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Patent US8005055 - Method and apparatus for determining and managing congestion in a wireless ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn improved method of network management, particularly in the context of standards IEEE802.11 and IEEE802.11k, through two new MAC measurements, with attendant advantages. The two new measurements include WTRU uplink traffic loading measurement, and an AP service loading measurement and is generally...http://www.google.com/patents/US8005055?utm_source=gb-gplus-sharePatent US8005055 - Method and apparatus for determining and managing congestion in a wireless communications systemAdvanced Patent SearchPublication numberUS8005055 B2Publication typeGrantApplication numberUS 10/939,785Publication dateAug 23, 2011Filing dateSep 13, 2004Priority dateJul 23, 2003Also published asCA2580311A1, CN2914503Y, CN101390412A, CN101390412B, CN103327574A, CN103369589A, DE202005014458U1, EP1792504A2, EP1792504A4, EP1792504B1, EP2259630A2, EP2259630A3, US20050157676, US20110305139, WO2006031834A2, WO2006031834A3Publication number10939785, 939785, US 8005055 B2, US 8005055B2, US-B2-8005055, US8005055 B2, US8005055B2InventorsJoseph A. Kwak, Angelo Cuffaro, Paul Marinier, Christopher Cave, Frank La Sita, Ahmed Ali, Vincent Roy, Athmane Touag, Marian Rudolf, Teresa Joanne Hunkeler, Shamim Akbar RahmanOriginal AssigneeInterdigital Technology CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (80), Non-Patent Citations (46), Referenced by (12), Classifications (25), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for determining and managing congestion in a wireless communications systemUS 8005055 B2Abstract An improved method of network management, particularly in the context of standards IEEE802.11 and IEEE802.11k, through two new MAC measurements, with attendant advantages. The two new measurements include WTRU uplink traffic loading measurement, and an AP service loading measurement and is generally applicable at least to layers 1 and 2 as applied to a least 802.11k in the context of OFDM and CDMA 2000 systems, but is applicable to other scenarios as well. A Method for determining and advertising congestion is also provided for a Wireless Local Area Network (WLAN) system. The present invention also introduces a method for managing congestion when congestion is detected. This aspect of the present invention applies primarily to wireless systems that use the Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) mechanism. The methods are advantageously implemented in selectively configured WTRUs of various forms.
CROSS REFERENCE TO RELATED APPLICATIONS This application is a continuation-in-part of U.S. patent application Ser. No. 10/897,771 filed Jul. 23, 2004, which in turn claims priority from both U.S. provisional application 60/489,385 filed on Jul. 23, 2003, and U.S. provisional application 60/552,537 filed on Mar. 12, 2004, which are incorporated by reference as if fully set forth.
FIELD OF THE INVENTION The present invention is related to the field of wireless communications. More specifically, the present invention relates to Wireless Local Area Network (WLAN) systems that use a Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) mechanism and provides means for determining and managing congestion and further enhances network management by providing novel medium access control (MAC) measurements in wireless communications.
SUMMARY The present invention provides a method for determining and advertising congestion in a wireless local area network (WLAN) system. The present invention also provides a method for managing congestion when congestion is detected. One aspect of the present invention applies to wireless systems that use CSMA/CA. Preferably, several metrics are used to determine congestion including: average duration of backoff procedure, in-Basic Service Set (in-BSS) deferral rate, out-of-BSS deferral rate, number of associated stations, mean WTRU channel utilization, and average buffer Medium Access Control (MAC) occupancy. Actions taken to relieve congestion preferably include; sorting the set of WTRUs in order of most wasted time spent trying to transmit acknowledged/unacknowledged packets, and disassociating each WTRU one at a time until the congestion is relieved.
BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is an overview diagram of a conventional IEEE802.11 WLANs with their corresponding components.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone (without the other features and elements of the preferred embodiments) or in various combinations with or without other features and elements of the present invention.
wasted_txtimeSTA=(12000/11e6)+(12000/11e6+640.0)+(12000/11e6+1280.0)+(12000/5.5e6+2560.0)+(12000/5.5e6+5120.0)+(12000/5.5e6+10240.0)+(8000/11e6)+(8000/11e6+640.0)+(8000/11e6+1280.0)=33.76 ms Preferably, the WTRUs are sorted from greatest to smallest times at step S7-4. The program then advances to step S8. At step S8 (FIG. 2), each STA from the sorted list is disassociated greatest time first, until the congestion is relieved.
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