Wireless Software Defined Networks: Challenges and Opportunities

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Wireless Software Defined Networks: Challenges and Opportunities From the 2013 IEEE International Conference on Microwaves, Communications, Antennas and Electronic System(COMCAS 2013) Author(s): Claude Chaudet; Yoram Haddad Telecom ParisTech, Institut Telecom; Jerusalem College of Technology Paris, France; Jerusalem, Israel

Outline Introduction Software Defined Network(SDN) and Openflow Wireless SDN Challenges Slicing and Channels Isolation Monitoring and Status Report Handoffs Wireless SDN Opportunities Improving end-user connectivity and QoS Multi-network planning Security Localization Conclusion Reference

Introduction Wired networks – cables, complexity Wireless networks – data rate, services Software Defined Radio(SDR) Spectral efficiency – two strategies Close access points limits optimization possibilities Software Defined Network(SDN)

SDN Control plane and forwarding plane Controller Centralized management Controller NOX, POX Span across multiple LANs.

FlowVisor – slicing Wireless SDN Time required

Wireless SDN Challenges Slicing and Channels Isolation Wireless FlowVisor management Defining more slices than the number of channels defined by the technology is possible. Time division multiplexing Frequency division multiplexing

Monitoring and Status Report Report the status Two non-trivial aspects Estimating the different wireless channels status Topology discovery Control And Provisioning of Wireless Access Points(CAPWAP) The channels load is quite difficult to estimate Identifying the local topology surrounding a node is important

Handoffs Manage multiple handoff situations Homogeneous Heterogeneous Seamless handoff between service providers is trickier

Wireless SDN Opportunities Improving end-user connectivity and QoS Exchange enough information Load balancing security and access control problems Controller could be defined in each geographic area With appropriate statistics sent by multiple controllers

Multi-network planning Create zone-specific controllers Reducing interferences and power Access points usually dispose of a limited number of transmission power levels n access point disposes of k power levels Requires n．k messages emissions Controller needs to compare k^n situations Capacity increase suddenly ISP SDN

Security Localization Reaction can be uploaded in the form of a simple rule by the controller in all managed nodes Localization Controller collecting information form several access points

Conclusion Letting operators or ISPs collaborate and exchange status information Commercial issues Privacy issues Topography Cost

Reference http://www.noxrepo.org/ http://thesis.lib.ncu.edu.tw/ETD-db/ETD-search/getfile?URN=995302024&filename=995302024.pdf P. Dely, A. Kassler, and N. Bayer. Openflow for wireless mesh networks. In 20th International Conference on Computer Communications and Networks (ICCCN), Aug. 2011.