Multi-Packet HARQ with Delayed Feedback

Alaa Khreis (1) , Philippe Ciblat (2) , Francesca Bassi (3) , Pierre Duhamel (4)

1 COMELEC - Département Communications & Electronique
2 COMELEC - Département Communications & Electronique
3 ESME Sudria - École spéciale de mécanique et d'électricité
4 L2S - Laboratoire des signaux et systèmes

In current wireless communication systems, the feedback required by the Hybrid Automatic ReQuest (HARQ) mechanism is received with some delay at the transmitter side. To alleviate this issue, parallel Stop-and-Wait HARQ is usually employed. In this paper, we propose a multi-packet HARQ protocol (also called superposition coding or multi-layer HARQ) to improve the user's delay distribution and increase the throughput, without any additional feedback such as Channel State Information. The performance analysis, provided from an information-theoretic point-of-view, shows that the proposed protocol offers better delay distribution, higher throughput and lower message error rate compared to the conventional parallel Stop-and-Wait HARQ, at the expense of increased decoding complexity.

Domains: Computer Science [cs]; Signal and Image Processing; Computer Science [cs]; Networking and Internet Architecture [cs.NI]

Alaa Khreis, Philippe Ciblat, Francesca Bassi, Pierre Duhamel. Multi-Packet HARQ with Delayed Feedback. International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sep 2018, Bologne, Italy. ⟨10.1109/PIMRC.2018.8580804⟩. ⟨hal-01825017⟩