An overlay MAC layer for 802.11 networks

Rao, Ananth; Stoica, Ion

doi:10.1145/1067170.1067185

Cited by 101 publications

(74 citation statements)

References 32 publications

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“…However, SoftMAC [12], MadMAC [20], FreeMAC [19], and Overlay MAC Layer (OML) [17] have been found to be providing the initial platform for the development of TDMA-based MAC protocols for WiLD networks.…”

Section: Tdma-based Mac Protocolsmentioning

confidence: 99%

TDMA MAC Protocols for WiFi-based Long Distance Networks: A Survey

Hussain¹,

Sarma²,

Saikia³

2014

IJCA

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WiFi is widely being researched to use it beyond its original purpose of short-range communication. These kinds of efforts are stimulated due to its mass production and cost-effectiveness. WiFibased Long Distance (WiLD) networks envisage changing the rural communication scenario particularly in the undeveloped nations. However, CSMA/CA, the de-facto MAC protocol of WiFi, is found to be ill-suited for WiLD networks. As a result, various TDMA-based MAC protocols are proposed in the literature as an alternative to CSMA/CA. The proposed protocols have shown significant performance improvement in such scenarios. In this paper, we propose a classification framework of WiLD MAC protocols based on their major characteristics. Using the classification framework, a survey on the MAC protocols proposed for WiLD networks is presented. The distinctive features of the TDMA MAC protocols are critically examined by pointing out their strengths and weaknesses in WiLD environment. In addition, this paper puts forward some state of art open research challenges in this area.

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Section: Tdma-based Mac Protocolsmentioning

confidence: 99%

TDMA MAC Protocols for WiFi-based Long Distance Networks: A Survey

Hussain¹,

Sarma²,

Saikia³

2014

IJCA

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“…In [9], the authors implement a TDMA protocol over 802.11 for single-hop wireless networks to reduce power consumption of the nodes. A loosely synchronized Overlay MAC Layer (OML) has been used in [10] in order to improve the performance of 802.11 networks. They use a weighted-fair-queueing-based distributed slot allocation mechanism for scheduling the transmission of the nodes.…”

Section: Related Workmentioning

confidence: 99%

Real-Time Video Surveillance over IEEE 802.11 Mesh Networks

Kandhalu

Rowe

Rajkumar

et al. 2009

2009 15th IEEE Real-Time and Embedded Technology and Applications Symposium

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“…A few recent proposals attempt to take advantage of TDMA schedules for reducing interference and for fair resource allocation over CSMA based networks [11,12]. The Overlay MAC Layer (OML) [11] is an access control and scheduling scheme that partitions time into equal size slots and allocates these slots among loosely synchronized contending nodes.…”

Section: Related Workmentioning

confidence: 99%

“…The Overlay MAC Layer (OML) [11] is an access control and scheduling scheme that partitions time into equal size slots and allocates these slots among loosely synchronized contending nodes. Though OML implements temporal fairness and reduces interference by improving the predictability of medium access among nodes, the coarse time-slot based resource allocation does not address the QoS requirements of different applications.…”

Section: Related Workmentioning

confidence: 99%

Sticky CSMA/CA: Implicit synchronization and real-time QoS in mesh networks

et al. 2007

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We propose a novel approach to QoS for real-time traffic over wireless mesh networks, in which application layer characteristics are exploited or shaped in the design of medium access control. Specifically, we consider the problem of efficiently supporting a mix of Voice over IP (VoIP) and delay-insensitive traffic, assuming a narrowband physical layer with CSMA/CA capabilities. The VoIP call carrying capacity of wireless mesh networks based on classical CSMA/CA (e.g., the IEEE 802.11 standard) is low compared to the raw available bandwidth, due to lack of bandwidth and delay guarantees. Time Division Multiplexing (TDM) could potentially provide such guarantees, but it requires fine-grained network-wide synchronization and scheduling, which are difficult to implement. In this paper, we introduce Sticky CSMA/CA, a new medium access mechanism that provides TDM-like performance to real-time flows without requiring explicit synchronization. We exploit the natural periodicity of VoIP flows to obtain implicit synchronization and multiplexing gains. Nodes monitor the medium using the standard CSMA/CA mechanism, except that they remember the recent history of activity in the medium. A newly arriving VoIP flow uses this information to grab the medium at the first available opportunity, and then sticks to a periodic schedule, providing delay and bandwidth guarantees. Delay-insensitive traffic fills the gaps left by the real-time flows using novel contention mechanisms to ensure efficient use of the leftover bandwidth. Large gains over IEEE 802.11 networks are demonstrated in terms of increased voice call carrying capacity (more than 100% in some cases). We briefly discuss extensions of these ideas to a broader class of real-time applications, in which artificially imposing periodicity (or some other form of regularity) at the application layer can lead to significant enhancements of QoS due to improved medium access.

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An overlay MAC layer for 802.11 networks

Cited by 101 publications

References 32 publications

TDMA MAC Protocols for WiFi-based Long Distance Networks: A Survey

TDMA MAC Protocols for WiFi-based Long Distance Networks: A Survey

Real-Time Video Surveillance over IEEE 802.11 Mesh Networks

Sticky CSMA/CA: Implicit synchronization and real-time QoS in mesh networks

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