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1. Programmable optical x-haul network in the COSMOS testbed

   Gutterman, Craig ; Minakhmetov, Artur ; Yu, Jiakai ; Sherman, Michael ; Chenm, Tingjun ; Zhu, Shengxiang ; Seskar, Ivan ; Raychaudhuri, Dipankar ; Kilper, Daniel ; Zussman, Gil ( January 2019 , 2019 IEEE 27th International Conference on Network Protocols (ICNP))

   Abstract—The Cloud-Enhanced Open Software Defined Mobile Wireless Testbed for City-Scale Deployment (COSMOS) platform is a programmable city-scale shared multi-user advanced wireless testbed that is being deployed in West Harlem of New York City [1]. To keep pace with the significantly increased wireless link bandwidth and to effectively integrate the emerging C-RANs, COSMOS is designed to incorporate a fast programmable core network for providing connections across different computing layers. A key feature of COSMOS is its dark fiber based optical x-haul network that enables both highly flexible, user defined network topologies and experimentation directly in the optical physical layer. The optical architecture of COSMOS was presented in [2]. In this abstract, we present the tools and services designed to configure and monitor the performance of optical paths and topologies of the COSMOS testbed. In particular, we present the SDN framework that allows testbed users to implement experiments with application-driven control of optical and data networking functionalities. 

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2. COSMOS: Optical Architecture and Prototyping

   Gutterman, Craig ; Minakhmetov, Artur ; Yu, Jiakai ; Chen, Tingjun ; Zhu, Shengxiang ; Zussman, Gil ; Seskar, Ivan ; Raychaudhuri, Dipankar ; Kilper, Dan ( January 2019 , ACM SIGCOMM 2019 Workshop on Optical Systems Design)

   ABSTRACT The Cloud Enhanced Open Software Defined Mobile Wireless Testbed for City-Scale Deployment (COSMOS) platform is a programmable city-scale shared multiuser advanced wireless testbed that is being deployed in New York City [1]. Open APIs and programmability across all the technology components and protocol layers in COSMOS will enable researchers to explore 5G technologies in a real world environment. A key feature of COSMOS is its dark fiber based optical x-haul network that enables both highly flexible, user defined network topologies as well as experimentation directly in the optical physical layer. A paper on the COSMOS optical architecture was previously presented in [2]. In this talk, we briefly introduce COSMOS’ optical x-haul network with SDN control, and its integration with the software-defined radio (SDR) and mobile edge cloud. 

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3. Challenge: COSMOS: A city-scale programmable testbed for experimentation with advanced wireless

   Raychaudhuri, D ; Seskar, I. ; Zussman, G. ; Korakis, T. ; Kilper, D. ; Chen, T. ; Kolodziejski, J. ; Sherman, M. ; Kostic, Z. ; Gu, X. ; et al ( January 2020 , ACM MobiCom '20)

   This paper focuses on COSMOS ś Cloud enhanced Open Software defined MObile wireless testbed for city-Scale deployment. The COSMOS testbed is being deployed in West Harlem (New York City) as part of the NSF Platforms for Advanced Wireless Research (PAWR) program. It will enable researchers to explore the technology łsweet spotž of ultra-high bandwidth and ultra-low latency in the most demanding real-world environment. We describe the testbed’s architecture, the design and deployment challenges, and the experience gained during the design and pilot deployment. Specifically, we describe COSMOS’ computing and network architectures, the critical building blocks, and its programmability at different layers. The building blocks include software-defined radios, 28 GHz millimeter-wave phased array modules, optical transport network, core and edge cloud, and control and management software. We describe COSMOS’ deployment phases in a dense urban environment, the research areas that could be studied in the testbed, and specific example experiments. Finally, we discuss our experience with using COSMOS as an educational tool. 

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4. Open-Access Full-Duplex Wireless in the ORBIT and COSMOS Testbeds

   https://doi.org/10.1145/3411276.3412185  

   Kohli, Manav ; Chen, Tingjun ; Dastjerdi, Mahmood Baraani ; Welles, Jackson ; Seskar, Ivan ; Krishnaswamy, Harish ; Zussman, Gil ( September 2020 , in Proc. ACM MobiCom'20 Workshop on Wireless Network Testbeds, Experimental evaluation & Characterization (WiNTECH))

   null (Ed.)

   ABSTRACT In order to support experimentation with full-duplex (FD) wireless, we recently integrated two generations of FD radios in the open-access ORBIT and COSMOS testbeds. First, we integrated a customized 1st generation (Gen-1) narrowband FD radio in the indoor ORBIT testbed. Then, we integrated two 2 nd generation (Gen-2) wideband FD radios in the city-scale PAWR COSMOS testbed. Each integrated FD radio consists of an antenna, a customized RF self-interference (SI) canceller box, a USRP software-defined radio (SDR), and a remotely accessible compute node. The Gen-1/Gen-2 RF SI canceller box includes an RF canceller printed circuit board (PCB) which emulates a customized integrated circuit (IC) RF canceller implementation. The amplitude- and phase-based Gen-1 narrowband RF canceller achieves 40 dB RF SIC across 5 MHz. The Gen-2 wideband canceller is based on the technique of frequency-domain equalization (FDE) and achieves 50 dB RF SI cancellation (SIC) across 20 MHz. In this paper, we present the design and testbed integration of the two generations of FD radios. We then present example experiments that can be remotely run and modified by experimenters. Finally, we discuss future improvements and potential FD wireless experiments that can be supported by these open-access FD radios integrated in the COSMOS testbed. 

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5. COSMOS educational toolkit: using experimental wireless networking to enhance middle/high school STEM education

   https://doi.org/10.1145/3431832.3431839  

   Skrimponis, Panagiotis ; Makris, Nikos ; Rajguru, Sheila Borges ; Cheng, Karen ; Ostrometzky, Jonatan ; Ford, Emily ; Kostic, Zoran ; Zussman, Gil ; Korakis, Thanasis ( October 2020 , ACM SIGCOMM Computer Communication Review)

   null (Ed.)

   This paper focuses on the K-12 educational activities of COSMOS-Cloud enhanced Open Software defined MObile wireless testbed for city-Scale deployment. The COSMOS wireless reasearch testbed is being deployed in West Harlem (New York City) as part of the NSF Platforms for Advanced Wireless Research (PAWR) program. COSMOS' approach for K-12 education is twofold: (i) create an innovative and concrete set of methods/tools that allow teaching STEM subjects using live experiments related to wireless networks/IoT/cloud, and (ii) enhance the professional development (PD) of K-12 teachers and collaborate with them to create hands-on educational material for the students. The COSMOS team has already conducted successful pilot summer programs for middle and high school STEM teachers, where the team worked with the teachers and jointly developed innovative real-world experiments that were organized as automated and repeatable math, science, and computer science labs to be used in the classroom. The labs run on the COSMOS Educational Toolkit, a hardware and software system that offers a large variety of pre-orchestrated K-12 educational labs. The software executes and manages the experiments in the same operational philosophy as the COSMOS testbed. Specifically, since it is designed for use by non-technical middle and high school teachers/students, it adds easy-to-use enhancements to the experiments' execution and the results visualization. The labs are also supported by Next Generation Science Standards (NGSS)-compliant teacher/student material. This paper describes the teachers' PD program, the NGSS lessons created and the hardware and software system developed to support the initiative. Additionally, it provides an evaluation of the PD approach as well as the expected impact to K-12 STEM education. Current limitations and future work are also included as part of the discussion section. 

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