Throughput-Outage Scaling Behaviors for Wireless Single-Hop D2D Caching Networks with Physical Model -- Analysis and Derivations

TL;DR

This paper analyzes the throughput-outage scaling laws for cache-aided single-hop D2D networks under physical channel models, revealing conditions under which power control and scheduling improve performance.

Contribution

It provides the first analysis of throughput-outage scaling laws under physical models and introduces a double time-slot framework to enhance performance without equal-throughput assumptions.

Findings

Power control and scheduling do not improve scaling under equal-throughput assumptions.

The double time-slot framework significantly improves throughput-outage scaling when unequal throughput is allowed.

Distinguishing links by communication distance is key to enhancing network performance.

Abstract

Throughput-Outage scaling laws for single-hop cache-aided device-to-device (D2D) communications have been extensively investigated under the assumption of the protocol model. However, the corresponding performance under physical models has not been explored; in particular it remains unclear whether link-level power control and scheduling can improve the asymptotic performance. This paper thus investigates the throughput-outage scaling laws of cache-aided single-hop D2D networks considering a general physical channel model. By considering the networks with and without the equal-throughput assumption, we analyze the corresponding outer bounds and provide the achievable performance analysis. Results show that when the equal-throughput assumption is considered, using link-level power control and scheduling cannot improve the scaling laws. On the other hand, when the equal-throughput assumption is not considered, we show that the proposed double time-slot framework with appropriate link-level power control and scheduling can significantly improve the throughput-outage scaling laws, where the fundamental concept is to first distinguish links according to their communication distances, and then enhance the throughput for links with small communication distances.