March 20, 2017

Low-Latency Communications in LTE Using Spatial Diversity and Encoding Redundancy

  • Claussen H.
  • Kucera S.
  • Yu Yu
  • Yuto Lim

Control of data delivery latency in wireless mobile networks is an open problem due to the inherently unreliable and stochastic nature of wireless channels. This paper explores how the current best-effort throughput-oriented wireless services could be evolved into latency-sensitive enablers of new mobile applications such as remote 3D graphical rendering for interactive virtual/augmented-reality overlay. Assuming that the signal propagation delay and achievable throughput meet the basic latency requirements of the user application, we examine the idea of trading excess/federated bandwidth for the elimination of non-negligible data re-ordering delays, caused by temporal transmission failures and buffer overflows. The general system design is based on (i) spatially diverse data delivery over multiple paths with uncorrelated outage likelihoods, and (ii) packet-level forward error correction, creating encoding redundancy for proactive recovery of intolerably delayed data without end-to-end re-transmissions. Performance evaluation and analysis is based on traces of real-life traffic in live carrier-grade LTE networks.

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April 12, 2017

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The achievable information rate is experimentally estimated in coherent fiber optical communication for different four dimensional descriptions of the channel to the demapper. Polarization-multiplexed 16-ary quadrature amplitude modulation with channel symbolrates of either 10 or 20 Gbaud are investigated in experiments over both erbium doped fiber amplifier based links and ...

April 12, 2017

Uplink Performance Analysis of Dense Cellular Networks With LoS and NLoS Transmissions

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In this paper, we analyse the coverage probability and the area spectral efficiency (ASE) for the uplink (UL) of dense small cell networks (SCNs) considering a practical path loss model incorporating both line-of-sight (LoS) and non-line-of-sight (NLoS) transmissions. Compared with the existing work, we adopt the following novel approaches in ...

April 12, 2017

From Scaling Disparities to Integrated Parallelism: A Decathlon for a Decade

  • Neilson D.
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Based on a variety of long-term network traffic data across different geographies and applications as well as long-term scaling trends of key information and communication technologies, we identify fundamental scaling disparities between technologies used to generate and process data and technologies used to transport data. These disparities could lead to ...