An Improved Polling Scheme for PCF MAC Protocol

Liu, Qianlin; Zhao, Dixian; Ding, Hongwei

doi:10.1109/wicom.2011.6040385

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…Some undesirable poll occurring will result in the wasting of bandwidth if the AP polls some clients without data to send or receive. Therefore, two-class priority client polling mechanism based on queuing theory is proposed in some literatures [19][20][21]. However, due to the side-effects of PCF, they work inefficiently in multiple APs cochannel deployment and high density WLANs.…”

Section: Priority Channel Accessmentioning

confidence: 99%

Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

Lei

Jiang

Shang

2018

Wireless Communications and Mobile Computing

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In Wireless Local Area Networks (WLANs), cochannel deployment can bound channel access delay and improve network capacity due to mitigating the collision and interference among different Access Points (APs). In this paper, we present a network model and an interference model for multiple APs cochannel deployment and propose a channel assignment mechanism which formulates the channel assignment problem into a time slot allocation problem. Meanwhile, we assign the channel based on the vertex coloring algorithm and make extra polls by utilizing the time slot reservation strategy to improve the channel assignment. Furthermore, we optimize the polling list of APs through classifying the clients to improve the channel utilization. The simulation results show that our proposed algorithm can improve the performance in terms of network throughput, transmission delay, and packet loss rate compared with the DCF (Distributed Coordination Function) and TMCA algorithms.

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Section: Priority Channel Accessmentioning

confidence: 99%

Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

Lei

Jiang

Shang

2018

Wireless Communications and Mobile Computing

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“…Point Coordination Function (PCF) is an optional access method specified by the original IEEE 802.11 standard [10]. PCF is supported only by infrastructure-mode networks because it uses a Point Coordination (PC) that resides in the AP to establish which station can transmit.…”

Section: Motivation and Related Workmentioning

confidence: 99%

RegionDCF: A Self-Adapting CSMA/Round-Robin MAC for WLAN

Gómez

Riggi

2015

Wireless Pers Commun

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This paper presents RegionDCF, a self-adapting Media Access Control protocol for WLAN that seamlessly behaves as either CSMA or round-robin access methods simultaneously taking advantage of their most effective properties. In contrast to preceding works in this area that focused on enhancements of a particular access protocol, or on a mechanism that switches between different access protocols, this paper proposes a single access protocol capable of behaving simultaneously as a pure contention-based (e.g., CSMA) and as a roundrobin-based protocol depending on traffic conditions. The main building block of the proposed protocol is the region, a cluster of nodes that establishes orderly access to the channel. Once a member of a region gains channel access through a contention-based protocol, it allows contention-free transmission to all other members of the region in a round-robin manner. The functionality of the protocol for UDP and TCP traffic is discussed. Simulation results show that RegionDCF outperforms standard CSMA-based IEEE 802.11 Distributed Coordination Function in many aspects, including higher throughput and channel efficiency.

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“…An analytical model was derived to quickly evaluate the throughput performance in the presence of both the inter-RAU hidden nodes (HN) problems and fiberdelay difference. Regarding the PCF mechanism, previous studies mainly focused on the performance in traditional WLAN (non-RoF) [8][9][10]. The most different character of the PCF is that it achieves coordination by a centralized algorithm Fig.1 The architecture of a simulcast RoF-based WLAN distributed antenna system where the AP runs the algorithm, while the DCF has a distributed algorithm run by all the stations.…”

Section: Introductionmentioning

confidence: 99%

Improved IEEE 802.11 point coordination function considering fiber-delay difference in distributed antenna systems

Fan

et al. 2014

2014 IEEE International Conference on Communications Workshops (ICC)

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Abstract-In this paper, we present an improved IEEE 802.11 wireless local-area network (WLAN) medium access control (MAC) mechanism for simulcast radio-over-fiber-based distributed antenna systems where multiple remote antenna units (RAUs) are connected to one access point (AP). In the improved mechanism, the fiber delay between RAUs and central unit is taken into account in a modification to the conventional point coordination function (PCF) that achieves coordination by a centralized algorithm. Simulation results show that the improved PCF outperforms the distributed coordination function (DCF) in both the basic-access and request/clear-to-send modes in terms of the total throughput and the fairness among RAUs.

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An Improved Polling Scheme for PCF MAC Protocol

Cited by 4 publications

References 18 publications

Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

RegionDCF: A Self-Adapting CSMA/Round-Robin MAC for WLAN

Improved IEEE 802.11 point coordination function considering fiber-delay difference in distributed antenna systems

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