overhead (P2PMs + OMs): two different networks formed overhead gradually decreases with time P2PMs higher than OMs: Chord network formation more critical
15 Framework Modeling & Validation Performance Evaluation 14 Routing Protocols Comparison number of messages per vehicle needed to disseminate an information block: BF DTN 10 3 NC 10 2 Chord but Chord always supports reliable data distribution thus representing the better candidate Pisa, September 6 th 2018 An Integrated Framework for Fog Communications and Computing in Internet of Vehicles
16 Framework Modeling & Validation Performance Evaluation 15 CS Application Layer related metric: overall latency need to validate a block integrated BlockChain over Chord networks two different PoW time duration intervals good scalability w.r.t. the number of FVNs (N)
17 Conclusions Concluding Remarks 16 FC 2 paradigm application to context awareness VANET services Integrated system architecture APP and NET Layers DTN Flooding based, NC multiflows and Chord protocols BC technology for distributed consensus making Modelling and Development with OMNeT++/Veins Framework modularity, high fidelity and flexibility Comprehensive simulation campaign Chord reactiveness in topology controlling allows a fast and reliable consensus achievement and flexibility Future Developments: Redesign over 4G/5G systems with SimuLTE+Veins Extension to FANETs using OLSR and Paxos protocols
18 University of Florence Department of Information Engineering An Integrated Framework for Fog Communications and Computing in Internet of Vehicles Alessio Bonadio, Francesco Chiti, Romano Fantacci
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