Sliding window-based Contention Resolution Diversity Slotted ALOHA

TL;DR

This paper introduces Sliding Window CRDSA and SW-IRSA, innovative unframed access schemes that leverage burst repetition and interference cancellation to enhance throughput and reduce delays in random access protocols.

Contribution

The paper proposes a novel sliding window approach for CRDSA and IRSA, improving performance over traditional frame-based methods by enabling unframed access.

Findings

SW-CRDSA and SW-IRSA outperform traditional methods in throughput.

Numerical results confirm improved packet delivery delay.

Unframed access schemes offer advantages in random access protocols.

Abstract

Contention Resolution Diversity Slotted ALOHA (CRDSA) and its burst degree optimizations (CRDSA++, IRSA) make use of MAC burst repetitions and Interference Cancellation (IC) making possible to reach throughput values as high as $T \simeq 0.8$ in practical implementations, whereas for the traditional slotted ALOHA $T \simeq 0.37$. However, these new techniques introduce a frame-based access to the channel that limits the performance in terms of throughput and packet delivery delay. In this paper, a new technique named Sliding Window CRDSA (SW-CRDSA) and its counterpart for irregular repetitions (SW-IRSA) are introduced in order to exploit the advantages of MAC burst repetition and Interference Cancellation (IC) with an unframed access scheme. Numerical results are also provided in order to validate the statement of better performance.