Slotted ALOHA Protocol for Next Generation IoT

Abstract: Machine to Machine (M2M) communication is used to maintain the connectivity between the various devices in IoT. One of the major issues of Machine to Machine (M2M) communications is to enhance the network lifetime with the help of an efficient MAC protocols. Slotted ALOHA Protocol is simple random access technique used in low power applications like LoRaWAN (Long Range Wireless Area Network). This approach gives an improved result as compared to P-persistence slotted ALOHA. In this paper, we consider an IoT -M2M network comprises of a large no of devices that transmit data packets to a gateway. We have tried to reduce the collision, which directly reduce retransmission of data packets. We propose Adaptive pSlotted ALOHA Protocol using Successive Interference Cancellation (SIC). It offers high throughput and reduces the delay. It is the simplest way of the channel allotment among the users. The proposed p-Slotted ALOHA protocol using SIC is better than the p-persistence slotted ALOHA in term of delay and throughput. Keywords: MAC, M2M, Slotted ALOHA, LoRa-WAN, IoT, SIC

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A Successive Interference Cancellation based Random Access Channel Mechanism for Machine-to-Machine Communications in Cellular Internet-of-Things

IEEE Access ◽

10.1109/access.2021.3049439 ◽

2021 ◽

pp. 1-1

Author(s):

Yeduri Sreenivasa Reddy ◽

Ankit Dubey ◽

Abhinav Kumar ◽

Trilochan Panigrahi

Keyword(s):

Internet Of Things ◽

Interference Cancellation ◽

Random Access ◽

Successive Interference Cancellation ◽

Machine To Machine ◽

Access Channel ◽

Random Access Channel

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On Multiple Access of a Large Number of Machine-Type Devices in Cellular Networks

Information and Control Systems ◽

10.31799/1684-8853-2018-4-105-114 ◽

2018 ◽

pp. 105-114

Author(s):

O. S. Galinina ◽

S. D. Andreev ◽

A. M. Tyurlikov

Keyword(s):

Success Probability ◽

Random Access ◽

Time Interval ◽

Short Time Interval ◽

Control Mechanisms ◽

Network Access ◽

Smart Meters ◽

Machine To Machine ◽

Machine To Machine Communication ◽

Machine Communication

Introduction: Machine-to-machine communication assumes data transmission from various wireless devices and attracts attention of cellular operators. In this regard, it is crucial to recognize and control overload situations when a large number of such devices access the network over a short time interval.Purpose:Analysis of the radio network overload at the initial network entry stage in a machine-to-machine communication system.Results: A system is considered that features multiple smart meters, which may report alarms and autonomously collect energy consumption information. An analytical approach is proposed to study the operation of a large number of devices in such a system as well as model the settings of the random-access protocol in a cellular network and overload control mechanisms with respect to the access success probability, network access latency, and device power consumption. A comparison between the obtained analytical results and simulation data is also offered.

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Energy-Constrained Design of Joint NOMA-Diversity Schemes with Imperfect Interference Cancellation

Sensors ◽

10.3390/s21124194 ◽

2021 ◽

Vol 21 (12) ◽

pp. 4194

Author(s):

Fulvio Babich ◽

Giulia Buttazzoni ◽

Francesca Vatta ◽

Massimiliano Comisso

Keyword(s):

Interference Cancellation ◽

Energy Levels ◽

Random Access ◽

Actual Performance ◽

Available Energy ◽

Fifth Generation ◽

Code Modulation ◽

Energy Constrained ◽

The Relationship ◽

The Internet Of Things

This study proposes a set of novel random access protocols combining Packet Repetition (PR) schemes, such as Contention Resolution Diversity Slotted Aloha (CRDSA) and Irregular Repetition SA (IRSA), with Non Orthogonal Multiple Access (NOMA). Differently from previous NOMA/CRDSA and NOMA/IRSA proposals, this work analytically derives the energy levels considering two realistic elements: the residual interference due to imperfect Interference Cancellation (IC), and the presence of requirements on the power spent for the transmission. More precisely, the energy-limited scenario is based on the relationship between the average available energy and the selected code modulation pair, thus being of specific interest for the implementation of the Internet of Things (IoT) technology in forthcoming fifth-generation (5G) systems. Moreover, a theoretical model based on the density evolution method is developed and numerically validated by extensive simulations to evaluate the limiting throughput and to explore the actual performance of different NOMA/PR schemes in energy-constrained scenarios.

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A tuneable rat-race coupler for full duplex communications

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721000787 ◽

2021 ◽

pp. 1-7

Author(s):

G. T. Watkins

Keyword(s):

Interference Cancellation ◽

Phase Shifter ◽

Dipole Antenna ◽

Full Duplex ◽

Frequency Channel ◽

Ism Band ◽

Single Antenna ◽

Variable Attenuator ◽

Degree Of Isolation ◽

Better Than

Abstract Full duplex (FD) could potentially double wireless communications capacity by allowing simultaneous transmission and reception on the same frequency channel. A single antenna architecture is proposed here based on a modified rat-race coupler to couple the transmit and receive paths to the antenna while providing a degree of isolation. To allow the self-interference cancellation (SiC) to be maximized, the rat-race coupler was made tuneable. This compensated for both the limited isolation of the rat race and self-interference caused by antenna mismatch. Tuneable operation was achieved by removing the fourth port of the rat race and inserting a variable attenuator and variable phase shifter into the loop. In simulation with a 50 Ω load on the antenna port, better than −65 dB narrowband SiC was achieved over the whole 2.45 GHz industrial, scientific and medical (ISM) band. Inserting the S-parameters of a commercially available sleeve dipole antenna into the simulation, better than −57 dB narrowband SiC could be tuned over the whole band. Practically, better than −58 dB narrowband tuneable SiC was achieved with a practical antenna. When excited with a 20 MHz Wi-Fi signal, −42 dB average SiC could be achieved with the antenna.

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