Slot Time Synchronization for TDMA-Based Ad Hoc Networks

Wang, Fuqiang; Zeng, Peng; Yu, Haibin

doi:10.1109/iscsct.2008.240

Cited by 11 publications

(3 citation statements)

References 11 publications

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“…Therefore, perfect time synchronization is not necessary. Researchers have recently proposed several decentralized synchronization algorithms, such as , that have a timing accuracy of less than 10 μ s.…”

Section: The End‐to‐end Channel Allocation Scheme Channel Allocation mentioning

confidence: 99%

An end‐to‐end channel allocation scheme for a wireless mesh network

Tsao

Huang

et al. 2013

Int J Communication

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SUMMARYCo-channel interference seriously influences the throughput of a wireless mesh network. This study proposes an end-to-end channel allocation scheme (EECAS) that extends the radio-frequency-slot method to minimize co-channel interference. The EECAS first separates the transmission and reception of packets into two channels. This scheme can then classify the state of each radio-frequency-slot as transmitting, receiving, interfered, free, or parity. A node that initiates a communication session with a quality of service requirement can propagate a channel allocation request along the communication path to the destination. By checking the channel state, the EECAS can determine feasible radio-frequency-slot allocations for the end-to-end path. The simulation results in this study demonstrate that the proposed approach performs well in intra-mesh and inter-mesh communications, and it outperforms previous channel allocation schemes in end-to-end throughput.

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Section: The End‐to‐end Channel Allocation Scheme Channel Allocation mentioning

confidence: 99%

An end‐to‐end channel allocation scheme for a wireless mesh network

Tsao

Huang

et al. 2013

Int J Communication

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“…Compared to CSMA-based MAC policies [13], TDMAbased ones introduce a certain overhead. Apart from synchronizing nodes [14], in case of topology changes, slot re-allocation may be required which is a resourceconsuming process [15]. Topology-independent MAC policies are revisited here to tackle the latter problem, to inherently adapt to topology changes.…”

Section: Introductionmentioning

confidence: 99%

A probabilistic refined policy for topology-independent medium access control in ad hoc network environments

Dragonas¹,

Tsoumanis²,

Oikonomou³

2022

ITU J-FET

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Modern network environments are starting to engulf billions of different interconnected devices that support a wide range of applications. Depending on the case, these environments range from static (e.g., wireless sensors) to highly dynamic (e.g., vehicular networks) with respect to topology changes and have different constraints for throughput, time delay, energy consumption etc. Supporting such applications in a topology-varying ad hoc environment is a challenging task. Thus, TDMA-based MAC policies are revisited here and a new policy, i.e., the refined policy is proposed, which builds and improves on the topology-independent policies that appear in the literature. In particular, an individual access probability is introduced that is distributively calculated by each node to access time slots that may result to collisions, but if not then unused network resources will be utilized, thus, increasing throughput. The key idea under the refined policy is to identify and refrain from transmitting during slots that collisions are likely to appear. An analytical expression for the individual access probability is also derived here. It is also shown through simulation experiments that energy consumption is also reduced in addition to throughput incremented under the proposed policy.

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“…Furthermore, in a system under a TDMA policy, there is no need for the nodes to listen to the medium prior to transmitting [13], while at the same time TDMA's deterministic approach guarantees a minimum performance level in terms of throughput. On the other hand, specific challenges arise when TDMA policies are applied, such as the need for continuous synchronization among the devices [14]. The latter drawback's difficulty to tackle lies both on the aforementioned extensive data generated by IoT devices and on the deviation occurring on the different devices' clocks as time passes [15,16].…”

Section: Introductionmentioning

confidence: 99%

Implementation of a Topology Independent MAC (TiMAC) Policy on a Low-Cost IoT System

et al. 2020

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The emerging new paradigm under the fifth generation of wireless communications technologies (5G) and high expectations for massively expanding today’s Internet of Things (IoT) under 5G, are expected to support a large plurality of low-cost devices for an all-increasing number of new IoT applications. Many emerging IoT applications are going to take advantage of techniques and technologies that have high demands from low-cost devices in terms of processing large amounts of data and communication. For example, in systems based on fog computing technology, low-cost devices have to assign some of their limited resources for processing purposes. Considering the drawbacks emerging from using low-cost devices and the fact that many applications are in need for time-constrained approaches, TDMA-based Medium Access Control (MAC) policies need to be revisited and implemented in low-cost devices of today. In this sense, a policy independent of the underlying topology, TiMAC policy, is considered here and is implemented in low-cost devices using 433 MHz RF modules. Even though the implementation is limited by synchronization issues and a small number of nodes, the obtained experimental results demonstrate the potential for employing TDMA-based MAC policies on IoT systems consisting of low-cost devices.

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Slot Time Synchronization for TDMA-Based Ad Hoc Networks

Cited by 11 publications

References 11 publications

An end‐to‐end channel allocation scheme for a wireless mesh network

An end‐to‐end channel allocation scheme for a wireless mesh network

A probabilistic refined policy for topology-independent medium access control in ad hoc network environments

Implementation of a Topology Independent MAC (TiMAC) Policy on a Low-Cost IoT System

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