An analysis of a modified point coordination function in IEEE 802.11

Kanjanavapastit, Apichan; Landfeldt, Bjorn

doi:10.1109/pimrc.2003.1260411

Cited by 18 publications

(11 citation statements)

References 5 publications

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“…Thus polls, nulls and ACKs represent a source of bandwidth and energy waste. To reduce the overhead associated to the polling process, a modified operation of PCF was proposed in [9], where a CFP interval is divided into the distributed polling protocol period for uplink transmissions, without any polling overhead, and the real-time traffic downlink period. In [10], [11] a reduction in the number of poll packets is achieved by detecting periods of inactivity of polled stations.…”

Section: Related Work and Motivationsmentioning

confidence: 99%

An energy-efficient point coordination function using bidirectional transmissions of fixed duration for infrastructure IEEE 802.11 WLANs

Palacios

Granelli

Gajic³

et al. 2013

2013 IEEE International Conference on Communications (ICC)

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Abstract-The Point Coordination Function (PCF) of the IEEE 802.11 standard represents a well-known Medium Access Control (MAC) protocol providing Quality-of Service guarantees in Wireless Local Area Networks (WLANs). However, with the currently employed polling mechanism WLANs consume a significant amount of the energy resources from batterypowered user devices. To provide energy saving, an improved MAC protocol is presented in this paper, where bidirectional transmissions of fixed duration are incorporated into PCF in order to enable dynamic scheduling of real-time traffic. Based on this new strategy, wireless access points (APs) can estimate the proper duration of the Contention Free Period (CFP), in order to allow mobile stations to acknowledge any received data packet with a data packet equal to the received packet in size. Having this information, a mobile station, following the data exchange with the AP, can determine its wake-up timer and activate the sleep mode for the rest of the CFP interval. Comprehensive computerbased simulations demonstrate the feasibility of the proposed MAC improvements to achieve energy efficiency with negligible impact on packet delivery delay.

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Section: Related Work and Motivationsmentioning

confidence: 99%

An energy-efficient point coordination function using bidirectional transmissions of fixed duration for infrastructure IEEE 802.11 WLANs

Palacios

Granelli

Gajic³

et al. 2013

2013 IEEE International Conference on Communications (ICC)

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show abstract

“…The biggest disadvantage of PCF is that a lot of bandwidth is wasted by sending polls and NULL data when stations have no data to send. In order to reduce the overhead and increase the channel utilization, some works have investigated the performance of the PCF when used to support real-time traffic, and modified the standard PCF [4][5][6][7][8][9][10][11].These algorithms don't avoid unsuccessful polling. When a voice packet arrives, the station may transmit it in the next PCF.…”

Section: Related Workmentioning

confidence: 99%

Design of WLAN Control System Burst Data MAC Protocol

Huang

Xiaoying

2009

2009 International Forum on Computer Science-Technology and Applications

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Data transported through the control system of WLAN included: burst data (BD) and non-real-time data (NRD), distinguished each priority by different inter frame space (IFS). BD wait for SIFS, NRD must wait for DIFS while channel is idle. To improve the real-time of burst data of WLAN control system, design WLAN control MAC, BD stations sent RTS/CTS to reserve channel freeing SIFS; nonreal-time data transport through standard CSMA/CA and binary exponential random backoff algorithm (BEB). This paper presented the polling backoff algorithm (PBA) to solve the conflict of BD, improved the performance of real-time data and guaranteed the delay to keep the delay limited. Analysis and imitation demonstrates that wireless burst data MAC protocol proposed is preferable to standard wireless media access protocol for network control system.

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“…Various centralized polling protocols and scheduling algorithms (e.g. [14]) have been proposed to increase the channel utilization for the IEEE 802.11 point coordination function (PCF) [1]. The operation time period for each WS is divided into cycles of contention period (CP) and contention-free period (CFP), where CFP is utilized by either the PCF for real-time packet delivery.…”

Section: Introductionmentioning

confidence: 99%

Design and performance analysis on adaptive reservation-assisted collision resolution protocol for WLANs

Lin

Feng

2011

Wireless Netw

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In conventional IEEE 802.11 medium access control protocol, the distributed coordination function is designed for the wireless stations (WSs) to perform channel contention within the wireless local area networks (WLANs). Packet collision is considered one of the major issues within this type of contention-based scheme, which can severely degrade network performance for the WLANs. Research work has been conducted to modify the random backoff mechanism in order to alleviate the packet collision problem while the WSs are contending for channel access. However, most of the existing work can only provide limited throughput enhancement under specific number of WSs within the network. In this paper, an adaptive reservation-assisted collision resolution (ARCR) protocol is proposed to improve packet collision resulting from the random access schemes. With its adaptable reservation period, the contention-based channel access can be adaptively transformed into a reservation-based system if there are pending packets required to be transmitted between the WSs and the access point. Analytical model is derived for the proposed ARCR scheme in order to evaluate and validate its throughput performance. It can be observed from both analytical and simulation results that the proposed protocol outperforms existing schemes with enhanced channel utilization and network throughput.

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An analysis of a modified point coordination function in IEEE 802.11

Cited by 18 publications

References 5 publications

An energy-efficient point coordination function using bidirectional transmissions of fixed duration for infrastructure IEEE 802.11 WLANs

An energy-efficient point coordination function using bidirectional transmissions of fixed duration for infrastructure IEEE 802.11 WLANs

Design of WLAN Control System Burst Data MAC Protocol

Design and performance analysis on adaptive reservation-assisted collision resolution protocol for WLANs

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