May 01, 2017

On Active Queue Management in Cellular Networks

  • Beshay J.
  • Francini A.
  • Nasrabadi A.
  • Prakash R.

Active queue management (AQM) is broadly accepted as the tool of choice for tackling bufferbloat (the accumulation of large queueing delays) in network buffers. CoDel and PIE are considered two of the most promising AQM schemes, but little has been done to adopt them in cellular networks, which are particularly plagued by bufferbloat. This is partly due to the lack of adequate evaluation of their performance on links where the data rate varies quickly and widely. Past studies have used simplistic link models and thus do not provide a strong case for the adoption of either scheme in cellular networks. We study the performance of CoDel and PIE on an emulator of recent introduction that accurately reproduces the highly variable nature of cellular links. We discover that both schemes incur link utilization losses up to 60% in return for reducing queueing delay. This trade-off is undesirable for network providers and applications, yet it is inherent to the design of both CoDel and PIE. We argue that AQM schemes designed around the primary goal of maximizing network power (the ratio between throughput and queuing delay) are not the most effective tool for tackling bufferbloat in cellular links. We propose a new queue balance metric as the driving criterion for designing more effective congestion control solutions for cellular networks.

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...