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Secure and high speed cooperative small cells for cost and energy effective 5G network - 5GNET

Type of activity
Competitive project
Funding entity
AGAUR. Agència de Gestió d'Ajuts Universitaris i de Recerca
Funding entity code
2013 DI 053
27.360,00 €
Start date
End date
Small cells are envisaged as the vehicle for ubiquitous 5G services providing cost-effective high
speed communications. Pivotal to the 4G revolution is the well-known femto-cell concept, which is
currently the market solution for providing energy-efficient high speed internet access for indoor
scenarios. Complementary to femto-cell technology, the LTE-A standard delivers the outdoor
version in the form of pico-cell deployment suited for wide area coverage; however, the latter
requires radio networking infrastructure and careful planning, which translates to a significant cost
for mobile operators. Nevertheless, indoor femto-cell technology is here to stay with a desirable
energy rating making it a winning candidate for a basic building block on which to evolve mobile
networks of the future. Therefore, an intriguing question arises: what if we were to break with the
current mould of typical femto applications and extend femto accessibility to the outdoor world?
then, perhaps, we would stumble upon the next generation of femto-cell technology for 5G
networks. This question has been partly answered by today´s small cell technology, either using
fixed outdoor devices (metrocells) that provide femto-like services, or by mobile devices through
tethering, but all of them provide limited , interoperability, and coverage. Hence, to fully answer
this question, this proposal extends the notion of femto applications towards outdoor scenarios by
employing virtual small cells. These small cells are set up on demand, and constitute a “wireless
network of cooperative small cells” that have a plethora of high speed backhaul connections to
the mobile network.
Based on the aforementioned design requirements, the present 5GNET proposal aims to design,
implement and demonstrate an innovative protocol stack for a new line of next generation small
cells that delivers ubiquitous, cost and energy-effective and high speed connectivity at any time
and at any place to support 5G services in a secure fashion. 5GNET exploits promising technologies, such as “network coding” and “node cooperation”, working in synergy with
"interference management policies and small cells” to provide a new radio networking topology
and terminals forming part of the 5G paradigm. In particular, the 5GNET specific objectives
. - Investigate and demonstrate a new networking topology to provide ubiquitous virtual small cell
access (high throughput, low energy consumption) via a high speed backhaul link for outdoor
scenarios by exploiting cooperation and networking coding in synergy with LTE-A networks;
- Study of coexistence between between virtual small cells and macro cells and to propose
interference aware network-coded cooperation;
- Investigate advanced secure network-coding given network coded cooperative networks to
secure the privacy of users and contents as well as preventing jammers and free riders;
The proposed work is broken down in 3 Tasks:
Task 1 "Network coded cooperation": This task is devoted to the analysis, the design, and the
optimization of cooperative wireless networks with wireless network coding. The key objective is
to study the ultimate performance (diversity) and rate (multiplexing) trade-off of these networks for
practical wireless conditions, and to infer, from this study, practical design guidelines for their
design and optimization. The following key issues will be investigated: i) the design of smart
relaying schemes and associated decoding that exploit network coding without scarifying the endto-end reliability(robustness to error propagation); ii) the impact of network channel state
information on reliability and throughput; and iv) the design of high-rate MAC and RRM protocols
that maintain a practical ratio between data and signaling.
Task 2 "Virtual small cell coexistence with cellular networks": This task is devoted to the analysis,
the design, and the optimization of heterogeneous cellular networks where macro and small cells
create a multi-tier architecture for better coverage and higher throughput. The main objective is to
study the ultimate performance of these multi-tier networks by taking into account the random and
unplanned nature of small cells interference. To this end, we will leverage a new methodological
approach that is based on the application of stochastic geometry and random networks theory.
The following key issues will be investigated: i) the analysis of coverage, rate, and performance of
macrocell users in the presence of small cell interference under different access policies (open,
closed, hybrid) and multi-antenna technologies; ii) the development of new cell associations
mechanisms that take into account the inhomogeneous nature of the different cellular tiers
Task 3 "Cooperative protocols for intrusion detection": This task is devoted to the design
cooperative protocols to be used between nodes in a wireless multihop network that will allow the
detection of compromised nodes (intrusion detection) and react by implementing quarantine
measures. An underlying cooperation protocols based on cross-layer design will developed,
whilst security extensions to ensure that nodes do not check every packet and multiple nodes
perform multiple checks will be considered; the cooperation protocol must be designed so that
when injected/corrupted packets are detected, nodes alert their 1-hop neighbours. This will allow
a distributed detection scheme that will greatly increase the detection capability of compromised
nodes and significantly decrease the computation overhead in each node.
In general, our research methodology will include modelling and analysis, as well as simulation
and real-life experimentation. Depending on the nature of the proposed algorithms and protocols,
Markov Chains, Game Theory, Stochastic Geometry will be used. The developed algorithms will
be mapped into basic building blocks and will be integrated on a well-validated custom made
system level simulator of IQUADRAT. Finally, experimental studies will be conducted by using
off-the-shelf shelf products.
Adm. Generalitat
V Pla de Recerca i Innovació de Catalunya (PRI). 2010-2013
Call year
Funding call
Doctorats Industrials
Grant institution
Agència De Gestió D'ajuts Universitaris I De Recerca (agaur)