Joint Coding of URLLC and eMBB in Wyner's Soft-Handoff Network in the Finite Blocklength Regime

TL;DR

This paper proposes a finite blocklength coding scheme using dirty-paper coding in Wyner's soft-handoff network to enhance URLLC reliability without sacrificing eMBB performance, outperforming time-sharing methods.

Contribution

It introduces a novel joint coding scheme with finite blocklengths that exploits DPC to mitigate interference, providing rigorous error bounds and demonstrating improved reliability over standard approaches.

Findings

Lower error probabilities for URLLC and eMBB compared to time-sharing.

Effective interference pre-cancellation using dirty-paper coding.

Enhanced reliability in low-latency communication scenarios.

Abstract

Wyner's soft-handoff network is considered where transmitters simultaneously send messages of enhanced mobile broadband (eMBB) and ultra-reliable low-latency communication (URLLC) services. Due to the low-latency requirements, the URLLC messages are transmitted over fewer channel uses compared to the eMBB messages. To improve the reliability of the URLLC transmissions, we propose a coding scheme with finite blocklength codewords that exploits dirty-paper coding (DPC) to precancel the interference from eMBB transmissions. Rigorous bounds are derived for the error probabilities of eMBB and URLLC transmissions achieved by our scheme. Numerical results illustrate that they are lower than for standard time-sharing.