Page 13 - ITUJournal Future and evolving technologies Volume 2 (2021), Issue 1

ITU Journal on Future and Evolving Technologies, Volume 2 (2021), Issue 1

LIST OF ABSTRACTS

Dynamic power control for time-critical networking with heterogeneous traffic
Pages 1–12
Emmanouil Fountoulakis, Nikolaos Pappas, Anthony Ephremides

Future wireless networks will be characterized by heterogeneous traffic requirements. Examples can be
low-latency or minimum-througput requirements. Therefore, the network has to adjust to different
needs. Usually, users with low-latency requirements have to deliver their demand within a specific time
frame, i.e., before a deadline, and they coexist with throughput oriented users. In addition, mobile
devices have a limited-power budget and therefore, a power-efficient scheduling scheme is required by
the network. In this work, we cast a stochastic network optimization problem for minimizing the packet
drop rate while guaranteeing a minimum throughput and taking into account the limited-power
capabilities of the users. We apply tools from Lyapunov optimization theory in order to provide an
algorithm, named Dynamic Power Control (DPC) algorithm, that solves the formulated problem in real
time. It is proved that the DPC algorithm gives a solution arbitrarily close to the optimal one. Simulation
results show that our algorithm outperforms the baseline Largest-Debt-First (LDF) algorithm for short
deadlines and multiple users.

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Reconfiguration algorithms for high precision communications in time sensitive
networks: Time-aware shaper configuration with IEEE 802.1Qcc
Pages 13–34
Ahmed Nasrallah, Venkatraman Balasubramanian, Akhilesh S. Thyagaturu, Martin Reisslein,
Hesham ElBakoury
As new networking paradigms emerge for different networking applications, e.g., cyber-physical
systems, and different services are handled under a converged data link technology, e.g., Ethernet,
certain applications with mission critical traffic cannot coexist on the same physical networking
infrastructure using traditional Ethernet packet-switched networking protocols. The IEEE 802.1Q Time
Sensitive Networking (TSN) Task Group is developing protocol standards to provide deterministic
properties, i.e., eliminates non-deterministic delays, on Ethernet based packet-switched networks. In
particular, the IEEE 802.1Qcc, centralized management and control, and the IEEE 802.1Qbv, Time-
Aware Shaper (TAS), can be used to manage and control Scheduled Traffic (ST) streams with periodic
properties along with Best-Effort (BE) traffic on the same network infrastructure. We investigate the
effects of using the IEEE 802.1Qcc management protocol to accurately and precisely configure TAS
enabled switches (with transmission windows governed by Gate Control Lists (GCLs) with Gate
Control Entries (GCEs)) ensuring ultra-low bounded latency, zero packet loss, and minimal jitter for
ST TSN traffic. We examine both a centralized network/distributed user model (hybrid model) and a
fully-distributed (decentralized) 802.1Qcc model on a typical industrial control network with the goal
of maximizing the number of ST streams.

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