Performance benchmark of transcoding as a virtual network function in CDN as a service slicing

Content delivery networks (CDNs) have been widely implemented to provide scalable cloud services. Such networks support resource pooling by allowing virtual machines to be dynamically running or stopping according to current users' demands. Recently, there has been an increasing interest in Network Function Virtualization (NFV) as an emerging technology that ...

Uplink sounding reference signal coordination to combat pilot contamination in 5G massive MIMO

To guarantee the success of massive multiple-input multiple-output (MIMO), one of the main challenges to solve is the efficient management of pilot contamination. Allocation of fully orthogonal pilot sequences across the network would provide a solution to the problem, but the associated overhead would make this approach infeasible in practical ...

Uplink performance analysis of a drone cell in a random field of ground interferers

Aerial base stations are a promising technology to increase the capabilities of existing communication networks. However, existing analytical frameworks do not sufficiently characterize the impact of ground interferers on aerial base stations. In order to address this issue, we model the effect of interference coming from coexisting ground networks on ...

Hybrid retransmission scheme for QoS-defined 5G ultra-reliable low-latency communications

One of the key challenges in next generation 5G networks is to deliver Ultra-Reliable Low-Latency Communications (URLLC). Recent advances in information theory about principles that govern short packet transmissions pointed out that, for the URLLC typical short packet dimension, achieving higher reliabilities comes at the price of a lower maximum ...

Bankruptcy game based resource allocation algorithm for 5G Cloud-RAN slicing

Recently, network slicing which addresses the deployment of multiple logical networks as independent business operations on a common physical infrastructure has attracted more and more attentions. Despite the advances of network slicing, there are still many open issues regarding the isolation of the wireless slices and resources allocation. The paper ...

Channel measurements and preliminary performance results for indoor time-of-arrival localization

We study the performance of time-of-arrival (ToA) localization for an indoor office environment. We transmit 10MHz and 100MHz waveforms over the 5.8GHz ISM band and measure complex I-Q samples using precisely calibrated and synchronized channel sounding equipment in line-of-sight (LOS) and non- line-of-sight (NLOS) channels. The ToA is estimated using ...

Power Control for Coordinated NOMA Downlink with Cell-Edge Users

Non-orthogonal multiple access (NOMA) is an effective means to improve the spectral efficiency of a wireless communication system. When applied to cellular networks, cell edge users may suffer from low bit rate, or the associated base stations may need to use excessively high power to serve those users. In order ...

Design Principles for Ultra-dense Wi-Fi Deployments

Future indoor networks need to provide broadband services either by increasing bandwidth, higher order modulations and high spatial reuse. To this end, ultra-dense Wi-Fi networks need to be deployed. This work discuss design principles of ultra-dense gigabit Wi-Fi networks through proper bandwidth selection, adaptive CCAs. We present power control management ...

Indoor Localization By Detecting 80 Key Bits With Downlink Interleave Division Multiple Access

In this paper, a wireless cellular network based indoor localization approach is presented. During the training stage, the mobile device initializes a positioning request. The surrounding Base Stations (BSs), which are typically equipped with massive antenna array elements, can measure the Angle of Arrival (AoA) of the positioning request signal. ...

Dynamic Control of RLC Buffer Size for Latency Minimization in Mobile RAN

End-to-end packet latency is a defining component of the Quality of Experience (QoE) delivered to end users by interactive network applications. The tight latency requirements of those applications may be violated when they share packet buffers with elastic applications that use greedy TCP sources for end-to-end transport. The accumulation of ...

Backwards Composite Feedback for Configurable Ultra-Reliability of Retransmission Protocols

Future wireless networks envision ultra-reliable, ultra-low latency communication with efficient use of the limited wireless channel resources. Closed-loop retransmission protocols, such as automatic repeat request (ARQ), where retransmission of a packet is enabled using a feedback channel has been adopted since early days of wireless telecommunication to achieve the required ...

Real world home blood pressure variability in over 56,000 individuals with nearly 17 million measurements

  • Kim K.
  • Nikzad N.
  • Normand A.
  • Quer G.
  • Schmidt N.
  • Steinhubl S.
  • Topol E.
  • Vegreville M.
  • Wineinger N.

© American Journal of Hypertension, Ltd 2017. All rights reserved. BACKGROUND: Using the data from 56,365 individuals, from 185 countries, and a Nokia Health Wireless blood pressure (BP) monitor, we investigated real-world characteristics of BP variability (BPV). METHODS: All included individuals self-measured and uploaded their BP using Bluetooth at least ...

An Enhanced Selected Mapping Technique for Joint PAPR Reduction and Impulsive Noise Suppression in Multi-Carrier Powerline Communications Systems

  • Gacanin H.
  • O. Muta
  • T. Kageyama

In power line communication (PLC) systems using multi-carrier modulation such as orthogonal frequency division multiplexing (OFDM), reduction of peak-to-average power ratio (PAPR) of OFDM signal and mitigation of the influence of impulsive noise are challenging problems. To deal with these problems in PLC-OFDM systems, this paper proposes an enhanced selected ...

Achieving Ultra-Reliable Low-Latency Communications: Challenges and Envisioned System Enhancements

Ultra-reliable low-latency communications (URLLC) have the potential to enable a new range of applications and services: from wireless control and automation in industrial environments, to self-driving vehicles. The fifth generation (5G) wireless systems are faced by different challenges for supporting URLLC. Some of the challenges, particularly in downlink direction, are ...

SDN-based Wi-Fi Direct Clustering for Cloud Access in Campus Networks

  • Hamidouche L.
  • Iskounen S.
  • Mathieu F.
  • Monnet S.
  • Nguyen T.

Mobile cloud is changing the way to enroll teaching activities in university campus. Lectures and lab sessions can be carried out directly from tablets in a class room by accessing a server in the cloud. In this paper, we address the problem of high density cloud access with wireless devices ...

Collaborative Energy and Information Transfer in Green Wireless Sensor Networks for Smart Cities

  • Gong Y.
  • Liu X.
  • Lu W.
  • Peng H.
  • Wu J.

Smart city is able to make the city source and infrastructure more efficiently utilized, which improves the quality of life for citizens. In this framework, wireless sensor networks (WSNs) play an important role to collect, process, and analyze the corresponding information. However, the massive deployment of WSNs consumes a significant ...

Coded Tandem Spreading Multiple Access for Massive Machine-Type Communications

  • Ai B.
  • Chen X.
  • Guan H.
  • Ma G.
  • Wang F.
  • Zhao Z.
  • Zhong Z.

Future IoT applications provoke the connectivity and reliability requirements of machine-type communications, which yield mMTC and URLLC, respectively. In mMTC, grant-free NOMA is adopted to serve massive machine-type devices with low signaling overhead. The challenge of grantfree NOMA for mMTC is the collision induced by non-orthogonal resource allocation. Various grantfree ...

Channel estimation and throughput evaluation for 5G wireless communication systems in various scenarios on high speed railways

  • He R.
  • Wang G.
  • Wang X.
  • Zhao Y.
  • Zhao Z.
  • Zou Y.

The fifth generation (5G) wireless communication is currently a hot research topic and wireless communication systems on high speed railways (HSR) are important applications of 5G technologies. Existing studies about 5G wireless systems on high speed railways (HSR) often utilize ideal channel parameters and are usually based on simple scenarios. ...

Scheduling in multi-wavelength ring-based optical networks-on-chip

Synchronous networks-on-chip (NoC) require tailored schedulers achieving low latency, high throughput, and fairness while avoiding packet collisions. Efficient schedulers exist for rearrangeable non-blocking NoC. However, NoCs fabricated in integrated photonics typically suffer a blocking behavior due to the limitations of the switching capabilities in the space and wavelength domains. This ...

UL SRS Coordination in 5G Massive MIMO Systems

In massive multiple input multiple output (MIMO) systems operating in time division duplex (TDD), users connected to different base stations (BSs) transmit uplink (UL) pilot sequences to allow channel estimation for both UL and downlink (DL) directions. The ongoing standardization activity around the fifth generation (5G) of communication systems is ...