Mobile network operators are currently witnessing a decoupling between aggregate traffic demand and revenues In addition both OPEX and CAPEX are increased since to enhance capacity small cells with higher densiity need to be deployed Network sustainability requires novel solutionsto be implemented.

A DTN Perspective on Mobile Relays for Cellular Networks

Vasilis FriderikosCentre for Telecommunication Research, King’s College London

E-mail: vasilis.friderikos@kcl.ac.uk

For the Interested Reader

Objectives and Rationale

P. Kolios, V. Friderikos, K. Papadaki, Ultra low energy store-carry and forward relaying within the cell, IEEE Vehicular Technology Conference, Sept. 2009, pp. 1-5

Panayiotis Kolios, Vasilis Friderikos, Katerina Papadaki, A practical approach to energy efficient communications in mobile wireless networks, Mobile networks and applications (MONET), 2011, Online ISSN 1383-469X

Panayiotis Kolios, Vasilis Friderikos, Katerina Papadaki, Future wireless mobile networks, IEEE Vehicular Technology Magazine, 6 (1). pp. 24-30, 2011

With the shift to mobile Internet services, voice has become only part of a bigger ecosystem with a plethora of services. The penetration of smart-phones and mobile Internet applications has contributed to an exponentialgrowth in demand

A Paradigm Shift from Voice to Data

By store-carry and forward we trade-off message delivery delays for energy efficiency by simply postponing communication for future time instances with better channel gains Applications

Email client synchronizationOn demand video content accessNews feeds, Social networking and the like

Where are the gains coming from?

Utilizing Service Elasticity and User Mobility to Reduce Energy Cost

Future Perspectives Proximity-based Services (ProSe) – which is a new study Item for 3GPP Rel-12Application of store carry and forward relying in different families of elastic cloud based applications:

Storage as a Service (StaaS) Processing as a Servce (PraaS) Software as a Service (SaaS)

Set of Benefits of Performing Store Carry and Forward Transmissions

Key Results

Increased Spatial Capacity

Reduced blockingprobability for real

timetraffic

Switching-off LowUtilization BSs

Energy Savingsat BSs (downlink)

Load Balancing Across Cells

Less co-channelinterference

Don't transmithere!

Transmithere!

1000 times better quality signal

thousandtimes !

Total energyconsumption

RF energy consumption

Reduction on energy consumption

Co-channel interference reduction due to the localization of the transmissions