SOFTWARE DEFINED IOT NETWORKING in IoT

* SDN is useful to manage and control IoT network
* Wirless sensor nodes (WSN) and network can be controlled using SDN-based applications.
* Network performance can be improved significantly using SDN-based approaches over the traditional approaches.

Benefits of Integrating SDN

Intelligence routing decisions can be deployed using SDN
Simplification of information collection, analysis and decision making
Visibility of network resources - network management is simplified based on user, device and application - specific requirements
Intelligent traffic pattern analysis and coordinated decision

SDN for IoT

Constrained Node Networks → Control of end-devices, such as sensors and actuators

Intelligent Aggregation → Rule - placement at access devices, while considering mobility and heterogeneity of end-users

Transport Network → Rule - placement and traffic engineering at backbone networks

IoT Cloud → Flow classification and enhanced security at data center networks

Wireless Sensor Network 1

Challenges

Real-time programming of sensor nodes
Vendor-specific architecture
Resource constrained - heavy computation cannot be performed
Limited memory - cannot insert too many control programs

Wireless Sensor Network 11

Opportunities

Can we program the sensor nodes in real-time?
Can we change the forwarding path in real-time?
Can we integrate different sensor nodes in a WSN?

Software-Defined WSN 1

Sensor OpenFlow (Lup et al., IEEE Comm. Letters '12)
→ Value-centric data foewarding

Forward the sensed data if exceeds a certain value

→ ID-centric data forwarding

Forward the sensed data based on the ID of the source node

Real-life implementation of such method NOT done

Software-Defined WSN 11

Soft-WSN (Bera et al., IEEE DJ '16)
* Sensor Device Management
→ Sensor management

Multiple sensors can be implemented in a single sensor board
Sensors can be used depending on application-specific requirements

→ Delay management

Delay for sensing can be changed dynamically in real-time

→ Active-Sleep Management

States of active and sleep mode can be changed dynamically

Software-Defined WSN 111

Soft-WSN

Topology Management
- Node-specific management - forwarding logic of a particular sensor can be modified
- Network-specific management

Forward all traffic of a node in the network
Drop all traffic of a node in the network

Experimental results show that network performance can be improved using software-defined WSN over traditional WSN

Soft-WSN: Result 1

Packet delivery ratio in the network increases using Soft-WSN compared to the traditional WSN.

Soft-WSN: Result 11

Number of replicated data packets is reduced using Soft-WSN over the traditional WSN.

Soft-WSN: Result 111

Number of control messages in the network is higher using Soft-WSN over the traditional WSN. This is due to the PACKET-IN message in the network. Each time a node receives a new packet, it asks the controller for getting adequate forwarding logic.

SDN-WISE Protocol Stack

Sensor node includes