• Wednesday, 14 June, 11:00-12:30, Room Theatre Attic Studio
  • Session Chair: Petri Komulainen (MediaTek, Finland)



11:00 Multi-core Fiber Undersea Transmission Systems

Md. Nooruzzaman and Toshio Morioka (Technical University of Denmark, Denmark)

Various potential architectures of branching units for multi-core fiber undersea transmission systems are presented. It is also investigated how different architectures of branching unit influence the number of fibers and those of inline components.


11:18 Outage Probability Analysis in Finite Wireless Networks Operating in LOS Environment

Natalia Ermolova (Aalto University, Finland)

In this work, we analyze the outage probability in finite wireless networks operating in line-of-sight (LOS) environment with a given statistical distribution of transmitter-receiver distance. To generalize our analysis, we use a recently proposed beta distribution as a substitute to real distance distributions in finite random networks [1]. Generalized Rician fading distribution and path-loss effects are taken into consideration. Moreover, we also analyze effects of possibly different path-loss attenuation of LOS and non-LOS signal components [2]-[3].


11:36 Scheduling in an Ethernet Fronthaul Network

Mohamad Kenan Al-Hares (University of Kent, United Kingdom (Great Britain)); Philippos Assimakopoulos (University of Kent & Communications Research group, United Kingdom (Great Britain)); Daniel Muench (ADVA Optical Networking SE, Germany); Nathan J Gomes (University of Kent, United Kingdom (Great Britain))

This paper investigates and compares the performance of different scheduling techniques in an Ethernet fronthaul network in the presence of both time-sensitive/high priority and background traffic streams. A switched Ethernet architecture is used as the fronthaul section of a cloud radio access network (C-RAN) and a comparison of two scheduling schemes, strict priority scheduling and time-aware shaping, is carried out. The different streams are logically separated using virtual local area network identifiers and contend for the use of trunk links formed between aggregator/switch nodes. The scheduling schemes are applied in the access and trunk ports in the fronthaul, and need to handle the queue management and prioritization of the different streams. In such cases, contention-induced latency variation has to be characterized, especially when the fronthaul transports precision time protocol traffic, as it directly leads to errors in timestamping. OPNET models for strict priority and time-aware schedulers have been built and employed, and simulation results are used to compare the performance of the two scheduling schemes.


11:54 On the Optimal Space-Frequency to Frequency Mapping in Indoor Single-Pair RoC Fronthaul

Andrea Matera and Umberto Spagnolini (Politecnico di Milano, Italy)

Centralized Radio Access Network (C-RAN) architecture is the enabling technology for the deployment of massive number of antennas essential to meet the requirements of next generation (5G and beyond) mobile systems. In C-RAN the fronthaul links between processing Base Band Units (BBUs) and Remote Antenna Units (RAUs) are conventionally based on fiber optic, although its deployment cost can be excessive. Radio over Copper (RoC) is an alternative/complementary technology for the fronthauling especially suitable for self-powered indoor deployment since it leverages on the pre-existing LAN cables. In this paper we consider a RoC C-RAN architecture as a low-cost bandwidth-efficient in-building solution to guarantee enhanced indoor coverage as required by 5G and beyond mobile systems. In particular, the focus of the paper is to gain insights into the optimal resource allocation to/from the RAU equipped with multiple antennas or multiple radios (e.g., 5G and WiFi) and the cable resources to fully exploit the capabilities of the twisted-pair cable over the last 50-100m. Numerical results validate the proposed method considering a realistic radio environment where the performance of indoor users are impaired by the interference of outdoor non-cooperating cells.


12:12 Adaptive In-band Full-Duplex Collision Detection for Balancing Sensing and Collision Costs

Brecht Reynders, Tom Vermeulen, Fernando Rosas and Sofie Pollin (KU Leuven, Belgium)

An undesirable side-effect of network densification is a reduced quality of service due to increased contention. One interesting solution to address this issue is full-duplex medium access control (MAC) with collision detection. By detecting collisions early on, a considerable amount of energy can be saved in dense networks. However, when traffic demand and, as a result, the collision rate decrease, the reduced collision time does not compensate for the increased power consumption of the full-duplex physical layer. This paper therefore investigates the trade-offs between two MAC protocols (i.e. full-duplex CSMA/CD and half-duplex CSMA/CA) proposing closed-form formulas to calculate the equilibrium point in terms of power consumption. Knowing this equilibrium, we propose a distributed algorithm that independently switches the MAC protocol of each node reducing the energy consumption of each node up to 33%.