PHY6 – Emerging Use Cases
Wednesday, 5 June 2024, 16:00-17:30, room Toucan 2
Session Chair: Ahmad Nimr (Technische Universität Dresden, DE)
Emerging Advancements in 6G NTN Radio Access Technologies: An Overview
Husnain Shahid (Centre Tecnologic de Telecomunicacions de Catalunya -CTTC, Spain); Carla Amatetti and Riccardo Campana (University of Bologna, Italy); Sorya Tong (Thales SIX GTS, France); Dorin Panaitopol (THALES SIX GTS France, France); Alessandro Vanelli-Coralli (University of Bologna, Italy); Abdelhamed Mohamed (Orange, France); Chao Zhang (Ericsson, United Kingdom (Great Britain)); Ebraam Ebraam Khalifa (Qualcomm, France); Eduardo Medeiros (Ericsson, Sweden); Estefania Recayte (German Aerospace Center – DLR, Germany); Fatemeh Ghasemifard (Ericsson AB, Sweden); Ji Lianghai (Qualcomm Technologies, Inc., USA); Juan Bucheli (Qualcomm & Qualcomm, France); Karthik Anantha Swamy (Qualcomm Technologies Inc., USA); Marius Caus (CTTC, Spain); Mehmet Gurelli (Qualcomm, USA); Miguel Angel Ángel Vazquez (CTTC, Spain); Musbah Shaat (Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) / CERCA, Spain); Nathan Borios (Thales Alenia Space, France); Per-Erik Eriksson (Ericsson Research, Sweden); Sebastian Euler (Ericsson, Sweden); Zheng Li (CentraleSupelec, France); Xiaotian Fu (Ericsson, France)
The efforts on the development, standardization and improvements to communication systems towards 5G Advanced and 6G are on track to provide benefits such as an unprecedented level of connectivity and performance, enabling a diverse range of vertical services. The full integration of non-terrestrial components into 6G plays a pivotal role in realizing this paradigm shift towards ubiquitous communication and global coverage. However, this integration into 6G brings forth a set of its own challenges, particularly in Radio Access Technologies (RATs). To this end, this paper comprehensively discusses those challenges at different levels of RATs and proposes the corresponding potential emerging advancements in the realm of 6G NTN. In particular, the focus is on advancing the prospective aspects of Radio Resource Management (RRM), spectral coexistence in terrestrial and non-terrestrial components and flexible waveform design solutions to combat the impediments. This discussion with a specific focus on emerging advancements in 6G NTN RATs is critical for shaping the next generation networks and potentially relevant in contributing the part in standardization in forthcoming releases.
Receiver Metric Design for Short-Block Channels: A Perspective for Reliable 6G Signalling Scenarios
Mody Sy (EURECOM, France); Raymond Knopp (Institut Eurecom, France)
This paper presents Bit-Interleaved Coded Mod- ulation metrics for joint estimation detection in short block length channels. We showcase performance enhancements for advanced receivers, particularly in scenarios with unknown channel state information and low training dimension density. Our analysis employs a full 5G transceiver chain for Polar and LDPC coded transmissions with QPSK modulation. We consider transmissions where reference signals are interleaved with data and both are transmitted over a small number of OFDM symbols so that near-perfect channel estimation cannot be achieved. This is particularly adapted to mini-slot transmissions for ultra-reliable, low-latency communications. We characterize the performance for up to SIMO and spatially multiplexed SU- MIMO transmission configurations in order to determine the performance gain offered by the proposed BICM detection in realistic base station receiver scenarios. Results demonstrate that when the detection windows used in the metric units is on the order of four modulated symbols the proposed BICM metrics can be used to achieve detection performance that is close to that of a coherent receiver with perfect channel state information for both polar and LDPC coded configurations.
Closed-Loop Binary Media-Based Modulation
Majid Nasiri Khormuji and Branislav M. Popovic (Huawei Technologies Sweden AB, Sweden)
Presenting analytical results for Binary Media Based Modulation (B MBM) over fading channels for single-antenna receivers. Illustrating that open loop B MBM, in the absence of feedback, only achieves a diversity order of one. However, with feedback and optimal weight selection in closed loop configurations, a diversity order of two becomes achievable. Notably, the closed loop B-MBM, with analytically computed optimal weights, performs equivalent to Alamouti coded BPSK transmission, demonstrating feasibility even with just one radio frequency chain when feedback is available. Index terms relevant to the paper include: Binary Shift Key Modulation, Binary Media Based Modulation, Feedback, Diversity Coding, RF Mirrors, and 6G.
Performance of DECT-2020 NR in an Industrial Environment for Varying RF Bands
Mattes Waßmann and Alexander Poets (Leibniz University Hannover, Germany); Jürgen Peissig (Leibniz Universität Hannover, Germany); Jens Pilz (Sennheiser, Germany)
As there are no publications regarding the perfor- mance of DECT-2020 NR in real-life scenarios yet, this paper is a first performance assessment of DECT-2020 NR in the 450, 1350 and 3700 MHz frequency bands at different numerologies with bandwidths ranging from 1.728 to 13.824 MHz. To show the improvement of the new DECT-2020 standard a comparison with the classic DECT standard in a rayleigh fading channel is done. In the course of this evaluation, performance metrics such as bit error rate (BER) and packet error rate (PER) were considered. Furthermore, MATLAB-generated DECT-2020 NR packets were transmitted utilizing GNU Radio and Ettus USRPs. The measurements were conducted in an industrial production line. Overall, the packet error rates were found to be the best at 450 MHz, with less than 5 % packet loss. At 1350 MHz, a packet error rate of 15 % was observed, whereas at 3700 MHz, a maximum value of 10 % was recorded. The differences in PER for the different frequencies is attributed to the internal losses at higher frequencies in the used USRP B210s. Another aspect of this work focuses on characterizing the indoor channel of the production line using OFDM-based channel sounding. An average RMS delay spread of 65 ns was measured for a bandwidth of 13.824 MHz in the selected frequency bands.
Consolidate Viability and Information Theories for Task-Oriented Communications: The Case of Remote Power Plants
Ozgur Ercetin and Mohaned Chraiti (Sabanci University, Turkey); Rustu Erciyes Karakaya (University of Maryland, USA)
The next generation of cellular networks, 6G, is expected to offer a handful of exciting applications and services, including holographic communications, machine-to-machine communications, and data sensing from millions of devices. Whether these services come with a Gbps rate requirement or call for massive connectivity, they translate to the need for more spectral resources that are deemed to be scarce and costly. The communications resource should be wisely managed through value-driven approaches that eliminate waste and continuously enhance the communication process. These management principles align with the Task-Oriented Communications (TOC) philosophy. The aim is to allocate the minimum necessary communication resources according to the receiver (actor) goal. In the pursuit of the goal, the receiver may encounter irregularities and unforeseen events, rendering unclear how to build knowledge on the receiver’s state and communicate accordingly. Our management approach integrates viability theory and transfer entropy to maintain the actor within a viable space, in contrast to the conventional approaches that help the actor to pass through singular states. By favoring a set of viable states aligned with the receiver (actor) goal and gradually reducing information exchange through knowledge accumulation, our method enhances flexibility and minimizes the risk of the receiver entering a non-viable state, thereby optimizing the communication resource as per the receiver goal. We discuss these theories in the context of TOC and examine their application in the plant process control case.