An efficient HARQ scheme for applications in multicast communication systems

Abstract

This paper deals with the performance evaluation and optimization of an efficient hybrid automatic repeat request (HARQ) scheme suitable for applications delivered over lossy multicast communication channels. In particular, different from previously investigated strategies, this paper proposes a modified HARQ scheme based on the symbol combining principle (MHARQ-SC) where multiple copies of a same packet are consecutively transmitted at each transmission opportunity. By considering as the performance metrics, the mean packet delivery delay, and the energy consumption per information packet, this paper presents suitable performance evaluation and optimization strategies tailored for multicast communications. For the sake of comparisons, it has been also analyzed, under the same operational conditions, the performance of different HARQ schemes optimized for multicast communications. Numerical results have been provided to validate the proposed performance evaluation and optimization approaches in the case of the MHARQ-SC scheme. An important result devised here is that the reported analytical results clearly highlight the performance gain of the proposed strategy in comparison with all the other considered alternatives.

Dynamic multicast link selections for buffer‐aided relaying networks

“…This implies also that , ∀ j . By introducing in the multicast content delivery model a memory, according to which the relay node keeps track of any error‐free packet reception during the transmission attempt, we can model the correct packet delivery to all the nodes belonging to the multicast group as an AMC process . Let χ i for 1≤ i ≤ M be the state of the process, defined as the number of nodes of the multicast group that have successfully received the packet under consideration.…”

Analysis of a receiver-based reliable broadcast approach for vehicular networks

“…The retransmission will be started if any acknowledgement from a neighbor in the table of neighbors is missing upon expiration of the acknowledgement window. Modified Hybrid Automatic Repeat reQuest-Symbol Combining (MHARQ-SC) [5] is an ACK-based approach such that a couple of packets to be transmitted are combined at first based on an SC algorithm and then transmitted to the intended receivers. It is assumed to deploy an error detection code at the receiver end able to detect any loss pattern and send a negative ACK to the sender side, otherwise a positive ACK will be sent.…”

Reliable Broadcasting in Vehicular Networks

“…The retransmission will be started if any acknowledgement from a neighbor in the table of neighbors is missing upon expiration of the acknowledgement window. MHARQ-SC [41] is an ACK-based approach such that a couple of packets to be transmitted are combined at first based on an Symbol Combining (SC) algorithm and then transmitted to the intended receivers. It is assumed to deploy an error detection code at the receiver end able to detect any loss pattern and send a negative ACK to the sender side, otherwise a positive ACK will be sent.…”