Differentiation mechanisms for IEEE 802.11

Aad, Imad; Castelluccia, Claude

doi:10.1109/infcom.2001.916703

Cited by 420 publications

(290 citation statements)

References 4 publications

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“…This allows existing TCP/IP protocols to run over IEEE 802.11 WLAN just like wired Ethernet deployed. We can show [3] different standardization activities done at IEEE 802.11 PHY and MAC layers. The standard comprises three PHY layers, which are an InfraRed (IR) base band PHY; a frequency hopping spread spectrum (FHSS) radio and direct sequence spread spectrum (DSSS) radio.…”

Section: Description Of 80211 Standardmentioning

confidence: 99%

STUDY OF MOBILITY AND QoS OF 802.11 AND 802.11e WIRELESS LAN STANDARDS

Didi

Feham

2008

African Journal of ICT

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Quality of service (QoS) is a key problem in wireless environments where bandwidth is scarce and channel conditions are time varying and sometimes highly loss. Although IEEE 802.11 wireless LAN (WLAN) is the most widely used WLAN standard today, and the upcoming IEEE 802.11e QoS enhancement standard exists and introduces the QoS for supporting multimedia applications. This paper compares the propositions of standard IEEE 802.11e with the standard IEEE 802.11 without QoS, a simulation of these standards is performed by using the NS simulator. We test also the mobility and the roaming of stations. A discussion is presented in detail using simulation-based evaluations and we let us confirm the QoS of IEEE 802.11e compared to IEEE 802.11, but we have detected some weaknesses of 802.11e. It starves the low priority traffic in case of high load, and leads to higher collision rates, and did not make a good estimate of weight of queues, so there is an unbalance enters the flows with high priorities.

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Section: Description Of 80211 Standardmentioning

confidence: 99%

STUDY OF MOBILITY AND QoS OF 802.11 AND 802.11e WIRELESS LAN STANDARDS

Didi

Feham

2008

African Journal of ICT

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“…Some of these protocols [2,3,7] changed parameters in the IEEE 802.11 standard to be a function of deadlines, either choosing (i) inter-frame spacing (the amount of time that a station waits before transmitting) or (ii) the back-off times after a collision has occurred. These techniques are useful to meet deadlines because they can implement algorithms such as deadline monotonic [9].…”

Section: Related Workmentioning

confidence: 99%

“…Recently, the IEEE 802.11e profile was introduced with the intention of offering better support for Quality-of-Service. The previous approach [2,3,7] of choosing back-off times as a function of priorities was adopted, and the polling scheme in IEEE 802.11 was refined with traffic classes.…”

Section: Related Workmentioning

confidence: 99%

Static-Priority Scheduling of Sporadic Messages on a Wireless Channel

Andersson

Tovar

2006

Lecture Notes in Computer Science

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Consider the problem of scheduling sporadic messages with deadlines on a wireless channel. We propose a collision-free medium access control (MAC) protocol which implements static-priority scheduling and present a schedulability analysis technique for the protocol. The MAC protocol allows multiple masters and is fully distributed; it is an adaptation to a wireless channel of the dominance protocol used in the CAN bus. But unlike that protocol, our protocol does not require a node having the ability to receive an incoming bit from the channel while transmitting to the channel. Abstract. Consider the problem of scheduling sporadic messages with deadlines on a wireless channel. We propose a collision-free medium access control (MAC) protocol which implements static-priority scheduling and present a schedulability analysis technique for the protocol. The MAC protocol allows multiple masters and is fully distributed; it is an adaptation to a wireless channel of the dominance protocol used in the CAN bus. But unlike that protocol, our protocol does not require a node having the ability to receive an incoming bit from the channel while transmitting to the channel. Static-Priority Scheduling of Sporadic Messages on a Wireless Channel

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“…In order to support different QoS requirements for various types of service, a possibility is to support differentiation in the IEEE 802.11 MAC layer, as proposed in [12] - [15]. In [12], a simple priority scheme for IEEE 802.11 has been proposed, where a high priority station has a shorter waiting time when accessing the medium.…”

mentioning

confidence: 99%

“…The effectiveness is demonstrated by simulation. The work in [15] proposes three service differentiation schemes for IEEE 802.11 DCF. The first one is based on scaling the contention window according to the priority of each flow.…”

mentioning

confidence: 99%

Supporting service differentiation with enhancements of the IEEE 802.11 MAC protocol: Models and analysis

Battiti

2007

SCI CHINA SER F

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Abstract. As one of the fastest growing wireless access technologies, Wireless LANs must evolve to support adequate degrees of service differentiation. Unfortunately, current WLAN standards like IEEE 802.11 Distributed Coordination Function (DCF) lack this ability. Work is in progress to define an enhanced version capable of supporting QoS for multimedia traffic at the MAC layer. In this paper, we aim at gaining insight into three mechanisms to differentiate among traffic categories, i.e., differentiating the minimum contention window size, the Inter-Frame Spacing (IFS) and the length of the packet payload according to the priority of different traffic categories. We propose an analysis model to compute the throughput and packet transmission delays. In additions, we derive approximations to get simpler but more meaningful relationships among different parameters. Comparisons with discrete-event simulation results show that a very good accuracy of performance evaluation can be achieved by using the proposed analysis model.

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Differentiation mechanisms for IEEE 802.11

Cited by 420 publications

References 4 publications

STUDY OF MOBILITY AND QoS OF 802.11 AND 802.11e WIRELESS LAN STANDARDS

STUDY OF MOBILITY AND QoS OF 802.11 AND 802.11e WIRELESS LAN STANDARDS

Static-Priority Scheduling of Sporadic Messages on a Wireless Channel

Supporting service differentiation with enhancements of the IEEE 802.11 MAC protocol: Models and analysis

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