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Project stages and expected results PDF Print E-mail

In order to achieve the ambitious objectives described, the STEM-Net project has been organized in four Work Packages which will be undertaken in close collaboration by the three research units providing each other their complementary skills.


This WP is based on the analysis and characterization of the application scenarios aiming to defining the role of stem nodes within each communication scenario.

The activities in this WP will define in detail the research context for stem devices and provide the basis for other activities.

The WP is organized in 2 activities:

A1.1 Characterization of the application scenarios and the role of stem nodes

The necessity of using reconfigurable devices is strongly related to a range of modern communication applications and scenarios that require these reconfiguration functions; therefore, a careful identification of these environments, is a prerequisite for the design of these new technologies without neglecting the analysis of consequences coming from the use of stem devices in access networks.

A1.2 Basic hardware and software characteristics for the stem nodes

After conducting a thorough analysis of application scenarios in the activity A1.1, it will be necessary to identify essential functions and physical characteristics which stem nodes must have to enable the realization of the proposed scenarios efficiently.


R1.1 - An integrated and full vision of the innovative applications well suited for stem devices and the role of stem nodes within each application.

R1.2 - Determination of a basic set of hardware/software features, and specific functionalities for stem nodes.

WP1 will cover the first year of the project according to the attached GANTT chart. Results in R1.1 must be completed within the first 8 months of the first year.

Results in R1.2 must be completed within the end of the first year to be widely used in the second year.


This WP is mainly focused on aspects related to the design of a stem node and the currently available technologies that can be used, after an appropriate integration or modification, to implement the functionalities already highlighted in the scenarios proposed in WP1and required by a single stem node.

The WP is organized in 4 activities:

A2.1: Stem nodes' reconfigurable features at any level of the protocol stack

The main and innovative objective of this project is mainly to identify and implement the reconfiguration functionalities of the stem nodes, these features must be based on the identification of a flexible protocol architecture that gives the possibility of incorporating new functions, serving as repository of information accumulated during the stem device life cycle, allowing exchange of information between different levels in a cross-layer fashion also implementing control functions .

A2.2: Techniques for reconfiguring the physical and MAC layer parameters of stem nodes

The stem nodes reconfiguration functions can be implemented at different levels of the protocol stack , so this activity will be specifically devoted to the determination of physical and MAC layer reconfigurable parameters according to the characteristics of the wireless environment in which the device operates and the infrastructure present in it. It will be also analyzed the impact of the cognitive cycle and physical and MAC layer reconfiguration on the network and transport protocol layers.

A2.3: Techniques for reconfiguring the upper layers parameters of stem nodes

Following from the goals of the previous activities, the enabling technologies for supporting the protocol reconfiguration at the higher layers of the protocol stack, will be studied and implemented, when nodes are allowed to multi-home because of their several wireless interfaces.

A2.4: Impact of controlled mobility on the stem node's performance

When the stem node is a mobile node, all the issues discussed in the previous activities can be seen with a different light, since mobility brings new challenges and constraints. In this context it is necessary to define mathematical models to determine the role of topology or of any change of topology for stem nodes resources optimization in terms of energy, transmission band and propagation delays.


R2.1 - Definition of reconfiguration techniques for stem nodes at all levels of the protocol stack.

R2.2 - Impact assessment of the nodes mobility and changes of topology on the stem devices performance.

WP2 will continue for 16 months according to the attached GANTT chart. Results in R2.1 must be completed within the first 4 months of the first year. Results in R1.2 must be completed within the second 4 months of the second year.


This WP is mainly focused on cooperative communication between different stem nodes in order to form an intelligent, flexible and adaptive network to perform the functions identified in WP1.

The WP is organized in 3 activities:

A3.1: Cooperative protocols based on controlled mobility and algebraic network coding schemes

In this activity we will study the issues of cooperation between stem nodes according to their mobility patterns using algebraic network coding schemes in situations where some of the nodes involved in the communication flow act as a simple relay station. Furthermore, we will define distributed algorithms for determining the optimal placement of stem units for a particular task or situation.

A3.2: Impact of cooperation schemes among stem units on the configuration/learning process

The configuration/learning process of the stem nodes can undoubtedly take advantage from the cooperation between network nodes such as occurs in human interaction, so this activity will be mainly focused on the analysis of the impact of new cooperative patterns to accelerate the configuration/learning process.

A3.3: Strategies for roles assignment in the reconfiguration process and scheduling techniques to support cooperation

Cooperation between stem nodes implies a proper exchange of messages between distributed entities that cannot be implemented without a distributed and efficient scheduling scheme to support the roles assigned to each stem device.


R3.1 - Determination of cooperative interactions based on controlled mobility for stem units.

R3.2 - Definition and implementation of cooperation techniques that allows nodes to implement a common behavior.

R3.3 - Definition of effective network topologies to satisfy a demand for quality of service or the execution of a common task.

WP3 will continue for 16 months according to the attached GANTT chart. Results in R3.1 and R3.2 must be completed within the first 4 months of the second year.

Results in R3.2 must be completed within the second 4 months of the second year.


This WP focuses on testing and evaluating the solutions proposed and analyzed in previous WPs, in particular software simulators to verify the behavior of the proposed stem units will be developed. Finally, we will implement a demonstrator of a "proto-stem" unit in order to highlight the obtained research results.

A4.1: Simulators to validate and evaluate the proposed solutions

This activity will be devoted to the simulation of cooperative protocols employing algebraic network coding and the testing of distributed algorithms for determining the optimal placement of stem nodes able to use controlled mobility.

A4.2: Implementation of “proto-stem” units

Final goal of the STEM-Net project will consist in the implementation of a "proto-stem" device that is able to reconfigure a limited number of parameters at different protocol stack layers through enforcing learning techniques and communication with other stem nodes. An example of such a device may be a smart phone that can also behave as a router or gateway.


R4.1 - Simulation of a system that seeks to demonstrate the feasibility of an overall behavior through spontaneous reconfiguration of network nodes.

R4.2 - Implementation of a demonstrator that implements cooperation between nodes that pooling their resources to achieve a common goal.

WP4 will continue for the whole second year according to the attached GANTT chart. Results in R4.1 and R4.2 must be completed at the end of the second year.

Project Management

The coordinator will carry out the project management activity, aimed at ensuring the advancement of the project according to the projects' objectives. To the above purpose, a project web site and forum shall be established, and appropriate periodical meetings shall be organized (normally, a plenary meeting twice every years).


P.R.I.N. 2009


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