WOS2 – Latency and reliability in wireless networks

Tuesday, 19 June 2018, 16:30-18:00, E4 hall
Session chair: Lena Wosinska (KTH Royal Institute of Technology, Sweden)

16:30 – MEC-assisted End-to-End Latency Evaluations for C-V2X Communications

Mustafa Emara (Intel Deutschland GmbH & Hamburg University of Technology, Germany); Miltiades C. Filippou (Intel Germany GmbH, Germany); Dario Sabella (Intel, Germany)
The efficient design of fifth generation (5G) mobile networks is driven by the need to support the dynamic proliferation of several vertical market segments. Considering the automotive sector, different Cellular Vehicle-to-Everything (C-V2X) use cases have been identified by the industrial and research world, referring to infotainment, automated driving and road safety. A common characteristic of these use cases is the need to exploit collective awareness of the road environment towards satisfying performance requirements. One of these requirements is the End-to-End (E2E) latency when, for instance, Vulnerable Road Users (VRUs) inform vehicles about their status (e.g., location) and activity, assisted by the cellular network. In this paper, focusing on a freeway-based VRU scenario, we argue that, in contrast to conventional, remote cloud-based cellular architecture, the deployment of Multi-access Edge Computing (MEC) infrastructure can substantially prune the E2E communication latency. Our argument is supported by an extensive simulation-based performance comparison between the conventional and the MEC-assisted network architecture.



16:48 – Asymmetric ACK/NACK Detection for Ultra-Reliable Low-Latency Communications

Hamidreza Shariatmadari and Ruifeng Duan (Aalto University, Finland); Sassan Iraji (Intel, Germany); Riku Jäntti (Aalto University School of Electrical Engineering, Finland); Zexian Li and Mikko Uusitalo (Nokia Bell Labs, Finland)
The fifth generation wireless systems are expected to encounter new services in order to provide connectivity for a wide range of applications. One of the considered services is ultra-reliable low-latency communications (URLLC), which has stringent requirements on availability, reliability, and latency. The communication efficiency of URLLC can be improved by employing error control protocols, such as automatic repeat request (ARQ) and hybrid ARQ (HARQ). However, this requires a reliable feedback channel to carry acknowledgement (ACK) and negative ACK (NACK) signals. Improving the detection reliability of ACK and NACK signals simultaneously entails allocating more resources for the feedback channel, which can reduce the communication efficiency. Instead, we propose employing an asymmetric signal to provide a better protection for NACK signals compared to the ACK signals, without assigning more resources to the feedback channel. The simulation results show that the asymmetric signal detection can achieve a better resource utilization for URLLC.



17:06 – Handling Delay in 5G Ethernet Mobile Fronthaul Networks

Steinar Bjornstad (NTNU, Norway); David T Chen (Nokia, USA); Raimena Veisllari (TransPacket AS, Norway)
In this paper we discuss how to handle delay in 5G Ethernet mobile fronthaul networks. The reasons for the delay requirements, addressing both service and protocol specific requirements, are discussed together with prime carrier needs of scalability of networks and easy migration to new network solutions. In light of these carrier needs, we also examine the suitability of different packet switching mechanisms for Time Sensitive Networks (TSN) proposed in scientific literature and standardization.



17:24 – Latency Aware NOMA Based Device-to-Device Communication

Bilge Kartal (Ege University, Turkey); Nuno K Pratas (Intel Mobile Communications, Denmark)
Device to Device (D2D) links in cellular networks envisioned as a promising technique to satisfy the increasing demand of local traffic load. This technique aims to admit more users into the network, thereby it provides spectral gain for traditional cellular communication. In this paper, we study latency-aware resource allocation problem for the cellular networks in which cellular devices in proximity communicate with each other without going through the base station. We consider D2D underlying cellular uplink where one cellular user and a group of D2D candidate users exist. Based on the channel state and latency restriction, one of the D2D user are chosen to share the channel with the cellular user in non-orthogonal multiple access (NOMA) fashion. We formulate the problem as a mixed integer nonlinear programming where the sum data rate is maximized subject to interference and latency restrictions. Then we evaluate the performance in terms of latency and throughput for different implementation strategies of D2D communication in a single cell scenario .


17:42 – Assessment of the Suitability of NB-IoT Technology for ORM in Smart Grids

Varun Nair (TU Delft, The Netherlands); Remco Litjens (TNO, The Netherlands); Haibin Zhang (TNO ICT, The Netherlands)
In this paper, we assess the suitability of NB-IoT (Narrowband Internet of Things) cellular technology for smart grid applications, concentrating on the reliable and timely delivery of Outage Restoration & Management (ORM) messages at the event of a local or regional power outage. Using system-level simulations modelling of both the cellular NB-IoT and the energy distribution networks for different environments, we present an extensive sensitivity analysis of the ORM service performance w.r.t. various radio network configurations. In particular, we propose and analyze different packet schedulers, an essential mechanism in optimizing the service performance. A key outcome of the study is the conclusion that indeed NB-IoT is a suitable technology for supporting ORM services in smart grids, accompanied with a proposed near-optimal radio network configuration to best do so.