Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio WORLD Project – KO Meeting University of Catania

Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio Research Activities (AR) UNICT proposal WP1: System Architecture –T1.2: WORLD system plan WP5: Cross-layer Wireless Multimedia and Active QoS-Mapping –T5.2: Opportunistic access and node auto set up –T5.3: Game-Theory-based distributed radio resource management WP6: Applications and secure End-to-End QoS-provisioning (leadership) –T6.2: Opportunistic scalable video and audio coding for adaptive streaming applications –T6.4: Multimedia Peer-to-Peer (P2P) WLAN connections

T1.2: World System Plan We will collaborate to the definition of System and network architecture (Context awareness and reconfigurability techniques, QoS support mechanisms) Protocol architecture (Cross layer interactions, QoS transversal support) Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio

T5.2: Opportunistic Access and Node auto set up

Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio T5.2: Opportunistic Access and Node auto set up Nodes opportunistically enter and exit the P2P network Mechanisms to let nodes self-reconfigure and discover other devices and services will be needed Discovery procedures should be characterized both in terms of performance and algorithms

T5.2: Opportunistic Access and Node auto set up To automatically set up nodes, it will be required to: –Localize –Distribute a catalogue of the available resources Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio

Localization Infostation nodes are also available into the network Some nodes are equipped with GPS Other nodes do not Location information is needed to implement a distributed algorithm for resources propagation into the network We will develop a middleware allowing nodes localization through some fixed position-aware nodes Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio

Localization This middleware will allow to –Perform an algorithm to let the nodes calculate their position exploiting position-aware nodes Send beacon packets Use these packets to estimate the packet loss probability (PLP) Use the PLP to evaluate the bit error probability (BEP) Estimate the SNR Obtain the distribution of the SNR Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio

Resources catalogue: A mobile world Rapid increase in the amount of multimedia contents created “on the road” Pervasive use of personal portable devices Users typically share contents by non-mobile systems (P2P sharing program; social network) User friendly interface to easily share and exchange data through heterogeneous information systems and communication technologies in the near future but

What is our target? To provide a general purpose platform whose aim is to create data sharing services in mobile environment in a modular and adaptive way Some scenarios: –Music festivals: where people could share contents (photos, songs, videos) –Municipal services –Cultural activities –Mobile social network

Existing solutions Several works in literature deal with the problem of data sharing in mobile environments Solutions based on novel protocols or different transmission techniques are proposed to solve the architectural and technical problems: –Web-service based platform (Internet access is required) –Instant messaging architecture (server based scheme) –Mobile P2P solutions (using the cellular network) The majority of the existing solutions are related to specific applications and use an infrastructured scheme

Idea ShareAnywhere (SA) will be a platform which provides an application framework where mobile devices make use of user- friendly methods to share and exchange digital contents among heterogeneous systems and through different communication technologies.

Logical Architecture Mobile Nodes: Cellular phones, PDAs and Notebooks running an appropriate software InfoStations: Network nodes revealing the presence of mobile nodes and providing resources CMS: Non-mobile system front-end to upload the resources Database: element storing all the system resources

T5.3: Game-Theory based distributed radio resource management

Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio T5.3: Game-Theory based distributed radio resource management Infostations will be used by mobile nodes to download the required information when located in the proximity In case of multimedia applications playout buffers length should be taken into account when considering the possibility to download frames during the limited proximity time Requests being sent to the infostation nodes should be managed according to a priority-like mechanism taking into account the limited proximity time, the remaining energy and the above mentioned playout buffer residual length A game modeling of this problem will be provided

T5.3: Game-Theory based distributed radio resource management A traditional CSMA/CA model will be modified to allow support of priority differentiation in traffic management Network management will be performed by means of a jamming policy Game modeling will imply –Use of a utility function (U)=node throughput (r ) –Use of a penalty function (P)=difference in throughput due to nodes deviation from the expected throughput –Use of a payoff function (f) f=U-P to be maximized based on the different nodes priority (q) –-node priority (q) depending on playout buffer residual length (Q), residual energy (E) and residual time in the proximity of the infostation(T) Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio

T5.3: Game-Theory based distributed radio resource management Strategy: identified with the values assumed by the contention window size at the observation time Access probability Node throughput Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio

T5.3: Game-Theory based distributed radio resource management Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio Payoff Priority Expected throughput

T5.3: Game-Theory based distributed radio resource management Definition of a distributed algorithm for reaching the Pareto Optimal Equilibria and letting the system work around it

T6.2: Opportunistic scalable video and audio coding for adaptive streaming applications

Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio T6.2: Opportunistic scalable video and audio coding for adaptive streaming applications The main target of this activity will be evaluation of the impact of using opportunistic techniques for support of multimedia traffic in P2P wireless networks Multimedia Coding impacts on –File size and consequent storage requirements –The way the resource is distributed into the network (many copies at different coding quality can be distributed) Resource distribution should consider inter- contact time distribution!

T6.2: Opportunistic scalable video and audio coding for adaptive streaming applications Two strategies will be prosecuted: Software implementation Simulation

T6.4: Multimedia Peer-to-Peer (P2P) WLAN connections

Roma 17/10/08 WORLD Project KO Meeting Laura Galluccio T6.4: Multimedia Peer-to-Peer (P2P) WLAN connections Due to the limited bandwidth resources in wireless channels redundancy should be reduced To this purpose network coding can be used in P2P multihop communication environments Network coding allows to combine different files’ chunks so as to reduce energy consumption, increase capacity and thus throughput, and should be variable according to network conditions Drawbacks are longer processing and thus increase in delivery delay We will analitically characterize the problem Then, we will define and test an algorithm for estimating system performance

T6.4: Multimedia Peer-to-Peer (P2P) WLAN connections Energy efficient data routing will be addressed as well Knowledge of position is required and can be obtained by mean of localization techniques as discussed above Once known the position, geographical forwarding can be exploited to forward information

T6.4: Multimedia Peer-to-Peer (P2P) WLAN connections Same Payload size S D Header size equal to S H and S HNC ~2 S H Node density around node A equal to  A

T6.4: Multimedia Peer-to-Peer (P2P) WLAN connections

Summarizing… WP5: Cross-layer Wireless Multimedia and Active QoS- Mapping –T5.2: Opportunistic access and node auto set up Localization (just started!) Resource catalogue (ongoing!!!) –T5.3: Game-Theory-based distributed radio resource management (ongoing!!) WP6: Applications and secure End-to-End QoS- provisioning (leadership) –T6.2: Opportunistic scalable video and audio coding for adaptive streaming applications (just started!) –T6.4: Multimedia Peer-to-Peer (P2P) WLAN connections (ongoing!)