852 research outputs found
Modeling D2D communications with LTE and WiFi
In this work we propose a roadmap towards the analytical understanding of Device-to-Device (D2D) communications in LTE-A networks. Various D2D solutions have been proposed, which include inband and outband D2D transmission modes, each of which exhibits different pros and cons in terms of complexity, interference, and spectral efficiency achieved. We go beyond traditional mode optimization and mode-selection schemes. Specifically, we formulate a general problem for the joint per-user mode selection, connection activation and resource scheduling of connections using both LTE and WiFi resources
Modeling and Analysis of MPTCP Proxy-based LTE-WLAN Path Aggregation
Long Term Evolution (LTE)-Wireless Local Area Network (WLAN) Path Aggregation
(LWPA) based on Multi-path Transmission Control Protocol (MPTCP) has been under
standardization procedure as a promising and cost-efficient solution to boost
Downlink (DL) data rate and handle the rapidly increasing data traffic. This
paper aims at providing tractable analysis for the DL performance evaluation of
large-scale LWPA networks with the help of tools from stochastic geometry. We
consider a simple yet practical model to determine under which conditions a
native WLAN Access Point (AP) will work under LWPA mode to help increasing the
received data rate. Using stochastic spatial models for the distribution of
WLAN APs and LTE Base Stations (BSs), we analyze the density of active
LWPA-mode WiFi APs in the considered network model, which further leads to
closed-form expressions on the DL data rate and area spectral efficiency (ASE)
improvement. Our numerical results illustrate the impact of different network
parameters on the performance of LWPA networks, which can be useful for further
performance optimization.Comment: IEEE GLOBECOM 201
Modeling Multi-mode D2D Communications in LTE
In this work we propose a roadmap towards the analytical understanding of
Device-to-Device (D2D) communications in LTE-A networks. Various D2D solutions
have been proposed, which include inband and outband D2D transmission modes,
each of which exhibits different pros and cons in terms of complexity,
interference, and spectral efficiency achieved. We go beyond traditional mode
optimization and mode-selection schemes. Specifically, we formulate a general
problem for the joint per-user mode selection, connection activation and
resource scheduling of connections.Comment: A shorter version of this manuscript is accepted for publication in
MAMA workshop collocated with Sigmetrics'1
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
The Impact on Full Duplex D2D Communication of Different LTE Transmission Techniques
© 2017 IEEE. To augment capacity of spectrum limited cellular systems, 3GPP proposed Licensed Assisted Access (LAA-LTE) while efforts are underway to standardize the standalone MulteFire (a small cell standalone version of LTE). LAA is expected to boost capacity of LTE via unlicensed spectrum (5GHz). On the other hand, recent advances in Self Interference Suppression (SIS) techniques allow radios to transmit and receive simultaneously on the same channel (i.e., in-band Full-Duplex, FD). As part of future wireless networks, Device-to-device (D2D) communications would find its great potential through this FD capability. However, due to high induced aggregate interference from FD and its impact on medium access probability, the rigorous and critical analysis is needed to find an optimum trade-off between performance efficiency and overheads. Using stochastic geometry and the random graph theory, in this article, we analyze the impact of different LTE network paradigms with HD/FD D2D devices. Moreover, the impact of state- of-the-art coexistence techniques (discontinuous transmission and listen-before-talk) recommended for LTE in unlicensed spectrum over HD/FD D2D network is also discussed. The analysis is supported with extensive simulation results that reveal insights of the coexistence mechanism efficiency employed by LTE, the impact of SIS and the cost of FD operation in D2D
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