Irregular Repetition Slotted ALOHA With Energy Harvesting Nodes

Abstract

We propose an irregular repetition slotted ALOHA (IRSA) based uncoordinated random access scheme for energy harvesting (EH) nodes. Specifically, we consider the case in which each user has a battery that is recharged with harvested energy from the environment in a probabilistic manner. We analyze this scheme starting with a unit-sized battery at the nodes and extend the analysis to the case of a finite-sized battery. For both scenarios, we derive the asymptotic throughput expressions and obtain the optimized probability distributions for the number of packet replicas of the users. We demonstrate that for the case of IRSA with EH nodes, these optimized distributions perform considerably better than the alternatives, including slotted ALOHA (SA), contention resolution diversity slotted ALOHA (CRDSA), and IRSA, which do not take into account the EH process for both asymptotic and finite frame length scenarios.

Random Interleaving Multiplexing Based IRSA Random Access System for Satellite-Enabled Internet-of-Things

“…To further improve the throughput of RA schemes, some new schemes are proposed to resolve multiple packet collisions issue, such as those in literature [10]- [15]. In [10], the authors propose an IRSA with energy harvesting nodes RA protocol.…”

“…To further improve the throughput of RA schemes, some new schemes are proposed to resolve multiple packet collisions issue, such as those in literature [10]- [15]. In [10], the authors propose an IRSA with energy harvesting nodes RA protocol. In [11], authors further enhance the IRSA scheme performance by considering the received replica power imbalance due to the natural dispersion and open-loop power control mechanism.…”

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

“…To calculate the resulting PLR, we need to obtain ρ(x) and λ(x) polynomials, which are derived in [4] as λ(x) = Λ ′ (x) Λ ′ (1) and ρ(x) = e −GΛ ′ (1)(1−x) . Differently from [4], we utilize the ERDs instead of the RDs in the density evolution analysis of the decoding process.…”

“…whose proofs can be found in [1]. For the case with full battery at the beginning of a frame, we considerk = k−1 andl = l−1, and ignore the rst replica that is certainly transmitted since battery is full at the start of the frame.…”

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.…”