Understanding the limitations of transmit power control for indoor wlans

Shrivastava, Vivek; Agrawal, Dheeraj; Mishra, Arunesh; Banerjee, Suman; Nadeem, Tamer

doi:10.1145/1298306.1298356

Cited by 51 publications

(32 citation statements)

References 10 publications

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“…Temporal stability of RSS: Some studies conclude that RSS fluctuates rapidly over fraction of seconds [19], while other studies [2], [20], [21] concur with our observation that the RSS values remains representative in the order of seconds. Unlike the above papers, we measure the stability of RSS in more detail: we show the variation of the RSS for different categories of links and map the stability of the RSS with respect to the empirical error rate and the zone of the link.…”

Section: Related Worksupporting

confidence: 90%

“…Some studies infer large variations in observed RSS [20] while others observe smaller variations [2], [21]. RSS is verified to be constant in some experiments [2] and lognormally distributed in others [1].…”

Section: Related Workmentioning

confidence: 99%

“…However, their objective is to quantify the amount of memory for different type of links and they not conclude on the distribution of these variables. Further, most of the existing studies [13], [20], [22] use the 2.4 GHz band which is prone to high external interference from Wi-Fi traffic, thus leading to false conculsions about the propagation effects. We avoid this by using the 5 GHz band and ensure the absence of external interference by using spectrum analyzers.…”

Section: Related Workmentioning

confidence: 99%

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Measurement and Analysis of Link Quality in Wireless Networks: An Application Perspective

Kolar

Razak

Mähönen

et al. 2010

2010 INFOCOM IEEE Conference on Computer Communications Workshops

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Abstract-Estimating the quality of wireless link is vital to optimize several protocols and applications in wireless networks. In realistic wireless networks, link quality is generally predicted by measuring received signal strength and error rates. Understanding the temporal properties of these parameters is essential for the measured values to be representative, and for accurate prediction of performance of the system. In this paper, we analyze the received signal strength and error rates in an IEEE 802.11 indoor wireless mesh network, with special focus to understand its utility to measurement based protocols. We show that statistical distribution and memory properties vary across different links, but are predictable. Our experimental measurements also show that, due to the effect of fading, the packet error rates do not always monotonically decrease as the transmission rate is reduced. This has serious implications on many measurementbased protocols such as rate-adaptation algorithms. Finally, we describe real-time measurement framework that enables several applications on wireless testbed, and discuss the results from example applications that utilize measurement of signal strength and error rates.

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Section: Related Worksupporting

confidence: 90%

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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Measurement and Analysis of Link Quality in Wireless Networks: An Application Perspective

Kolar

Razak

Mähönen

et al. 2010

2010 INFOCOM IEEE Conference on Computer Communications Workshops

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“…In [7], passive measurements of channel busy time are used to perform rate adaptation under congestion. In [23], [24], joint transmit power and rate control algorithms are proposed. However, typically, solutions exclude either the impact of transmit power, transmit rate or carrier sensing.…”

Section: Related Workmentioning

confidence: 99%

Joint Transmission Rate, Power, and Carrier Sense Settings: An Initial Measurement Study

Huehn

Merz

Sengul

2010

2010 Fifth IEEE Workshop on Wireless Mesh Networks

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Abstract-A substantial variety of control algorithms to adjust carrier sensing, transmission power, and transmission rate have been proposed for IEEE 802.11 wireless networks in the recent literature. Their objectives range from maximizing throughput, spatial reuse, and fairness to minimizing interference and congestion within the network. However, only a few of these have been implemented and analysed in practice, often because accessing and changing the necessary parameters in the wireless hardware is too difficult. Essentially, there is little understanding about the interactions of jointly adjusted transmission rate, power and carrier sense thresholds, and their impact on the aforementioned objectives. Therefore, in this paper, we focus on transmission rate, power and carrier sensing settings. We provide a detailed description of the common IEEE 802.11 radio hardware, especially in terms of carrier-sensing circuitry. We then present our results from our validation and initial measurement study, which demonstrate interactions between transmit power and rate under different carrier-sensing settings in a two link scenario. Our initial findings indicate there exists a limited number of ratepower combinations that achieve high performance in terms of either throughput and fairness both with and without carrier sensing. Furthermore, in the case of both strong and weak links exist in the network, turning carrier sensing off significantly improves performance.

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“…The power control is the essential factor in the WLAN to reduce interference in the shared medium, thereby allowing greater re-use and concurrency of communication. The data transfer rate is the base for the power control in WLAN (Shrivastava et al, 2007). The data transfer rate is interrelated with the power, because the size of the data rate and packet size reflects the power utilization in the WLAN networks.…”

Section: Introductionmentioning

confidence: 99%

A Guaranteed Time and Rate Control Method for Improving QoS in WLAN

Anitha¹,

Jayakumari²

2016

American Journal of Applied Sciences

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Wireless Local Area Network is a mobile network, which connects the users in a small specific area. The devices within the area connect with each other through the wireless access points. The main requirements for the connection between the wireless devices are the time and the power. The transmission time between the wireless devices should be less and the power should be effective for the transmission to avoid the loss. With these considerations, we propose a novel method which hybrids the guaranteed time and power. The proposed method is designed for the network, which quickly responds to the slight changes and the normal networks. Guaranteed time slots are used for the time management and the rate control is used for the guaranteed power. This method works well in both the sensitive and insensitive areas. The performance of the proposed work is accurately analyzed using the analytical and the simulation methods. The numerical results obtained is accurate with the simulation results obtained using the ns-2.34 simulator. The throughput obtained is higher for the sensitive areas with minimum delay than the insensitive areas and closely matches the analytical results.

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Understanding the limitations of transmit power control for indoor wlans

Cited by 51 publications

References 10 publications

Measurement and Analysis of Link Quality in Wireless Networks: An Application Perspective

Measurement and Analysis of Link Quality in Wireless Networks: An Application Perspective

Joint Transmission Rate, Power, and Carrier Sense Settings: An Initial Measurement Study

A Guaranteed Time and Rate Control Method for Improving QoS in WLAN

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