Energy-Harvesting Irregular Repetition Slotted ALOHA with Unit-Sized Battery

Abstract

We propose an irregular repetition slotted ALOHA (IRSA) based uncoordinated random access scheme for energy harvesting (EH) nodes. Specically, we consider the case in which each user has a unit-sized battery that is recharged with energy harvested from the environment in a probabilistic manner. We analyze this scheme by deriving asymptotic throughput expressions, and obtain optimized probability distributions for the number of packet replicas for each user. We demonstrate that for the case of IRSA with EH nodes, these optimized distributions perform considerably better than those of slotted ALOHA (SA), contention resolution diversity slotted ALOHA (CRDSA) and IRSA, which do not take into account the EH process, for both asymptotic and nite frame length scenarios.Index TermsSlotted ALOHA, energy harvesting, machine-tomachine (M2M) communications.

Asymptotic Analysis of Contention Resolution ALOHA with Replica Concatenation

“…Liva, in [5], proposes irregular repetition slotted ALOHA (IRSA), which generalizes CRDSA by varying the number of replicas, and optimizes the replica distributions via a graphbased asymptotic analysis to obtain (asymptotic) throughputs approaching 1. A more generic scheme, called coded slotted ALOHA [6], and many extensions on these schemes for different scenarios are also proposed (e.g., [7]- [11]).…”

Energy Harvesting Irregular Repetition ALOHA With Replica Concatenation

“…Another line of work [34] studies the approximate capacity of the energy harvesting channel with a finite battery. More recently, the authors in [35] propose energy harvesting IRSA (EH-IRSA) scheme by accommodating energy harvesting user nodes with a unit-sized battery, and then extend their work to the case of finite-sized battery equipped nodes in [36]. Specifically, they provide an asymptotic analysis of EH-IRSA by modifying density evolution according to the energy availability and design repetition distributions considering EH.…”