CA2464046A1 - Optimally serving stations on wlans using contention/reservation protocol 802.11e - Google Patents

Optimally serving stations on wlans using contention/reservation protocol 802.11e Download PDF

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Publication number
CA2464046A1
CA2464046A1 CA002464046A CA2464046A CA2464046A1 CA 2464046 A1 CA2464046 A1 CA 2464046A1 CA 002464046 A CA002464046 A CA 002464046A CA 2464046 A CA2464046 A CA 2464046A CA 2464046 A1 CA2464046 A1 CA 2464046A1
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Prior art keywords
contention
cci
contenders
controlled
controlled contention
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.)
Granted
Application number
CA002464046A
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French (fr)
Other versions
CA2464046C (en
Inventor
Matthew J. Sherman
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AT&T Corp
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At&T Corp.
Matthew J. Sherman
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Publication of CA2464046A1 publication Critical patent/CA2464046A1/en
Application granted granted Critical
Publication of CA2464046C publication Critical patent/CA2464046C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/02—Hybrid access techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • 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]

Abstract

The Wireless LAN includes multiple stations (STAs) (101-103), mobile or Stationary, airlinked (104) to an access point (105) as a Basic Service Set (BSS). A Hybrid Coordinator (HC) (117) is collocated with the access point (105) for allocating the bandwidth for the BSS to using a Controlled Contention/Resource Reservation Protocol defined in the IEEE Standard 802.11(e). The HC (117) transmits Contention Control (CC) frames and initiat es Controlled Contention Intervals (CCI) having a selected number of slotted intervals. HC (117) receives Resource Reservations (RR) detailing band width needs from STA contenders during a specified time interval called the Controlled Contention Interval (CCI).Several parameters are installed in eac h CC for contention control purpose. The several parameters are controlled to optimize efficient use of the wireless medium (104) and reduce access delays for RR frames contending for the wireless medium (104).

Claims (15)

1. A method for optimally serving STAs on Wireless LANs using a Controlled Contention/Resource Reservation protocol of the IEEE
802.11e standard comprising:
(a) transmitting Contention Control (CC) frames and initiating Controlled Contention Intervals (CCI) having a selected number of slotted intervals (b) receiving Resource Reservations (RR) detailing bandwidth needs from STA contenders during the Controlled Contention Interval (CCI);
(c) installing in each CC frame several parameters including at least the number of Controlled Contention Opportunities (CC_OP) or slotted intervals for contention control purposes including feedback on successful RRs; and (d) controlling and setting the several parameters to optimize efficient use of the wireless medium and reduce access delays for RR frames contending for the wireless medium.
2. The method of Claim 2 further comprising:

(e) including in the parameters an optional Permission Probability (PP).
3. The method of Claim 1 further comprising:
(f) including in the parameters a set of flags indicating which Traffic Categories (TC) may compete for the CC_OPs.
4. The method of Claim 1 further comprising (g) estimating the number of STA contenders.
5. The method of Claim 2 further comprising;
(h) setting the number of slots or CC_OPS to the number of STA contenders.
6. The method of Claim 1 further comprising:
(i) adjusting the parameters to account for overhead CCI.
7. The method of Claim 1 further comprising:
(j) concatenating CCIs while setting the number of CC_OPs equal to the number of STA contenders in each CCI.
8. A method for optimally serving STAs on Wireless LANs using a Controlled Contention/Resource Reservation protocol of the IEEE
802.11e standard comprising:
(a) setting a counter Empty_CC to 0;
(b) estimating the number of contenders according to prior results for the CC/RR protocol and known traffic patterns;
(c) conducting a test to determine if the number of contenders is less than 1;
(d) determining Optimum CC_OPs and approximating the overhead as 1 or 2 slots;
(e) performing a test" CC_OPs< 1 whereby a "yes"
condition sets CC_OPs to +1 and a "no" condition transfers to step (f); and (f) conducting a test: Empty_CCI< Max_Empty_CCI, whereby a "no" condition ends the process and a "yes' condition returns the process to step (b).
9. The method of Claim 8 further comprising:
(g) setting CC_OPs = number of STA contenders + 1.
10. The method of Claim 8 further comprising:

(h) setting CC_OP = number of # of STA + 2.
11. The method of claim 8 further comprising (g) calculating a Permission Probability where: if contenders> max contenders, then Permission Probability = Max Cntndrs/Cntndrs and Cntndrs =
Max_Cntndrs; else a "no" condition setting a Permission Probability = 1; else leaving cntndrs as is ; and (h) resetting the Empty CCI to 0 and a "yes" condition incrementing the Empty_CCI counter.
12. Apparatus for optimally serving STAs on Wireless LANs using a Controlled Contention/Resource Reservation protocol of the IEEE
802.11e standard comprising:
(a) transmitting apparatus which transmits Contention Control (CC) frames initiating Controlled Contention Intervals (CCI) having a selected number of slotted intervals and providing feedback on successfully received Resource Reservations;
(b) receiving apparatus which receives Resource Reservations (RR) detailing bandwidth needs from STA

contenders during a specified time interval called the Controlled Contention Interval (CCI);
(c) installing apparatus which installs in each CC frame several parameters for contention control purposes; and (d) controlling apparatus which controls the several parameters to optimize efficient use of the wireless medium and reduce access delays and maintain bandwidth efficiency for RR frames contending for the wireless medium.
13. The apparatus of Claim 12 further comprising:
(e) selecting apparatus which includes in the parameters a number of slots or Controlled Contention Opportunities (CC_OP), a Permission Probability (PP) and a set of flags indicating which Traffic Categories (TC) may compete for the CC_OPs.
14. A system for optimally serving STAB on Wireless LANs using a Controlled Contention/Resource Reservation protocol of the IEEE
802.11e standard comprising:
(a) a plurality of stations air- linked to an access point as a basic service set for communication purposes;

(b) a hybrid coordinator coupled to the access point for performing access management bandwidth management including the allocation of station transmission opportunities and the initiation of controlled contention intervals among the stations;
(c) transmitting apparatus which transmits Contention Control (CC) frames initiating Controlled Contention Intervals (CCI) having a selected number of slotted intervals and providing feedback on successfully received Resource Reservations; and (d) receiving apparatus which receives Resource Reservations (RR) detailing bandwidth needs from STA
contenders during a specified time interval called the Controlled Contention Interval (CCI) for optimally serving the stations using a Controlled Contention /Resource Reservation protocol.
15. The system of Claim 14 further comprising:
e) selecting apparatus which includes in the parameters a number of slots or Controlled Contention Opportunities (CC_OP), a Permission Probability (PP) and a set of flags indicating which Traffic Categories (TC) may compete for the CC_OPs.
CA2464046A 2001-10-31 2002-10-28 Optimally serving stations on wlans using contention/reservation protocol 802.11e Expired - Fee Related CA2464046C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US33550401P 2001-10-31 2001-10-31
US60/335,504 2001-10-31
US10/230,116 2002-08-29
US10/230,116 US7289529B2 (en) 2001-10-31 2002-08-29 Method and system for optimally serving stations on wireless LANs using a controlled contention/resource reservation protocol of the IEEE 802.11e standard
PCT/US2002/036424 WO2003039035A2 (en) 2001-10-31 2002-10-28 Optimally serving stations on wlans using contention/reservation protocol 802.11e

Publications (2)

Publication Number Publication Date
CA2464046A1 true CA2464046A1 (en) 2003-05-08
CA2464046C CA2464046C (en) 2010-12-21

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US (2) US7289529B2 (en)
EP (1) EP1451947A4 (en)
JP (1) JP4022200B2 (en)
KR (1) KR100802974B1 (en)
AU (1) AU2002352674A1 (en)
CA (1) CA2464046C (en)
WO (1) WO2003039035A2 (en)

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KR20040060964A (en) 2004-07-06
WO2003039035A2 (en) 2003-05-08
US7289529B2 (en) 2007-10-30
JP4022200B2 (en) 2007-12-12
WO2003039035A3 (en) 2004-02-26
US20030161340A1 (en) 2003-08-28
AU2002352674A1 (en) 2003-05-12
EP1451947A4 (en) 2009-01-21
JP2005508119A (en) 2005-03-24
KR100802974B1 (en) 2008-02-14
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