WO2005006785A3 - Method to achieve fast active scan in 802.11 wlan - Google Patents

Method to achieve fast active scan in 802.11 wlan Download PDF

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Publication number
WO2005006785A3
WO2005006785A3 PCT/IB2004/051211 IB2004051211W WO2005006785A3 WO 2005006785 A3 WO2005006785 A3 WO 2005006785A3 IB 2004051211 W IB2004051211 W IB 2004051211W WO 2005006785 A3 WO2005006785 A3 WO 2005006785A3
Authority
WO
WIPO (PCT)
Prior art keywords
probe
response
probe request
sta
respond
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2004/051211
Other languages
French (fr)
Other versions
WO2005006785A2 (en
Inventor
Zhun Zhong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP04744570A priority Critical patent/EP1647110B1/en
Priority to JP2006520088A priority patent/JP5080080B2/en
Priority to US10/564,654 priority patent/US7894405B2/en
Priority to CN200480020165.XA priority patent/CN1823501B/en
Publication of WO2005006785A2 publication Critical patent/WO2005006785A2/en
Publication of WO2005006785A3 publication Critical patent/WO2005006785A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

A method for fast active scanning and an Access Point apparatus that reduces the delay in convention active scanning. The method includes the step of giving an AP higher priority to transmit a probe response than is currently known. This priority comes at the delay of transmission of the probe response, so preferably the probe response can be delayed by just the time that the AP needs to prepare the response plus the time, if any, for the frame already in the air to finish. According to the invention, a method can include steps for: sending a uni-cast probe request message by an (STA) 238, 248, 268 on a particular channel having at least one Access Point (AP) 258, 278 in communication therewith; receiving by one particular (AP) 278 the probe request message sent by the (STA); sensing by the particular (AP) 278 of a point coordination function (PCF) interframe space (PIFS) 325 of the particular channel; and sending by the particular (AP) 278 of a probe response message to the (STA) 238 in response to the probe request message after the PIFS. As the probe request is uni-cast, there is no need for a backoff interval as only one AP will respond. Since normal traffic utilizes the longer DIFS space plus backoffs to avoid collisions, the AP will always be able to respond to a probe request of scan faster than other items can respond on the channel, thus giving the AP priority when sending the probe response message.
PCT/IB2004/051211 2003-07-15 2004-07-13 Method to achieve fast active scan in 802.11 wlan Ceased WO2005006785A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP04744570A EP1647110B1 (en) 2003-07-15 2004-07-13 Method to achieve fast active scan in 802.11 WLAN
JP2006520088A JP5080080B2 (en) 2003-07-15 2004-07-13 Method for performing high-speed active scanning in WLAN, access point, high-speed active scanning system, and first station
US10/564,654 US7894405B2 (en) 2003-07-15 2004-07-13 Method to achieve fast active scan in 802.11 WLAN
CN200480020165.XA CN1823501B (en) 2003-07-15 2004-07-13 Method, system to achieve fast active scan in WLAN, access point and mobile station

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US48742303P 2003-07-15 2003-07-15
US60/487,423 2003-07-15
US54187004P 2004-02-04 2004-02-04
US60/541,870 2004-02-04

Publications (2)

Publication Number Publication Date
WO2005006785A2 WO2005006785A2 (en) 2005-01-20
WO2005006785A3 true WO2005006785A3 (en) 2005-03-24

Family

ID=34068314

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/051211 Ceased WO2005006785A2 (en) 2003-07-15 2004-07-13 Method to achieve fast active scan in 802.11 wlan

Country Status (6)

Country Link
US (1) US7894405B2 (en)
EP (1) EP1647110B1 (en)
JP (1) JP5080080B2 (en)
KR (1) KR20060031867A (en)
CN (1) CN1823501B (en)
WO (1) WO2005006785A2 (en)

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Also Published As

Publication number Publication date
EP1647110B1 (en) 2012-06-13
JP2007519293A (en) 2007-07-12
US20060159041A1 (en) 2006-07-20
WO2005006785A2 (en) 2005-01-20
KR20060031867A (en) 2006-04-13
US7894405B2 (en) 2011-02-22
EP1647110A2 (en) 2006-04-19
JP5080080B2 (en) 2012-11-21
CN1823501A (en) 2006-08-23
CN1823501B (en) 2012-02-29

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