Comparison of Slotted Aloha-NOMA and CSMA/CA for M2M Communications in IoT Networks

Mazin, Asim; Elkourdi, Mohamed; Gitlin, Richard D.

doi:10.1109/vtcfall.2018.8691042

Cited by 17 publications

(13 citation statements)

References 7 publications

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“…The backoff time ranges from 0 to 2 c − 1, where c is the number of collisions experienced by the user. When the channel is in the idle state, the waiting time is ended then UN starts to send the packet [9], [10].…”

Section: Methodsmentioning

confidence: 99%

“…CRA achieves throughput of T = 0.9 − 3.9 packet/slot, while another multiple access technique, i.e, ALOHA has throughput of T = 0.184 packet/slot, slotted ALOHA has T = 0.37 packet/slot, and carrier sense multiple access with collision avoidance (CSMA/CA) has T = 0.5 − 0.8 packet/slot [8]. The proposed CRA is compared to the CSMA/CA, because CSMA/CA has better performance than that of ALOHA and Slotted ALOHA [9]- [11]. CRA has a better performance than other multiple access techniques, because CRA stores and utilizes collisions to remove interference, while other techniques throw away the collided packets.…”

Section: Introductionmentioning

confidence: 99%

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Investigating Suitable Multiple Access Techniques for Harbor Wireless Communication Systems

Fitriyani

Anwar

Andriansyah

2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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The multiple access communications for harbor environment are suffering from both low quality transmission due many metallic obstacles and overloaded networks due to the huge number of users/devices of logistic monitoring. This paper proposes a coded random access (CRA) scheme with a degree distribution suitable for harbor environment to serve many devices and provide communications with high reliability. The degree distribution is optimized using extrinsic information transfer (EXIT) charts by keeping that two EXIT curves do not intersect at low mutual information points. Since we are working on the network level, of which the benefit of broadband communications is kept for the fairness with the narrowband transmission, we convert the gain of broadband transmissions into an equivalent gain to the narrowband transmissions based on the Shannon channel capacity and coding theory. We then compare CRA to carrier sense multiple access with collision avoidance (CSMA/CA), because CSMA/CA has better performance compared to other techniques, such as ALOHA and Slotted ALOHA. We evaluate the performance of the proposed CRA and CSMA/CA using a series of computer simulation in additive white Gaussian noise (AWGN) and multipath Rayleigh fading channels in terms of throughput and packet-loss rate (PLR). The results confirmed that CRA with the proposed degree distribution is more suitable than CSMA/CA as a multiple access technique for harbor wireless communications, indicated that the proposed CRA has higher throughput and lower PLR. The results of this study are expected to contribute to the development of future harbor communication systems.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating Suitable Multiple Access Techniques for Harbor Wireless Communication Systems

Fitriyani

Anwar

Andriansyah

2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…Each gateway is always on, sends beacons regularly (several times per reporting period of devices), and sends ACKs back per received packet. We consider ALOHA to be used for modeling communications between devices and the access points in this scenario [49].…”

Section: A Coordination For Radio Access Controlmentioning

confidence: 99%

Interference management for coexisting Internet of Things networks over unlicensed spectrum

Azari

Masoudi

2021

Ad Hoc Networks

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The main building block of Internet of Things (IoT) ecosystem is providing low-cost scalable connectivity for the radio/compute-constrained devices. This connectivity could be realized over the licensed spectrum like Narrowband-IoT (NBIoT) networks, or over the unlicensed spectrum like NBIoT-Unlicensed, SigFox and LoRa networks. In this paper, performance of IoT communications utilizing the unlicensed band, e.g. the 863-870 MHz in the Europe, in indoor use-cases like smart home, is investigated. More specifically, we focus on two scenarios for channel access management: i) coordinated access, where the activity patterns of gateways and sensors are coordinated with neighbors, and ii) uncoordinated access, in which each gateway and its associated nodes work independently from the neighbor ones. We further investigate a distributed coordination scheme in which, devices learn to coordinate their activity patterns leveraging tools from reinforcement learning. Closed-form expressions for capacity of the system, in terms of the number of sustained connections per gateway fulfilling a minimum quality of service (QoS) constraint are derived, and are further evaluated using simulations. Furthermore, delayreliability and inter network interference-intra network collision performance tradeoffs offered by coordination are figured out. The simulation results highlight the impact of system and traffic parameters on the performance tradeoffs and characterize performance regions in which coordinated scheme outperforms the uncoordinated one, and vice versa. For example, for a packet loss requirement of 1%, the number of connected devices could be doubled by coordination.

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“…The RACH phase of the centralized RB allocation can use the game formulated for distributed RB allocation to achieve a lower average instantaneous AoI. Meanwhile, the random backoff time used in [23] and [44] does not consider different aging functions, when the backoff time is determined for each device. For instance, a long backoff time can be assigned to a device with higher AoI and exponential aging function, while a short backoff time can be assigned to a device with low AoI and linear aging function.…”

Section: A Age Of Informationmentioning

confidence: 99%

Centralized and Distributed Age of Information Minimization with non-linear Aging Functions in the Internet of Things

Park¹,

Saad²,

Zhou³

2021

Preprint

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Resource management in Internet of Things (IoT) systems is a major challenge due to the massive scale and heterogeneity of the IoT system. For instance, most IoT applications require timely delivery of collected information, which is a key challenge for the IoT. In this paper, novel centralized and distributed resource allocation schemes are proposed to enable IoT devices to share limited communication resources and to transmit IoT messages in a timely manner. In the considered system, the timeliness of information is captured using non-linear age of information (AoI) metrics that can naturally quantify the freshness of information. To model the inherent heterogeneity of the IoT system, the non-linear aging functions are defined in terms of IoT device types and message content. To minimize AoI, the proposed resource management schemes allocate the limited communication resources considering AoI. In particular, the proposed centralized scheme enables the base station to learn the device types and to determine aging functions. Moreover, the proposed distributed scheme enables the devices to share the limited communication resources based on available information on other devices and their AoI. The convergence of the proposed distributed scheme is proved, and the effectiveness in reducing the AoI with partial information is analyzed. Furthermore, the proposed resource management schemes with different number of devices, activation probabilities, and outage probabilities are analyzed in terms of the average instantaneous AoI. Simulation results show that the proposed centralized scheme achieves significantly lower average instantaneous AoI when compared to simple centralized allocation without learning, while the proposed distributed scheme achieves significantly lower average instantaneous AoI when compared to random allocation. The results also show that the proposed centralized scheme outperforms the proposed distributed scheme in almost all cases, but the distributed approach is more viable for a massive IoT.

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Comparison of Slotted Aloha-NOMA and CSMA/CA for M2M Communications in IoT Networks

Cited by 17 publications

References 7 publications

Investigating Suitable Multiple Access Techniques for Harbor Wireless Communication Systems

Investigating Suitable Multiple Access Techniques for Harbor Wireless Communication Systems

Interference management for coexisting Internet of Things networks over unlicensed spectrum

Centralized and Distributed Age of Information Minimization with non-linear Aging Functions in the Internet of Things

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