Monthly Newsletter from CNI

Issue - October 2023


Upcoming talks

Providing High Reliability in the Google Global Network:

Google owns and operates one of the world's largest networks, supporting billions of users (Search, YouTube,Gmail, Maps, Cloud). In this talk, Dr. Ranjita Bhagwan, Principal Engineer at Google, will be describing the challenges and techniques in ensuring reliability for such large scale networks with diverse requirements.

What’s cooking at the CNI ?

Flexible Mixed Numerology OFDM Physical Layer for 5G New Radio

This is a recent work by Neelesh Mehta and Tenneti Venkata Satya Sreedhar . Check out their paper here to learn more.

Mixed numerology was introduced in the physical layer of the 5G New Radio standard to give it the flexibility needed to serve diverse use cases and services such as enhanced mobile broadband, massive machine-type communications, and ultra-reliable low latency communications. It is inherently well-suited for supporting network slicing. The subcarriers of different numerologies have different bandwidths and symbol durations. As a result, they interfere with each other despite being centered at different frequencies. We have developed a novel analysis of the inter-numerology interference (INI) power that arises in these systems. Our comprehensive model accounts for the wideband, time-varying nature of the channels seen by 5G deployments, and the presence of phase noise, which is a serious impediment at millimeter-wave frequencies. It applies to the entire family of numerologies of 5G NR, and accounts for partial subcarrier loading, guard bands, and non-line-of-sight and line-of-sight channels. We also propose a novel statistical square root power allocation scheme that exploits the variation in the average INI powers across the subcarriers to mitigate the impact of INI.

Low latency access of replicated fragments on memory constrained servers

CNI Convener, Parimal Parag was invited to talk about his work with R. Jinan, A. Badita, P. K. Sarvepalli on Low latency access of replicated fragments on memory constrained servers at IIT Delhi, IIIT Delhi and Shiv Nadar University, Delhi NCR. Check out the slides to learn more!


The 35th ITC Conference, the international flagship congress in the field of networking science and practice is happening on 3 - 5 October 2023 at Politecnico di Torino, Italy.  

CNI PhD fellow Ankita Koley presented her joint work with Chandramani Singh on Optimal Resource Management for Multi-access Edge Computing without using Cross-layer Communication.  

Ashok Krishnan gave an invited talk based on a recent journal paper titled Optimal pricing in a single server system (ACM Transactions on Modelling and Performance Evaluation of Computing Systems). This is joint work with Chandramani. K. Singh, Siva Theja Maguluri and Parimal Parag.


Past Events

Programmable Networks: Hardware, Software, and Applications | Prof. Anirudh Sivaraman

Prof. Anirudh Sivaraman presented a talk titled Programmable Networks: Hardware, Software, and Applications. Traditionally, networks have been responsible for simply delivering packets from one location to another. However, their research vision is to make networks programmable, allowing to actively transform packets while they are in transit. This shift envisions programmability as a standard feature of networks, like the connectivity we take for granted today. He then discussed three key research projects: Menshen, CaT and Chipmunk, and Deadline-ordered multicast (DOM), each contributing to this vision in several ways. Check out the talk to learn more!

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