EQuB-Ethernet quality of service using black bursts

Sobrinho, J.L.; Krishnakumar, A. S.

doi:10.1109/lcn.1998.727669

Cited by 23 publications

(11 citation statements)

References 12 publications

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“…Sobrinho and Krishnakumar in [36] designed the EQuB (Ethernet Quality of Service Using Black Bursts) mechanism that also prioritizes the RT traffic by forcing the collision resolution in favor of the RT station. EQuB allows the coexistence of RT and non-RT traffic on the same network domain, providing a bounded access delay to RT packets.…”

Section: Deterministic Collision Resolutionmentioning

confidence: 99%

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Survey of Real-Time Communication in CSMA-Based Networks

Moraes

Vasques

Portugal

2010

NPA

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The purpose of this paper is to survey the state-of-the-art on real-time (RT) communication in CSMA-based networks and to identify the most suitable approaches to deal with the requirements imposed by next generation communication environments. The paper focuses in the two of the most relevant solutions that operate in shared broadcast environments, according to the CSMA medium access protocol (IEEE 802.3/802.11). RT communication solutions are classified according to two classification axes. The first axis is related to how collisions are dealt with. A second classification axis is related to the compatibility degree achieved by each of the proposed approaches. Finally, a RT communication framework that is adequate to support RT communication in shared environments is briefly discussed.

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Section: Deterministic Collision Resolutionmentioning

confidence: 99%

“…A relevant proposal has been made by Sobrinho and Krishnakumar [56], who adapted the EQuB mechanism (black burst) [36] to ad hoc CSMA wireless networks. This scheme requires the shutdown of the standard retransmission scheme.…”

Section: Deterministic Collision Resolutionmentioning

confidence: 99%

Survey of Real-Time Communication in CSMA-Based Networks

Moraes

Vasques

Portugal

2010

NPA

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“…A slightly different approach ( [23], [24], [27]) consists in shaping the traffic produced by each station, limiting its amount and burstiness. Modified CSMA protocols tamper the Ethernet's native CSMA/CD arbitration scheme in order to improve the temporal behavior of the network, either by reducing the probability of collisions (e.g., Virtual Time CSMA protocol [29], [33]) or by sorting out collisions in a deterministic way (e.g., Windows [29], CSMA/DCR [26], and EquB [41]). Token passing based mechanisms, allowing only the node in possession of a (unique) token to access the communication medium, have also been proposed (e.g., Timed-Token Protocol [28], RETHER [47], RT-EP [30], [31], and VTPE [3]).…”

Section: A Brief Survey On Real-time Techniquesmentioning

confidence: 99%

FTT-Ethernet: A Flexible Real-Time Communication Protocol That Supports Dynamic QoS Management on Ethernet-Based Systems

Pedreiras

Gai

Almeida

et al. 2005

IEEE Trans. Ind. Inf.

125

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Abstract-Ethernet was not originally developed to meet the requirements of real-time industrial automation systems and it was commonly considered unsuited for applications at the field level. Hence, several techniques were developed to make this protocol exhibit real-time behavior, some of them requiring specialized hardware, others providing soft-real-time guarantees only, or others achieving hard real-time guarantees with different levels of bandwidth efficiency. More recently, there has been an effort to support quality-of-service (QoS) negotiation and enforcement but there is not yet an Ethernet-based data link protocol capable of providing dynamic QoS management to further exploit the variable requirements of dynamic applications. This paper presents the FTT-Ethernet protocol, which efficiently supports hard-real-time operation in a flexible way, seamlessly over shared or switched Ethernet. The FTT-Ethernet protocol employs an efficient master/multislave transmission control technique and combines online scheduling with online admission control, to guarantee continued real-time operation under dynamic communication requirements, together with data structures and mechanisms that are tailored to support dynamic QoS management. The paper includes a sample application, aiming at the management of video streams, which highlights the protocol's ability to support dynamic QoS management with real-time guarantees.

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“…In the latter, the time interval t 3 guarantees that the VTPE/h-BEB station holding the token station will be able to transmit its message and an interrupt will occur when the message transfer is finished. Otherwise, if the collision resolution is not solved during the time interval t 3 , it means that the collisions are occurring just among standard Ethernet stations. Therefore, an interrupt will be generated after t 3 and the next VTPE/h-BEB station in the logical ring will be able to contend for the medium access.…”

Section: Timing Analysismentioning

confidence: 99%

“…Otherwise, if the collision resolution is not solved during the time interval t 3 , it means that the collisions are occurring just among standard Ethernet stations. Therefore, an interrupt will be generated after t 3 and the next VTPE/h-BEB station in the logical ring will be able to contend for the medium access.…”

Section: Timing Analysismentioning

confidence: 99%