Abstract
The Release 16 completion unlocks the road to an exciting phase pertain to the sixth generation (6G) era. Meanwhile, to sustain far-reaching applications with unprecedented challenges in terms of latency and reliability, much interest is already getting intensified toward physical layer specifications of 6G. In support of this vision, this work exhibits the forward-looking perception of full-duplex (FD) cooperative relaying in support of upcoming generations and adopts as a mean concern the critical contribution of hybrid automatic repeat request (HARQ) mechanism to ultra-reliable and low-latency communication (URLLC). Indeed, the HARQ roundtrip time (RTT) is known to include basic physical delays that may cause the HARQ abandonment for the 1 ms latency use case of URLLC. Taking up these challenges, this article proposes a hybrid FD amplify-and-forward (AF)-selective decode-and-forward (SDF) relay-based system for URLLC. Over this build system, two HARQ procedures within which the HARQ RTT is shortened, are suggested to face latency and reliability issues, namely, the proposed and the enhanced HARQ procedures. We develop then an analytical framework of this relay based HARQ system within its different procedures. Finally, using Monte-Carlo simulations, we confirm the theoretical results and compare the proposed relay-assisted HARQ procedures to the source-to-destination (S2D) HARQ-based system where no relay assists the communication between the source and the destination.
Highlights
U LTRA-RELIABLE and low-latency communication (URLLC) is one of fifth generation (5G) driven use cases, for which the third partnership project (3GPP) and the international mobile telecommunications 2020 and beyond (IMT-2020) specified stringent latency and reliability requirements to fulfill
To evaluate the performance of our two proposed hybrid automatic repeat request (HARQ) procedures, we investigate extensive simulation performance analysis where we include as a reference, the source-to-destination (S2D) HARQbased system where no relay assists the communication between the source and the destination, the AF relaying scheme as the low latency relay processing scheme, and the selective decode-and-forward (SDF) relaying scheme that requires complex encoding and decoding algorithms
NUMERICAL RESULTS the performance of the proposed relay-based HARQ procedures are studied through numerical results, and are labeled respectively as, “proposed sim” and “enhanced sim” in all figures
Summary
U LTRA-RELIABLE and low-latency communication (URLLC) is one of fifth generation (5G) driven use cases, for which the third partnership project (3GPP) and the international mobile telecommunications 2020 and beyond (IMT-2020) specified stringent latency and reliability requirements to fulfill. The set of URLLC services with these demanding requirements in the real world, is inappropriate with the best effort manner of long term evolution (LTE) [3]. To this end, the 5G new radio (NR) has been standardized with a set of specifications in Rel. 15, which incorporates basic URLLC features. As part of Rel. 16, different areas of improvements have been specified for the NR URLLC foundation. One of these enhancements focused on the uplink control information (UCI), eventually, the HARQ feedback.
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