Optical-Wireless x-Hual Networking

An optical-wireless x-haul experiment has been developed to demonstrate the C-RAN architecture and its integration with the optical x-haul network and SDN control. In particular, the wideband FD radio serves as an FD base station (BS) located at the large node. The FD BS sends baseband IQ data through the core optical switching at the Columbia data center to the colocation side at 32 Avenue of the Americas. It is then sent back to the data center at Columbia for digital signal processing using NI LabVIEW. Simultaneously, a video multicast application operates on the x-haul network on a different optical wavelength. The access point (AP), which needs to dynamically adapt to the channel conditions of several users, receives video streams from two servers through on-demand optical switching managed by a Ryu-based SDN controller. One is received through the short green route (<1 mile distance), and other through the long red route (~14 miles distance). The experiment evaluates the ability of the multicast application to switch between a local and remote cloud servers (via optical support) while responding to the users’ channel states.

Figure 1. (a) Example of optical x-haul network topologies that can be created by COSMOS' optical transport network with SDN control, and (b) the optical paths in an example optical-wireless x-haul experiment.
[1] T. Chen, J. Yu, A. Minakhmetov, C. Gutterman, M. Sherman, S. Zhu, S. Santaniello, A. Biswas, I. Seskar, G. Zussman, and D. Kilper, “A software-defined programmable testbed for beyond-5G optical-wireless experimentation at city-scale”, IEEE Network, Special Issue on Next-Generation Optical Access Networks to Support Super-Broadband Services and 5G/6G Mobile Networks, vol. 36, no. 2, pp. 90-99, Mar./Apr. 2022. [download]
[2] B. Lantz, J. Yu, A. Bhardwaj, A. Diaz-Montiel, A. Quraishy, S. Santaniello, T. Chen, R. Fujieda, A. Mukhopadhyay, G. Zussman, M. Ruffini, and D. Kilper, “SDN-controlled dynamic front-haul provisioning, emulated on hardware and virtual COSMOS optical x-haul testbeds,” in Proc. OSA OFC’21, 2021.  [download] [presentation] [demo video]
[3] A. Minakhmetov, C. Gutterman, T. Chen, J. Yu, C. Ware, L. Iannone, D. Kilper, and G. Zussman, “Experiments on cloud-RAN wireless handover using optical switching in a dense urban testbed,” in Proc. OSA OFC’20, Th2A.25, 2020. [download]
[4] J. Yu, C. Gutterman, A. Minakhmetov, M. Sherman, T. Chen, S. Zhu, G. Zussman, I. Seskar, and D. Kilper, “Dual use SDN controller for management and experimentation in a field deployed testbed,” in Proc. OSA OFC’20, T3J.3, 2020. [download]

[5] K. Guan, J. E. Simsarian, F. Boitier, D. Kilper, J. Pesic, and M. Sherman, “Efficient Classification of Polarization Events Based on Field Measurements”, Proc. OSA OFC’20, Th3D.7, Mar. 2020 [download]

[6] C. Gutterman, A. Minakhmetov, J. Yu, M. Sherman, T. Chen, S. Zhu, I. Seskar, D. Raychaudhuri, D. Kilper, and G. Zussman, “Programmable optical x-haul network in the COSMOS testbed,” in Proc. IEEE ICNP’19 Workshop Midscale Education and Research Infrastructure and Tools (MERIT), 2019. [download]

[7] J. Yu, T. Chen, C. Gutterman, S. Zhu, G. Zussman, I. Seskar, and D. Kilper, “COSMOS: Optical architecture and prototyping,” in Proc. OSA OFC’19, M3G.3 (invited), 2019. [download] [slides]