Efficient Data Forwarding for Machine Type Communications in Internet of Things Networks

Yujin Lim,Jaesung Park

doi:10.1155/2017/7865342

Abstract

The MTC (Machine Type Communications) system is one of the most promising technologies to provide IoT (Internet of Things) applications. The MTC system suffers from congestion due to limited data transmission capacity and burst traffic. The congestion disturbs data delivery, results in an increase of energy consumption due to data retransmission, and finally poses a threat to the providers of IoT applications. In this paper, we focus on the congestion problem and present an efficient data forwarding mechanism to regulate the burst channel access from a large number of MTC devices. To regulate the communication channel access from the devices, we predict the number of devices by separating traffic load into the prediction of the number of devices that newly attempt to have access and the prediction of the number of devices that retry to access the channel. Through simulations, we show that our mechanism improves access success probability and reduces collision probability and access delay.

Highlights

IoT (Internet of Things) is a system that enables data transfer among interrelated computing devices over a network without requiring human-to-computer interactions
As the number of devices which have data to send increases, the competition for the RACH (Random Access CHannel), which represents a sequence of time-frequency resources (RA slots), increases and collisions increase in number
In [12], a reject probability of random access attempts based on traffic load using a proportional integrative derivative controller is proposed

Summary

Introduction

IoT (Internet of Things) is a system that enables data transfer among interrelated computing devices over a network without requiring human-to-computer interactions. In MTC, a device which has data to send communicates with eNB (evolved Node-B) to reserve a channel resource in the following handshaking procedure [4, 5]. The device sends a request message with the selected preamble to eNB in order to reserve an uplink resource. If multiple devices select the same preamble and send request messages to eNB, the devices are assigned the same uplink resource. As the number of devices which have data to send increases, the competition for the RACH (Random Access CHannel), which represents a sequence of time-frequency resources (RA slots), increases and collisions increase in number. With the number of backlogged devices in the RA slot, we control the random access attempts of devices to reduce the resource competition.

Related Work

Proposed Mechanism

Performance Analysis

Findings

Conclusion