An efficient MAC protocol for provisioning fairness in vehicle to roadside communications

Siddik, Md. Abubakar; Moni, Shafika Showkat; Alam, Mohammad Shah

doi:10.1109/icece.2016.7853960

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The operation of CSMA/CA mechanism is controlled by several MAC parameters viz. minimum contention window (CWmin), maximum contention window (CWmax), DCF inter frame space (DIFS), and retry limit [5].…”

Section: Introductionmentioning

confidence: 99%

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2021

IJWMN

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This paper presents the design procedure of the NS-3 script for WLAN that is organized according to the hierarchical manner of TCP/IP model. We configure all layers by using NS-3 model objects and set and modify the values used by objects to investigate the effects of MAC parameters (access mechanism, CWmin, CWmax and retry limit) on the performance metrics viz. packet delivery ratio, packet lost ratio, aggregated throughput, and average delay. The simulation results show that RTS/CTS access mechanism outperforms basic access mechanism in saturated state, whereas the MAC parameters have no significant impact on network performance in non-saturated state. A higher value of CWmin improves the aggregated throughput in expense of average delay. The tradeoff relationships among the performance metrics are also observed in results for the optimal values of MAC parameters. Our design procedure represents a good guideline for new NS-3 users to design and modify script and results greatly benefit the network design and management.

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Section: Introductionmentioning

confidence: 99%

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2021

IJWMN

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“…As far as we are aware, there exists no other efficient MAC protocol that can provision proportional fairness in V2I communications while also realizing the requirements to support both safety and non-safety applications. A preliminary version of this work was presented in [21].…”

Section: Introductionmentioning

confidence: 99%

SAFE-MAC: Speed Aware Fairness Enabled MAC Protocol for Vehicular Ad-hoc Networks

Siddik

Moni

Alam

et al. 2019

Sensors

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Highly dynamic geographical topology, two-direction mobility, and varying traffic density can lead to fairness issues in Vehicular Ad-hoc Networks (VANETs). The Medium Access Control (MAC) protocol plays a vital role in sharing the common wireless channel efficiently between vehicles in a VANET system. However, ensuring fairness between vehicles can be a challenge in designing MAC protocols for VANET systems. The existing protocol, IEEE 802.11 DCF, ensures that the packet transmission rate for a particular vehicle is directly proportional to the amount of time a vehicle spends within a service area, but it does not guarantee that faster vehicles will be able to send the minimum number of packets. Other existing MAC protocols based on IEEE 802.11 are able to provide a minimum amount of data transmission regardless of velocity, but are unable to provide an amount of data transmission that is more proportionate to the time a vehicle spends in the service area. To address the above limitations, we propose a Speed Aware Fairness Enabled MAC (SAFE-MAC) protocol that calculates the residence time of a vehicle in a service area by using mobility metrics such as position, direction, and speed to synthesize the transmission probability of each individual vehicle with respect to its residence time. This is achieved by dynamically altering the values of parameters such as minimum contention window, maximum backoff stage, and retransmission limit in the MAC protocol. We then develop an analytical model to compare the performance of our proposed protocol with contemporary MAC protocols. Numerical analysis results show that our proposed protocol significantly improves fairness among the speed-varying vehicles in VANET.

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“…The energy consumption of a node is affected by several stages: idle stage, successful stage, collision stage and error stage[27]-[29]. Assume that 𝑃 𝑇𝑋 , 𝑃 𝑅𝑋 and 𝑃 𝐼𝐷𝐿𝐸 denote the energy consumption in transmitting state, receiving state and idle state of a node, respectively.…”

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confidence: 99%

A Modified IEEE 802.15.6 Mac Scheme to Enhance Performance of Wireless Body Area Networks in E-Health Applications

Siddik¹,

Hasi²,

Nitu³

et al. 2022

IJWMN

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The recently released IEEE 802.15.6 standard specifies several physical (PHY) layers and medium access control (MAC) layer protocols for variety of medical and non-medical applications of Wireless Body Area Networks (WBAN). The medical applications of WBAN has several obligatory requirements and constrains viz. high reliability, strict delay deadlines and low power consumption. The standard IEEE 802.15.6 MAC scheme is not able to fulfil the all requirements of medical applications of WBAN. To address this issue we propose an IEEE 802.15.6-based MAC scheme that is the modification of superframe structure, user priorities and access mechanism of standard IEEE 802.15.6 MAC scheme. The proposed superframe has three access phases: random access phases (RAP), manage access phases (MAP) and contention access phase (CAP). The proposed four user priorities nodes access the channel during RAP using CAMA/CA mechanism with a large value of contention window. The proposed MAC scheme uses RTS/CTS access mechanism instead of basic access mechanism to mitigate the effect of hidden and expose terminal problem. Moreover, we develop an analytical model to evaluate the performance of proposed MAC scheme and solve the analytical model using Maple. The results show that the modified IEEE 802.15.6 MAC scheme achieve the better performance in terms of reliability, throughput, average access delay, energy consumption, channel utilization and fairness compared to standard IEEE 802.15.6 MAC scheme in E-health applications.

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An efficient MAC protocol for provisioning fairness in vehicle to roadside communications

Cited by 5 publications

References 6 publications

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SAFE-MAC: Speed Aware Fairness Enabled MAC Protocol for Vehicular Ad-hoc Networks

A Modified IEEE 802.15.6 Mac Scheme to Enhance Performance of Wireless Body Area Networks in E-Health Applications

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