1,549 research outputs found
A Hybrid Model to Extend Vehicular Intercommunication V2V through D2D Architecture
In the recent years, many solutions for Vehicle to Vehicle (V2V)
communication were proposed to overcome failure problems (also known as dead
ends). This paper proposes a novel framework for V2V failure recovery using
Device-to-Device (D2D) communications. Based on the unified Intelligent
Transportation Systems (ITS) architecture, LTE-based D2D mechanisms can improve
V2V dead ends failure recovery delays. This new paradigm of hybrid V2V-D2D
communications overcomes the limitations of traditional V2V routing techniques.
According to NS2 simulation results, the proposed hybrid model decreases the
end to end delay (E2E) of messages delivery. A complete comparison of different
D2D use cases (best & worst scenarios) is presented to show the enhancements
brought by our solution compared to traditional V2V techniques.Comment: 6 page
A Novel Device-to-Device Discovery Scheme for Underlay Cellular Networks
Tremendous growing demand for high data rate services such as video, gaming
and social networking in wireless cellular systems, attracted researchers'
attention to focus on developing proximity services. In this regard,
device-to-device (D2D) communications as a promising technology for future
cellular systems, plays crucial rule. The key factor in D2D communication is
providing efficient peer discovery mechanisms in ultra dense networks. In this
paper, we propose a centralized D2D discovery scheme by employing a signaling
algorithm to exchange D2D discovery messages between network entities. In this
system, potential D2D pairs share uplink cellular users' resources with
collision detection, to initiate a D2D links. Stochastic geometry is used to
analyze system performance in terms of success probability of the transmitted
signal and minimum required time slots for the proposed discovery scheme.
Extensive simulations are used to evaluate the proposed system performance.Comment: Accepted for publication in 25'th Iranian Conference on Electrical
Engineering (ICEE2017
Network-Assisted Device-to-Device (D2D) Direct Proximity Discovery with Underlay Communication
Device-to-Device communications are expected to play an important role in
current and future cellular generations, by increasing the spatial reuse of
spectrum resources and enabling lower latency communication links. This
paradigm has two fundamental building blocks: (i) proximity discovery and (ii)
direct communication between proximate devices. While (ii) is treated
extensively in the recent literature, (i) has received relatively little
attention. In this paper we analyze a network-assisted underlay proximity
discovery protocol, where a cellular device can take the role of: announcer
(which announces its interest in establishing a D2D connection) or monitor
(which listens for the transmissions from the announcers). Traditionally, the
announcers transmit their messages over dedicated channel resources. In
contrast, inspired by recent advances on receivers with multiuser decoding
capabilities, we consider the case where the announcers underlay their messages
in the downlink transmissions that are directed towards the monitoring devices.
We propose a power control scheme applied to the downlink transmission, which
copes with the underlay transmission via additional power expenditure, while
guaranteeing both reliable downlink transmissions and underlay proximity
discovery.Comment: Accepted for presentation at Globecom 201
Enabling Disaster Resilient 4G Mobile Communication Networks
The 4G Long Term Evolution (LTE) is the cellular technology expected to
outperform the previous generations and to some extent revolutionize the
experience of the users by taking advantage of the most advanced radio access
techniques (i.e. OFDMA, SC-FDMA, MIMO). However, the strong dependencies
between user equipments (UEs), base stations (eNBs) and the Evolved Packet Core
(EPC) limit the flexibility, manageability and resiliency in such networks. In
case the communication links between UEs-eNB or eNB-EPC are disrupted, UEs are
in fact unable to communicate. In this article, we reshape the 4G mobile
network to move towards more virtual and distributed architectures for
improving disaster resilience, drastically reducing the dependency between UEs,
eNBs and EPC. The contribution of this work is twofold. We firstly present the
Flexible Management Entity (FME), a distributed entity which leverages on
virtualized EPC functionalities in 4G cellular systems. Second, we introduce a
simple and novel device-todevice (D2D) communication scheme allowing the UEs in
physical proximity to communicate directly without resorting to the
coordination with an eNB.Comment: Submitted to IEEE Communications Magazin
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