Assessment of the IEEE 802.11e EDCA Protocol Limitations when Dealing with Real-Time Communication

Moraes, Ricardo; Portugal, Paulo; Vasques, Francisco; Custódio, Ricardo Felipe

doi:10.1155/2010/351480

Cited by 16 publications

(14 citation statements)

References 35 publications

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“…A TXOP is a time-bounded interval in which a station keeps the medium access control [17]. MCF adopts the enhanced distributed channel access (EDCA) as the mandatory MAC scheme, which is a contention-based channel access mechanism based on carrier sensing multiple access with collision avoidance (CSMA/CA).…”

Section: Ieee 80211s Overviewmentioning

confidence: 99%

“…As the EDCA mechanism provides four access categories for traffic differentiation, it would be expected that the highest access category (voice) would be adequate to transfer RT traffic. However, some research papers, analyzing single-hop networks, show that default parameter values of EDCA mechanism are just able to guarantee RT requirements for a smaller number of stations with large message stream periods [17].…”

Section: Related Workmentioning

confidence: 99%

“…The assessment presented in [17] shows that EDCA contention parameters play an important role in the communication, where by adjusting them, it is possible to improve the communication performance. In [29], the authors propose to not double the contention window size in the case of a virtual collision that is not followed by a real collision, where the backoff time is shortened and the traffic is only penalized if it collides during the medium access (i.e., a real collision).…”

Section: Related Workmentioning

confidence: 99%

“…In order to investigate the impact of EDCA parameters in the WMNs communication behavior, we assess the effects of varying the contention window size used to transmit RT traffic. Similarly to the assessment presented in [17], we examined all the possible combinations of aCW min and aCW max between 1 and 1,023. We chose to reproduce the scenario where the network utilization is 30% and the mixed priority traffic separation is imposed between RT traffic and interference traffic.…”

Section: Varying the Contention Window Sizementioning

confidence: 99%

“…Usually, authors focus on the proposed mechanisms and their performance, and, in some cases, relevant simplifications are made (e.g., ideal wireless channel conditions [15]). Consequently, the related assessments may not reflect the real-world behavior, which is usually prone to interference of non-RT traffic sources that may impact in the communication performance, as highlighted in [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Real-time communication in IEEE 802.11s mesh networks: simulation assessment considering the interference of non-real-time traffic sources

Viegas

Vasques

Portugal

et al. 2014

J Wireless Com Network

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With the widespread deployment of wireless mesh networks (WMNs) in industrial environments, real-time (RT) communication may benefit from the multi-hop relaying infrastructure provided by WMNs. However, RT communication must be able to coexist with non-RT traffic sources that will interfere with RT communication. Within this context, this paper assesses the impact of interferences caused by non-RT traffic sources upon RT traffic in IEEE 802.11s mesh networks. Through an extensive set of simulations, we assess the impact of external traffic sources upon a set of RT message streams in different communication scenarios. According to the simulation results, we infer that RT traffic in 802.11s networks may be highly affected by external interferences, and therefore, such interferences must be taken into account when setting-up 802.11s networks. By varying the network load imposed by external interferences, we provide some useful hints about utilization thresholds above which the network can no longer reliably support RT traffic. We also present insights about the setting-up of some network parameters in order to optimize the RT communication performance.

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Section: Ieee 80211s Overviewmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Varying the Contention Window Sizementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Real-time communication in IEEE 802.11s mesh networks: simulation assessment considering the interference of non-real-time traffic sources

Viegas

Vasques

Portugal

et al. 2014

J Wireless Com Network

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A review of scalability and topological stability issues in IEEE 802.11s wireless mesh networks deployments

Sampaio

Souto

Vasques

2015

Int J Communication

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Scalability and topological stability are two of the most challenging issues in current wireless mesh networks (WMNs) deployments. In the literature, both the scalability and the topological stability of WMNs are described as likely to suffer from poor performance due to the ad hoc nature of the underlying IEEE 802.11 mechanisms. The main contribution of this article is a comprehensive review of the main topological stability and scalability-related issues in IEEE 802.11s-based networks. Moreover, the most relevant proposed solutions are surveyed, where both the drawbacks and the merits of each proposal are highlighted. At the end of the article, some open research challenges are presented and discussed. It is expected that this work may serve as motivation for more and deeper research on these issues to allow the design of future more stable and scalable IEEE 802.11s mesh networks deployments. 672 S. SAMPAIO, P. SOUTO AND F. VASQUES Figure 1. IEEE 802.11s network elements described in the standard [5].are combined with node H as it provides connectivity to the BSS B3-so, acting as mesh gate-and also connects the MBSS to a non-802.11 LAN, so acting as a portal. Note that any mesh gate is also a mesh STA.The aforementioned mesh properties enable, among other, fast deployment, low installation cost, and reliable communication. Consequently, their application spans a wide range of application domains from broadband home, community, and neighboring-enterprise-metropolitan areatransportation systems to building automation, health, medical, and security surveillance networks [6]. Nevertheless, current IEEE 802.11s mesh network deployments are typically small-sized, and it is yet unclear if they can scale to realistic network sizes, and support more demanding types of traffic such as real-time communication § .The challenge of introducing mesh capabilities in both medium access control (MAC) and physical (PHY) layers, while keeping compatibility with other IEEE 802.11 standards, makes the recently released IEEE 802.11s standard a hot topic of interest by researchers in the WMN's field. This article addresses the challenges to ensure scalability and topological stability in this networks.Scalability is a well-known issue in multi-hop networking, such as the IEEE 802.11s. Basically, when the size of the network increases, its performance behavior may significantly degrade [10]. It is an important factor for the performance of a mesh network [11]. However, this issue has not been studied in depth in the IEEE 802.11s; hence, there are still few research works in the literature about the scalability of IEEE 802.11s WMNs. The cause, as emphasized by Srivathsan et al. in [12], may be that network providers are beginning to implement their own mechanisms. Topological stability means that the self-organization process should be robust enough to sustain the assignment of links over a reasonable period without performance degradation or breakage; on the other hand, that the topology change and vicinity conditions (e.g., neighbors ...

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Dynamic TXOP Assignment in IEEE802.11e Multi-hop Wireless Networks Based on an Admission Control Method

Namazi

Moghim

Ghazvini

et al. 2017

Wireless Pers Commun

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Assessment of the IEEE 802.11e EDCA Protocol Limitations when Dealing with Real-Time Communication

Cited by 16 publications

References 35 publications

Real-time communication in IEEE 802.11s mesh networks: simulation assessment considering the interference of non-real-time traffic sources

Real-time communication in IEEE 802.11s mesh networks: simulation assessment considering the interference of non-real-time traffic sources

A review of scalability and topological stability issues in IEEE 802.11s wireless mesh networks deployments

Dynamic TXOP Assignment in IEEE802.11e Multi-hop Wireless Networks Based on an Admission Control Method

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