Self-Organization of Coverage of Densely Deployed WLANs Considering Outermost APs without Generating Coverage Holes

Shotaro KAMIYA; Keita NAGASHIMA; Koji YAMAMOTO; Takayuki NISHIO; Masahiro MORIKURA; Tomoyuki SUGIHARA

doi:10.1587/transcom.2016SNP0020

Self-Organization of Coverage of Densely Deployed WLANs Considering Outermost APs without Generating Coverage Holes

Shotaro KAMIYA, Keita NAGASHIMA, Koji YAMAMOTO, Takayuki NISHIO, Masahiro MORIKURA, Tomoyuki SUGIHARA

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In densely deployed wireless local area network (WLAN) environments, the arbitrary deployment of WLAN access points (APs) can cause serious cell overlaps among APs. In such situations, the ability to realize adaptable coverage using transmission power control (TPC) is effective for improving the area spectral efficiency. Meanwhile, it should be guaranteed that no coverage holes occur and that connectivity between APs and wireless stations (STAs) is maintained. In this paper, the self-organization of coverage domains of APs using TPC is proposed. The proposed technique reduces the incidence of coverage overlaps without generating area coverage holes. To detect coverage holes, STAs and/or APs are used as sensors that inform each AP of whether or not the points at which they exist are covered by the APs. However, there is a problem with this approach in that when the density of STAs is not sufficiently large, the occurrence of area coverage holes is inevitable because the points at which the sensors do not exist are not guaranteed to be covered by APs. This paper overcomes the problem by focusing APs that belong to network's outer boundary (boundary APs) and prohibiting the APs from operating at low transmission power levels, the idea being that the coverage domains of such APs always include the region covered by only those APs. The boundary APs are determined by performing Delaunay triangulation of the set of points at which all APs exist. Simulation results confirm the effectiveness of the proposed TPC scheme in terms of its ability to reduce the total overlap area while avoiding the occurrence of area coverage holes.

Publication: IEICE TRANSACTIONS on Communications Vol.E99-B No.9 pp.1980-1988

Publication Date: 2016/09/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2016SNP0020

Type of Manuscript: Special Section PAPER (Special Section on Integration Technologies of Ambient Intelligence and Sensor Networks)

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Authors

Shotaro KAMIYA
  Kyoto University
Keita NAGASHIMA
  Kyoto University
Koji YAMAMOTO
  Kyoto University
Takayuki NISHIO
  Kyoto University
Masahiro MORIKURA
  Kyoto University
Tomoyuki SUGIHARA
  the Allied Telesis Research Institute, Ltd.

Keyword

coverage adaptation, IEEE 802.11 WLAN, transmission power control, area coverage hole, coverage boundary

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Shotaro KAMIYA, Keita NAGASHIMA, Koji YAMAMOTO, Takayuki NISHIO, Masahiro MORIKURA, Tomoyuki SUGIHARA, "Self-Organization of Coverage of Densely Deployed WLANs Considering Outermost APs without Generating Coverage Holes" in IEICE TRANSACTIONS on Communications, vol. E99-B, no. 9, pp. 1980-1988, September 2016, doi: 10.1587/transcom.2016SNP0020.
Abstract: In densely deployed wireless local area network (WLAN) environments, the arbitrary deployment of WLAN access points (APs) can cause serious cell overlaps among APs. In such situations, the ability to realize adaptable coverage using transmission power control (TPC) is effective for improving the area spectral efficiency. Meanwhile, it should be guaranteed that no coverage holes occur and that connectivity between APs and wireless stations (STAs) is maintained. In this paper, the self-organization of coverage domains of APs using TPC is proposed. The proposed technique reduces the incidence of coverage overlaps without generating area coverage holes. To detect coverage holes, STAs and/or APs are used as sensors that inform each AP of whether or not the points at which they exist are covered by the APs. However, there is a problem with this approach in that when the density of STAs is not sufficiently large, the occurrence of area coverage holes is inevitable because the points at which the sensors do not exist are not guaranteed to be covered by APs. This paper overcomes the problem by focusing APs that belong to network's outer boundary (boundary APs) and prohibiting the APs from operating at low transmission power levels, the idea being that the coverage domains of such APs always include the region covered by only those APs. The boundary APs are determined by performing Delaunay triangulation of the set of points at which all APs exist. Simulation results confirm the effectiveness of the proposed TPC scheme in terms of its ability to reduce the total overlap area while avoiding the occurrence of area coverage holes.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2016SNP0020/_p

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@ARTICLE{e99-b_9_1980,
author={Shotaro KAMIYA, Keita NAGASHIMA, Koji YAMAMOTO, Takayuki NISHIO, Masahiro MORIKURA, Tomoyuki SUGIHARA, },
journal={IEICE TRANSACTIONS on Communications},
title={Self-Organization of Coverage of Densely Deployed WLANs Considering Outermost APs without Generating Coverage Holes},
year={2016},
volume={E99-B},
number={9},
pages={1980-1988},
abstract={In densely deployed wireless local area network (WLAN) environments, the arbitrary deployment of WLAN access points (APs) can cause serious cell overlaps among APs. In such situations, the ability to realize adaptable coverage using transmission power control (TPC) is effective for improving the area spectral efficiency. Meanwhile, it should be guaranteed that no coverage holes occur and that connectivity between APs and wireless stations (STAs) is maintained. In this paper, the self-organization of coverage domains of APs using TPC is proposed. The proposed technique reduces the incidence of coverage overlaps without generating area coverage holes. To detect coverage holes, STAs and/or APs are used as sensors that inform each AP of whether or not the points at which they exist are covered by the APs. However, there is a problem with this approach in that when the density of STAs is not sufficiently large, the occurrence of area coverage holes is inevitable because the points at which the sensors do not exist are not guaranteed to be covered by APs. This paper overcomes the problem by focusing APs that belong to network's outer boundary (boundary APs) and prohibiting the APs from operating at low transmission power levels, the idea being that the coverage domains of such APs always include the region covered by only those APs. The boundary APs are determined by performing Delaunay triangulation of the set of points at which all APs exist. Simulation results confirm the effectiveness of the proposed TPC scheme in terms of its ability to reduce the total overlap area while avoiding the occurrence of area coverage holes.},
keywords={},
doi={10.1587/transcom.2016SNP0020},
ISSN={1745-1345},
month={September},}

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TY - JOUR
TI - Self-Organization of Coverage of Densely Deployed WLANs Considering Outermost APs without Generating Coverage Holes
T2 - IEICE TRANSACTIONS on Communications
SP - 1980
EP - 1988
AU - Shotaro KAMIYA
AU - Keita NAGASHIMA
AU - Koji YAMAMOTO
AU - Takayuki NISHIO
AU - Masahiro MORIKURA
AU - Tomoyuki SUGIHARA
PY - 2016
DO - 10.1587/transcom.2016SNP0020
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E99-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2016
AB - In densely deployed wireless local area network (WLAN) environments, the arbitrary deployment of WLAN access points (APs) can cause serious cell overlaps among APs. In such situations, the ability to realize adaptable coverage using transmission power control (TPC) is effective for improving the area spectral efficiency. Meanwhile, it should be guaranteed that no coverage holes occur and that connectivity between APs and wireless stations (STAs) is maintained. In this paper, the self-organization of coverage domains of APs using TPC is proposed. The proposed technique reduces the incidence of coverage overlaps without generating area coverage holes. To detect coverage holes, STAs and/or APs are used as sensors that inform each AP of whether or not the points at which they exist are covered by the APs. However, there is a problem with this approach in that when the density of STAs is not sufficiently large, the occurrence of area coverage holes is inevitable because the points at which the sensors do not exist are not guaranteed to be covered by APs. This paper overcomes the problem by focusing APs that belong to network's outer boundary (boundary APs) and prohibiting the APs from operating at low transmission power levels, the idea being that the coverage domains of such APs always include the region covered by only those APs. The boundary APs are determined by performing Delaunay triangulation of the set of points at which all APs exist. Simulation results confirm the effectiveness of the proposed TPC scheme in terms of its ability to reduce the total overlap area while avoiding the occurrence of area coverage holes.
ER -