DRAMS: Double-RIS Assisted Multihop Routing Scheme for Device-to-Device Communication

Core Concepts

Proposing a double-RIS assisted multihop routing scheme for device-to-device communication networks to enhance performance and reduce resource wastage.

Abstract

The article introduces a novel multihop routing scheme utilizing reconfigurable intelligent surfaces (RISs) and intermediate users (IUs) as relays. It aims to improve wireless communication efficiency by strategically deploying RISs and leveraging idle IUs. The proposed scheme, named DRAMS, optimizes information transfer while considering energy harvesting capabilities of IUs. By reducing reliance on RIS density, the scheme enhances data rates and energy efficiency compared to existing approaches. The content is structured into sections covering system model, channel models, energy harvesting, delay-constrained transmission, strategy details, and delay analysis. System Model: Utilizes RISs and IUs for multihop communication. Considers path-loss effects and small-scale fading in wireless links. Energy Harvesting Model: Incentivizes idle IUs with energy harvesting capabilities. Delay Analysis: Investigates maximum acceptable delays at IUs based on waiting times. Analyzes scenarios with only IUs involved in information transfer.

Stats

"In this context, we assume that each Uj is equipped with an EH unit." "For a transmission power P, the power harvested at IU is [18] Pharv = Mh(1 −e−aP ρLd−α|h|2) 1 + e−a(P ρLd−α|h|2−b)." "Furthermore, these works do not consider the impact of the user traffic characteristics."

Quotes

"Numerical results demonstrate the advantage of the proposed scheme over some existing approaches." "Useful insights related to the proposed routing scheme are also obtained in this work."

Key Insights Distilled From

DRAMS

by Lakshmikanta... at arxiv.org 03-25-2024

https://arxiv.org/pdf/2307.05279.pdf

Deeper Inquiries

How can the DRAMS scheme adapt to dynamic network conditions

The DRAMS scheme can adapt to dynamic network conditions by its inherent design that leverages both idle intermediate users (IUs) and strategically placed reconfigurable intelligent surfaces (RISs). Dynamic Routing: The scheme dynamically selects the next hop based on the availability of idle IUs or RISs in the vicinity, ensuring efficient data transfer even in changing network conditions. Rate Adaptation: By choosing appropriate modulation schemes at each hop, DRAMS can adjust to varying channel conditions and optimize data rates for reliable communication. Energy Harvesting: With energy harvesting capabilities at the IUs, the scheme can adapt to fluctuations in power availability, making it resilient to changes in energy sources. Relay Selection: The selection of relays is based on real-time information about traffic characteristics and user activities, allowing for adaptive routing decisions. Delay Constraints: Considering delay constraints in the routing process enables DRAMS to prioritize timely delivery of data packets under varying network loads and congestion levels.

What potential challenges could arise from relying on idle intermediate users for relaying

Relying on idle intermediate users for relaying may pose several potential challenges: Availability: The primary challenge is ensuring a consistent availability of idle IUs when needed for relaying purposes. In dynamic networks with fluctuating user activities, there might be instances where no suitable relay is available within proximity. Reliability: Depending solely on idle IUs introduces a reliability concern as their participation as relays cannot always be guaranteed. This reliance on intermittent resources could lead to disruptions or delays in data transmission. Energy Consumption: While energy harvesting mitigates some concerns about depleting individual IU's energy reserves, there could still be issues related to overall energy consumption if too many hops are required or if certain nodes are overburdened with relay tasks. Interference: Idle IUs acting as relays may introduce interference issues due to simultaneous transmissions from multiple devices within close range, impacting signal quality and overall network performance.

How might advancements in energy harvesting technologies impact the effectiveness of DRAMS

Advancements in energy harvesting technologies have the potential to significantly impact the effectiveness of DRAMS: Increased Reliability: Improved energy harvesting capabilities would enhance the reliability of using idle intermediate users as relays since they would have more sustainable power sources available for continuous operation without draining their own batteries quickly. Extended Network Coverage: Enhanced energy harvesting technologies could enable longer operating times for devices acting as relays, expanding coverage areas and reducing gaps in connectivity within multihop networks facilitated by DRAMS. Energy Efficiency: More efficient energy harvesting mechanisms would contribute towards higher overall system efficiency by reducing dependency on external power sources and optimizing resource utilization across all nodes involved in relay operations.