Joint Channel Access Mechanism and Scheduling Design and for Licensed Assisted Access System

We consider an Uplink License Assisted Access (LAA) system in which LTE systems compete transmission resources with WiFi systems. Before sending any signals, a listen-before-talk (LBT) process is mandated for LAA system: users are required to sense the environment and can only transmit if the channel is considered idle. To guarantee that all users are aligned for transmission, a designation period of time, referred as the LBT gap is designed at the beginning of each subframe. We proposed a mechanism to calculate the optimal length of this LBT gap based on the condition of the environment, the payload size and the LBT process counter size for each individual user. The proposed mechanism can achieve a balance between the probability of successful transmission and the efficiency of using the resource. With an optimized LBT gap, we further incorporate the probability of successful transmission into the multi-user scheduling algorithm design. Our simulation results show that the mechanism of deciding the optimal LBT gap and the corresponding scheduling algorithm can significantly improve the throughput of LTE system and reduce the delay of end-to-end transmission delay.

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 ...