Hybrid automatic repeat request
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Average age of information with hybrid ARQ under a resource constraint Open
Scheduling the transmission of status updates over an error-prone communication channel is studied in order to minimize the long-term average age of information at the destination under a constraint on the average number of transmissions a…
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Analyzing Grant-Free Access for URLLC Service Open
5G New Radio (NR) is expected to support new ultra-reliable low-latency communication (URLLC) service targeting at supporting the small packets transmissions with very stringent latency and reliability requirements. Current Long Term Evolu…
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Deep Source-Channel Coding for Sentence Semantic Transmission With HARQ Open
Recently, semantic communication has been brought to the forefront because of its great success in deep learning (DL), especially Transformer. Even if semantic communication has been successfully applied in the sentence transmission to red…
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Reliable Transmission of Short Packets Through Queues and Noisy Channels Under Latency and Peak-Age Violation Guarantees Open
This paper investigates the probability that the delay and the peak-age of information exceed a desired threshold in a point-to-point communication system with short information packets. The packets are generated according to a stationary …
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MAC layer enhancements for ultra-reliable low-latency communications in cellular networks Open
Ultra-reliable low-latency communications (URLLC) entail the transmission of sporadic and small packets, with low latency and very high reliability. Among many potential areas of optimization for URLLC, the problems of large delays during …
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System Level Analysis of Uplink Grant-Free Transmission for URLLC Open
In the context of 5'th Generation (5G) New Radio (NR), new transmission procedures are currently studied for supporting the challenging requirements of Ultra-Reliable Low-Latency Communication (URLLC) use cases. In particular, grant free (…
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Fast HARQ Over Finite Blocklength Codes: A Technique for Low-Latency Reliable Communication Open
This paper studies the performance of delay-constrained hybrid automatic repeat request HARQ protocols. Particularly, we propose a fast HARQ protocol where, to increase the end-to-end throughput, some HARQ feedback signals and successive m…
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Age-Optimal Channel Coding Blocklength for an M/G/1 Queue with HARQ Open
We consider a communication system in which a source transmits information updates to a destination node through a binary erasure channel (BEC). When a packet containing an information update, which consists of a fixed number of informatio…
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Satellite-enabled LTE systems in LEO constellations Open
LTE-based satellite systems in LEO constellations are a promising solution for extending broadband coverage to areas not connected to a terrestrial infrastructure. However, the large delays and Doppler shifts over the satellite channel pos…
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A reinforcement learning approach to age of information in multi-user networks with HARQ Open
Scheduling the transmission of time-sensitive information from a source node to multiple users over error-prone communication channels is studied with the goal of minimizing the long-term average age of information (AoI) at the users. A lo…
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Enhanced Machine Learning Techniques for Early HARQ Feedback Prediction in 5G Open
We investigate Early Hybrid Automatic Repeat re-Quest (E-HARQ) feedback schemes enhanced by machine learning techniques as a path towards ultra-reliable and low-latency communication (URLLC). To this end, we propose machine learning method…
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Adaptive Bit Rate Control in Semantic Communication With Incremental Knowledge-Based HARQ Open
Semantic communication has witnessed a great progress with the development of natural language processing (NLP) and deep learning (DL). Although existing semantic communication technologies can effectively reduce errors in semantic interpr…
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Efficient Low Complexity Packet Scheduling Algorithm for Mixed URLLC and eMBB Traffic in 5G Open
We address the problem of resource allocation and packet scheduling for a mixture of ultra- reliable low-latency communication (URLLC) and enhanced mobile broadband (eMBB) traffic in a fifth generation New Radio (5G NR) networks. A novel r…
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Caterpillar RLNC With Feedback (CRLNC-FB): Reducing Delay in Selective Repeat ARQ Through Coding Open
Wireless networks typically employ some form of forward error correction (FEC) coding and some automatic repeat request (ARQ) protocol to ensure reliable data transmission over lossy channels. We propose to integrate FEC and ARQ in the con…
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Performance Analysis of Single-Photon Avalanche Diode Underwater VLC System Using ARQ Open
Single photon avalanche diode (SPAD) has recently been introduced as a powerful detector for long distance underwater visible light (UVLC) communication. In this paper, the performance of the SPAD detector in UVLC is analyzed considering t…
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Statistical QoS Analysis of Reconfigurable Intelligent Surface-Assisted D2D Communication Open
This work performs the statistical QoS analysis of a Rician block-fading\nreconfigurable intelligent surface (RIS)-assisted D2D link in which the\ntransmit node operates under delay QoS constraints. First, we perform mode\nselection for th…
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A Blind Retransmission Scheme for Ultra-Reliable and Low Latency Communications Open
This work is related to 5G new radio concept design, with focus on ultra-reliable and low latency communication (URLLC) use cases. We mainly target to achieve the stringent latency and reliability requirements for transmissions over the ai…
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Cross-Layer Designs and Analysis of Adaptive-Rate Transmission and ARQ for Free-Space Optical Communications Open
The impact of atmospheric turbulence is one of the most challenging issues for the widespread deployment of free-space optical (FSO) communication systems. To enhance the systems' performance, adaptive-rate (AR) transmission and automatic …
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On the performance of non-orthogonal multiple access in the finite blocklength regime Open
In this paper, we present a finite-block-length comparison between the\northogonal multiple access (OMA) scheme and the non-orthogonal multiple access\n(NOMA) for the uplink channel. First, we consider the Gaussian channel, and\nderive the…
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Performance Analysis of Hybrid ARQ for Ultra-Reliable Low Latency Communications Open
Considering an ultra-reliable low latency communication scenario, we assess the trade-off in terms of energy consumption between achieving time diversity through retransmissions and having to communicate at a higher rate due to latency con…
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Streaming High-Definition Real-Time Video to Mobile Devices with Partially Reliable Transfer Open
Delivering High-Definition (HD) real-time video to mobile devices is challenged with stringent constraints in delay and reliability. In the presence of network dynamics (e.g., channel errors and bandwidth fluctuations), the existing error-…
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Performance of Cognitive Stop-and-Wait Hybrid Automatic Repeat Request in the Face of Imperfect Sensing Open
The cognitive radio (CR) paradigm has the potential of improving the exploitation of the electromagnetic spectrum by detecting instantaneously unoccupied spectrum slots allocated to primary users (PUs). In order to support the process of s…
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URLLC Mode Optimal Resource Allocation to Support HARQ in 5G Wireless Networks Open
Ultra Reliable Low Latency Communication (URLLC) mode is a promising 5G technology for various real-time applications, such as, autonomous vehicles, augmented reality, and factory automation. Several papers on URLLC exist, however, most pa…
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Performance analysis of multiplexing and error control scheme for body area networks Open
In this paper, we theoretically analyze the performance of a multiplexing and error control scheme for body area networks. In our previous work, we proposed a quality of service (QoS) control optimization method that achieves optimal QoS c…
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TCP Performance Over Satellite-Based Hybrid FSO/RF Vehicular Networks: Modeling and Analysis Open
Recent years have witnessed a growing interest in Internet access from space assisted by low earth orbit (LEO) satellite networks. In the domain of the last-mile access for the Internet of Vehicles (IoV), hybrid free-space optical (FSO)/ra…
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Low-Latency Short-Packet Transmissions: Fixed Length or HARQ? Open
We study short-packet communications, subject to latency and reliability constraints, under the premises of limited frequency diversity and no time diversity. The question addressed is whether, and when, hybrid automatic repeat request (HA…
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Re-Transmission Diversity Multiple Access Based on SIC and HARQ-IR Open
We consider multiple access with re-transmission diversity (RTxD) based on a\nhybrid automatic request (HARQ) protocol with incremental redundancy (IR) in\nthis paper. In order to mitigate multiple access interference (MAI), we employ\nsuc…
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Ultra reliable communication via optimum power allocation for HARQ retransmission schemes Open
In this work, we develop low complexity, optimal power allocation algorithms that would allow ultra reliable operation at any outage probability target with minimum power consumption in the finite blocklength regime by utilizing Karush-Kuh…
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ARQ Assisted Short-Packet Communications for NOMA Networks Over Nakagami-m Fading Channels Open
Non-orthogonal multiple access (NOMA) is expected as a promising technology for satisfying massive connectivity requirements in Internet of Things (IoT). Besides, short-packet communications are a notable characteristic in IoT for low dela…
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5G-Enabled Fault Detection and Diagnostics: How Do We Achieve Efficiency? Open
The 5th-generation wireless networks (5G) technologies and mobile edge\ncomputing (MEC) provide great promises of enabling new capabilities for the\nindustrial Internet of Things. However, the solutions enabled by the 5G\nultra-reliable lo…