Sliding contention window (SCW): towards backoff range-based service differentiation over IEEE 802.11 wireless lan networks

Nafaa, Abdelhamid; Ksentini, Adlen; Mehaoua, Ahmed; lshibashi, B.; Iraqi, Youssef; Boutaba, Raouf

doi:10.1109/mnet.2005.1470682

Cited by 50 publications

(27 citation statements)

References 8 publications

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“…The Sliding Contention Window (SCW) [14] and the dynamic tuning algorithm of [15] (hereafter referred to as DTA) are, like ours, centralized solutions compatible with the 802.11e standard that do not require hardware modifications. In this section we compare our solution against these centralized mechanisms.…”

Section: Comparison Against Other Approachesmentioning

confidence: 97%

“…It implements independently for each station the protocol details and timing of the 802.11 EDCA MAC, and supports both saturated and non-saturated sources. We integrated into the simulator the proposed approach as well as other centralized solutions [14,15]. For all tests, we used a payload size of 1000 bytes and the system parameters of the IEEE 802.11b physical layer [22].…”

Section: Performance Evaluationmentioning

confidence: 99%

“…Most of the adaptive mechanisms proposed for IEEE 802.11 WLANs do not consider the impact of channel errors [4][5][6][7][8][9][10][11][12][13][14][15]. However, channel errors may influence these mechanisms since they are wrongly interpreted as collisions, leading to an unnecessary increase of the contention window and therefore to a suboptimal configuration.…”

Section: Impact Of Channel Errorsmentioning

confidence: 99%

“…Centralized approaches [14,15], based on a single node that periodically distributes the set of MAC layer parameters to be used by every station. These approaches are compatible with the 802.11e standard.…”

Section: Introductionmentioning

confidence: 99%

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A Control Theoretic Approach for Throughput Optimization in IEEE 802.11e EDCA WLANs

2008

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The MAC layer of the 802.11 standard, based on the CSMA/CA mechanism, specifies a set of parameters to control the aggressiveness of stations when trying to access the channel. However, these parameters are statically set independently of the conditions of the WLAN (e.g. the number of contending stations), leading to poor performance for most scenarios. To overcome this limitation previous work proposes to adapt the value of one of those parameters, namely the CW, based on an estimation of the conditions of the WLAN. However, these approaches suffer from two major drawbacks: i) they require extending the capabilities of standard devices or ii) are based on heuristics. In this paper we propose a control theoretic approach to adapt the CW to the conditions of the WLAN, based on an analytical model of its operation, that is fully compliant with the 802.11e standard. We use a Proportional Integrator controller in order to drive the WLAN to its optimal point of operation and perform a theoretic analysis to determine its configuration. We show by means of an exhaustive performance evaluation that our algorithm maximizes the total throughput of the WLAN and substantially outperforms previous standard-compliant proposals.

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Section: Comparison Against Other Approachesmentioning

confidence: 97%

Section: Performance Evaluationmentioning

confidence: 99%

Section: Impact Of Channel Errorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Control Theoretic Approach for Throughput Optimization in IEEE 802.11e EDCA WLANs

2008

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“…Lin ve arkadaşları WLAN performansını artırma yönünde bu yöntemi kullanmışlardır [3]. Bu yöntemi kullanan örnek diğer çalışmalar [4,5] [6]. Optimum çerçeve boyutunu bulmak için bir diğer alternatif yöntem, her başarısız iletim sonrası çerçeve boyutunun yarıya indirilmesi ve her başarılı iletim sonrası çerçeve boyutunun ikiye katlanmasıdır.…”

Section: Mevcut çAlişmalar (Related Work)unclassified

Düşük Hizli Kablosuz Ki̇şi̇sel Alan Ağlarinda Gürültülü Si̇nyallere Yöneli̇k Adapti̇f Veri̇ Di̇zi̇si̇ Üreteci̇

Arslan¹,

Okdem²

2015

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZET ADAPTIVE DATA SEQUENCE GENERATOR FOR NOISY SIGNALS IN LOW RATE WIRELESS PERSONAL AREA NETWORKS ABSTRACTWireless Personal Area Networks (WPANs) are computer networks used for data transmission among devices such as computers, telephones and industrial devices. These networks are operated in short ranges using low data rates and low-power radio signals. IEEE 802.15.4 protocol is a common standard used in these networks. Each packet is spitted into symbols including four data bits, and each of these symbols translated to thirty two bits Pseudo Noise(PN) chip sequences in physical layer of IEEE 802.15.4 protocol. In this paper, it is aimed to find the best data chip sequences to obtain maximum data transfer in a time unit for different wireless channel types for IEEE 802.15.4 protocol. To accomplish this, an adaptive data sequence generator mechanism is proposed. Performance analyses of IEEE 802.15.4 protocol with traditional and proposed PN sequences are made. The proposed method increased the packet transmission success by adjusting the lenght of chip sequences. These sequences considerably increase data throughput compared to standart IEEE 802.15.4 sequences. The success of the proposal is illustarated in tables and graphs showing comparative performance results.

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A real‐time noise resilient data link layer mechanism for unslotted IEEE 802.15.4 networks

Okdem

2015

Int J Communication

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Institute of Electrical and Electronics Engineers (IEEE) 802.15.4 is a protocol operating in media access control and physical layer, and it is commonly used in low-power and low data-rate wireless communications. In this paper, we develop a stochastic model for unslotted operations of IEEE 802.15.4 networks. Signal fading is an important factor in mobile communications. According to the level of fading, signalto-noise ratio gets dynamically changing values. Given a pair of nodes communicating to each-other in a mobile channel, the model calculates frame sizes providing maximum data-rate of successful IEEE 802.15.4 transmissions. The experimental results in various environments are given in the paper to discuss the success of the model. In the consideration of real-time operations, the model is improved to be operated in a lowcomplexity hardware/software unit. According to experimental results presented in the paper, the proposed model seems to be suitable in mobile environments by achieving high data-transfer rate for unslotted IEEE 802.15.4 protocol. of retransmission processes. Y.D. Lin and et al. studied to improve the network efficiency of WLAN by aggregating multiple frames into a single transmission [2]. Other studies given in [3,4] aimed to adjust the frame size in IEEE 802.11 networks. However, these studies are specific to the IEEE 802.11 protocol operations and not suitable for IEEE 802.15.4 based networks. A simple way to find optimum frame size is to decrease the size for each transmission failure and to increase the size for each successful transmission. Although implementation of this approach is easy, it is important to define the strategy of that how to change the values of the size. Approaches like [5,6] use channel statistics to find optimum frame size. However, these approaches are not suitable in IEEE 802.15.4 protocol because physical and medium access control (MAC) layers specifications of IEEE 802.11 and IEEE 802.15.4 protocols have different structures. Studies in [7, 8] present analysis of packet error rate (PER) using Markov models for various signal-to-interference ratios. Although PER is formulated for different scenarios, no adaptation is made to IEEE 802.15.4 protocol. Leea et al. propose an analytical model and present its performance using slotted carrier sense multiple access with collision avoidance (CSMA/CA) for IEEE 802.15.4 networks with acknowledging scheme [9]. However, this study includes no information about unslotted version of IEEE 802.15.4 networks. The authors of [10, 11] developed a stochastic model for unslotted IEEE 802.15.4 MAC operations. Although they analyzed the effect of the parameters such as duty cycles, collision and traffic rate in detail, no study is conducted for the channels that are effected by noise signals. W. Du and et al. studied the performance of IEEE 802.15.4 protocol for both slotted and unslotted operations [12]. A comprehensive analysis about packet delivery rate, latency, and energy consumption is given on their paper. An analysis of the ef...

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Sliding contention window (SCW): towards backoff range-based service differentiation over IEEE 802.11 wireless lan networks

Cited by 50 publications

References 8 publications

A Control Theoretic Approach for Throughput Optimization in IEEE 802.11e EDCA WLANs

A Control Theoretic Approach for Throughput Optimization in IEEE 802.11e EDCA WLANs

Düşük Hizli Kablosuz Ki̇şi̇sel Alan Ağlarinda Gürültülü Si̇nyallere Yöneli̇k Adapti̇f Veri̇ Di̇zi̇si̇ Üreteci̇

A real‐time noise resilient data link layer mechanism for unslotted IEEE 802.15.4 networks

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