August 12, 2016

Coding for caching: fundamental limits and practical challenges

  • Maddah-Ali M.
  • Niesen U.

Caching is an essential technique to improve throughput and latency in a vast variety of applications. The core idea is to duplicate content in memories distributed across the network, which can then be exploited to deliver requested content with less congestion and delay. The traditional role of cache memories is to deliver the maximal amount of requested content locally rather than from a remote server. While this approach is optimal for single-cache systems, it has recently been shown to be significantly suboptimal for systems with multiple caches (i.e., cache networks). Instead, cache memories should be used to enable a coded multicasting gain. In this article, we survey these recent developments. We discuss both the fundamental performance limits of cache networks and the practical challenges that need to be overcome in real-life scenarios.

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Recent Publications

August 28, 2024

Hybrid GMM-UBM and SVM based systems for text-independent speaker verification in noisy environment

  • Carvalho D.
  • Cavalcanti G.
  • Pinheiro H.
  • Sijbers J.
  • Tsang I.
  • Tsang I.

This paper proposes a hybrid Gaussian Mixture Model-Universal Background Model (GMM-UBM) based speaker verification system for mobile devices in variable noisy environments. We applied a Support Vector Machine (SVM) classier in two GMM-UBM based text-independent speaker verification systems to improve the performance. In the first system, both hypothesized speaker and ...

May 22, 2020

Energy Savings in LTE Macro Base Stations

  • Ambrosy A.
  • Blume O.
  • Ferling D.
  • Jueschke P.
  • Wilhelm M.
  • Yu X.

In wireless access networks the traffic load varies strongly along a day and efficient concepts to adapt the power consumption of LTE macro base stations to the required traffic load are currently widely under study. Significant daily energy savings up to 35% can be achieved for different deployment scenarios by ...

February 19, 2017

Enhancing Mobile Networks with Software Defined Networking and Cloud Computing

  • Cao Z.
  • Kodialam M.
  • Lakshman T.
  • Panwar S.

In the past decade, mobile devices and applications have experienced an explosive growth, and users are expecting higher data rates and better quality services every year. In this paper, we propose several ideas to increase wireless network functionality and capacity using software-defined networking and cloud computing. Connections in mobile networks ...