Collision Avoidance enabled by 5G SDN enabled networks:


The  SCAN infrastructure consists of:

  • Rack——A Ganeti cluster for the support of the virtual-server cloud infrastructure with capacity of more than 100 VMs
  • —A variety of smartphones and laptops used as 802.11 and LTE clients
  • —A great number of wireless sensors (temperature, humidity, light, movement detection, …)
  • Programmable nodes based SOEKRIS devices and Desktop PCs with multiple Ethernet and wireless interfaces

The control and management of the cloud infrastructure is done through a flexible Management Framework, exploiting Openstack (that is free open source software).  The wireless infrastructure is managed by an open generic governance framework which makes requests to the nodes’ API directly using REST methods, enabling dynamic configuration of resources and reproducibility of experimentation.

SCAN group has developed a mobile cloud infrastructure incorporating a wireless SDN-enabled testbed that features slicing, load balancing, optimum performance, mobility management and seamless handovers, with support for mobile applications. The SCAN infrastructure testbed is deployed at the University campus. Experiments can be conducted by students and other users, through the submission of experiment requirements to the wireless nodes and/or the cloud infrastructure.


The testbed in more detail:

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  • Slice of network resources using a network hypervisor that controls 802.11 infrastructure.
  • Achieve frequency optimum allocation, reduce interference and arrange client distribution by controlling the whole wireless infrastructure.
  • Better QoS for end-users.
  • Allow clients to create and manage access points in order to experiment on a Wireless SDN platform with multiple nodes.


  • 2 Custom access points using Soekris net5501 (433 Mhz CPU, 256 MB SDRAM) with OpenWRT 14.07 (and EmPOWER framework).
  • Multiple SSIDs (operators) per access point. Each using different VLAN.
  • SDN controller deployed on Debian Linux 8 applying different policies per client.
  • Monitor and control the access points remotely from the SDN controller.
  • Monitor and modify basic wireless functions:
    • TX power, Channel allocation, SSIDs/VLANS

SCANlab team is conducting several experiments in the context of the research topics, on which it is currently focusing, such as:

  • Customized radio resources allocations per user.
  • Optimization of overall RR usage between active slices, compared to traditional RR usage over the access points.
  • Interference management between neighboring nodes.
  • Optimized traffic management between APs’ virtual slices – Coordination between APs:
    offloading users to APs’ virtual slices.
  • Mobility management with seamless handovers results in increased Quality of Experience for users.
  • Diversity and dynamicity in policy provision between slices.
  • Energy efficiency – balanced networks using smart user offloading.

The figures below depict some of the sensors (soil moisture, temperature, relative humidity, CO2 and PH sensors) that are deployed in the greenhouse, for the experimentation activities of FIspace and  SmartAgriFood projects.