Two-Step Interference Cancellation for Energy Saving in Irregular Repetition Slotted ALOHA

2024-12-08

Global Communications Conference

AI Summary

This work addresses the excessive energy consumption of conventional Irregular Repetition Slotted ALOHA (IRSA) protocols in low-traffic scenarios, primarily caused by redundant transmissions. To mitigate this issue, the authors propose a two-stage interference cancellation mechanism that, for the first time, incorporates an early termination strategy into IRSA: upon successful decoding at an intermediate stage, a node can abort its scheduled retransmissions, thereby substantially reducing energy expenditure. A joint analytical model characterizing both energy consumption and success probability is developed under practical constraints of finite frame length and low channel load. Experimental results demonstrate that, at approximately 10% channel load, the proposed approach achieves a 33% reduction in energy consumption compared to standard ALOHA while preserving its throughput advantage.

Technology Category

• Planning, Routing, and Scheduling: Scheduling under Uncertainty
• Multiagent Systems: Agent Communication
• Search and Optimization: Sampling/Simulation-based Search

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Energy management for devices in mobile Web and WoT environments
• Search and Retrieval-Augmented AI: Web evaluation methodologies and metrics
• Security and Privacy: Large-scale security measurements

Abstract

We evaluate a modification of irregular repetition slotted ALOHA (IRSA) involving intermediate decoding and early transmission termination by some nodes, upon their decoding success. This is meant to avoid unnecessary transmissions, thereby reducing energy consumption. We expect this to be particularly useful at low loads, where most transmissions can be avoided as they do not often result in a collision and are therefore redundant. To validate this proposal, we observe that most of the literature related to IRSA considers an asymptotic heavily loaded regime; thus, we also present a model of energy consumption and success probability for frames of limited length and low offered loads. Thanks to our analysis, also confirmed by simulation, we are able to show that the proposed technique is able to reduce IRSA energy consumption by minimizing transmissions, while preserving performance gains over standard ALOHA. For example, we are able to get a 33% energy saving at offered loads around 10% without affecting throughput.

Problem

• energy saving
• irregular repetition slotted ALOHA
• unnecessary transmissions
• low load
• redundant transmissions

Innovation

• Two-Step Interference Cancellation
• Energy Saving
• Irregular Repetition Slotted ALOHA
• Early Transmission Termination
• Low Load Regime