Buffer-Aided Relaying Network With Hybrid BNC for the Internet of Things: Protocol and Performance Analysis

Shijie Shi,Yitong Li,Suqin Pang,Di Zhang,Fasong Wang,Haris Gacanin

doi:10.1109/access.2020.2968368

Shijie Shi, Yitong Li + Show 4 more

Open Access

https://doi.org/10.1109/access.2020.2968368

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Abstract

In fifth generation and beyond Internet of things (5G-IoT), the buffer-aided relaying network provide an efficient way to maintain the coverage area and enhance the edge user's transmission experience. However, the effect of non-ideal factor to the buffer-aided relaying network, such as the signaling overhead, have not been investigated. In this paper, we propose a practical hybrid bit-level network coding (BNC) for the buffer-aided relaying network while taking the unreliable transmission, limited relay-buffer size and signaling overhead into consideration. Afterward, we derive its concise closed-form expressions and the associated upper bound expressions for the throughput, queuing delay and overflow probability. Monte-Carlo simulation proves the validness of our analysis. Simulation results also demonstrate that compared to existing studies, our proposal can enhance the system energy efficiency (EE) performance, and buffer size has a positive effect on the EE performance.

Highlights

It is well known that in the forthcoming fifth generation and beyond (5GB) era, Internet of things (IoT) aims to connect everything from everywhere at any time with a big picture of ubiquitous network [1]–[4]
We can find an interesting result: the growth rate of the best-effort buffer-aided hybrid bit-level network coding (BNC) is more significantly than that of the benchmark curve, which illustrates that the scheduling operation can reduce the dependence on the buffer size, i.e., the function of increasing the buffer resource can be alternately realized by proper scheduling design
The reason for this is that the scheduling controller can force the buffer queue to discharge the stored data according to the traffic load, real-time channel state information (CSI) and the available buffer resource, whereas the best-effort buffer-aided hybrid BNC has no such mechanism for the purpose of reducing signaling overhead

Summary

INTRODUCTION

It is well known that in the forthcoming fifth generation and beyond (5GB) era, Internet of things (IoT) aims to connect everything from everywhere at any time with a big picture of ubiquitous network [1]–[4]. Jamali defined different channel access modes in bidirectional relay network [28], and designed a strategy to dynamically select an optimal transmission mode according to the instantaneous link capability for higher sum rate These papers only considered the error-free link in their analytic modeling, and the practical signaling overheads, such as the preambles and the ACK/NACK messages, were ignored for simplicity. To the authors’ best knowledge, the performance (e.g., throughput, EE and et al.) of the buffer-aided hybrid one-way and twoway relay network considering the signaling overhead and unreliable link has not been analyzed, which motives us to form this work. The throughput performance of our proposed buffer-aided relaying network with hybrid BNC could be better than that of the existing optimal bidirectional relaying network [28] when the unreliable channel and signaling overhead are taken into account.

SYSTEM MODEL

PERFORMANCE ANALYSIS

NUMERICAL AND SIMULATION RESULTS

Findings

CONCLUSION