Source: http://www.google.com/patents/US8122134?dq=5412717
Timestamp: 2014-07-11 15:34:37
Document Index: 653565900

Matched Legal Cases: ['art 15', 'art 15', 'art 15', 'art 15', 'art 16', 'art 16', 'art 16', 'application No. 200380101286', 'application No. 2003239577', 'art 16', 'art 11', 'art 11', 'art 11', 'art 16', 'application No. 200380105267', 'Application No. 03814391', 'Application No. 2004', 'application No. 200380101286', 'Application No. 200380101286', 'application No. 03734139', 'application No. 03759271', 'application No. 03759271', 'application No. 200380101286', 'application No. 200380101286', 'Application No. 200380101286', 'application No. 03814391']

Patent US8122134 - Reducing loop effects in a wireless local area network repeater - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA method and apparatus are provided for operating a frequency translating repeater in a wireless local are network (WLAN) having one or more repeaters (200, 204), a network protocol for communicating between one or more base units (100) and one or more client units (104, 105). A first frequency channel...http://www.google.com/patents/US8122134?utm_source=gb-gplus-sharePatent US8122134 - Reducing loop effects in a wireless local area network repeaterAdvanced Patent SearchPublication numberUS8122134 B2Publication typeGrantApplication numberUS 10/530,546PCT numberPCT/US2003/029117Publication dateFeb 21, 2012Filing dateOct 9, 2003Priority dateOct 11, 2002Also published asCN1703838A, CN100574119C, US20060041680, WO2004034600A1Publication number10530546, 530546, PCT/2003/29117, PCT/US/2003/029117, PCT/US/2003/29117, PCT/US/3/029117, PCT/US/3/29117, PCT/US2003/029117, PCT/US2003/29117, PCT/US2003029117, PCT/US200329117, PCT/US3/029117, PCT/US3/29117, PCT/US3029117, PCT/US329117, US 8122134 B2, US 8122134B2, US-B2-8122134, US8122134 B2, US8122134B2InventorsJames A. Proctor, Jr., Kenneth M. GaineyOriginal AssigneeQualcomm IncorporatedExport CitationBiBTeX, EndNote, RefManPatent Citations (101), Non-Patent Citations (40), Referenced by (4), Classifications (16), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetReducing loop effects in a wireless local area network repeaterUS 8122134 B2Abstract A method and apparatus are provided for operating a frequency translating repeater in a wireless local are network (WLAN) having one or more repeaters (200, 204), a network protocol for communicating between one or more base units (100) and one or more client units (104, 105). A first frequency channel may be used for receiving and transmitting, the network protocol defining multiple operating frequencies monitored to detect a transmitted signal. The signal is characterized to determine if associated with the base units. A second frequency channel selected for use by one of the repeaters for retransmission of additional signals based on the characterization.
What is claimed is: 1. A method for operating a repeater in a wireless local area network (WLAN) having one or more repeaters and a network protocol for communicating between one or more base units and one or more client units, the one or more base units and one or more client units receiving and transmitting on at least a first frequency channel, the network protocol defining multiple operating frequencies, the method comprising:
FIELD OF THE INVENTION The present invention relates generally to wireless local area networks (WLANs) and more specifically to reducing the likelihood of frequency contention and erroneous connection loops within a transmission environment with two or more WLAN repeaters.
BACKGROUND OF THE INVENTION Several standard protocols for wireless local area networks, commonly referred to as WLANs, are becoming popular. These include protocols such as 802.11 (as set forth in the 802.11 wireless standards), home RF, and Bluetooth. The standard wireless protocol with the most commercial success to date is the 802.11b protocol although successors such as next generation protocols, such as 802.11g, are also gaining popularity.
SUMMARY OF THE INVENTION Thus a method and apparatus for handling the above described problems in a wireless local area network (WLAN) are described, wherein in accordance with one exemplary embodiment, the WLAN includes a base unit connected to a wide area network. The base unit communicates with at least one client unit using a protocol requiring the base unit and the at least one client unit to receive and transmit information on a same frequency channel chosen from at least two available frequency channels, such as in accordance with an 802.11, or the like protocol. The base unit preferably identifies which of multiple operating frequencies is chosen in a control parameter transmitted in a protocol message associated with the protocol.
In accordance with another exemplary embodiment, an active monitoring approach may be used as safeguard against repeater or node interaction. In active monitoring, after channels have been �pre-selected�, an exemplary repeater may transmit a signal, such as a test signal, on a repeater channel where no apparent activity is present. The AP channel or other channel of interest, such as a proximate channel where there would be a likelihood of a false connection loop, would then be monitored for activity corresponding to the transmission to determine whether returned transmissions are present from, for example, a false connection loop, which may be likely to cause system level issues. An exemplary repeater in accordance with an active monitoring approach preferably continues to monitor the AP channel and the repeater channel for a clear channel assessment and a determination that WLAN rules are being complied with prior to transmission on the repeated channel to prevent any collision of signals on the AP channel, repeater channel, channel of interest or the like. It should be noted that the signal generated by the repeater to accomplish exemplary active monitoring methods may be any signal compliant with part 15.247 or part 15.407 of F.C.C. rules, or the rules of the WLAN system the repeater is operating within, including, for example, a spread spectrum or frequency hopped signal, and may even include pulses, impulses, wide band signals, or the like including generic broad band or band limited noise. It will be appreciated that one benefit of using such signals may include being better able to characterize the WLAN communication environment and the interference potential of adjacent nodes within the repeater environment described in connection with the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a wireless network environment including two exemplary repeaters.
Rather, in accordance with various exemplary and preferred exemplary embodiments, the channel of operation identified in the beacon from AP 100 is the channel to be used after frequency translation occurs in repeater 200, which will be referred to hereinafter as frequency translating repeater 200. Repeater 200 may further be capable of receiving a beacon from AP 100, modifying the contents of the beacon with the correct channel number in the DS parameter set segment of the beacon and retransmitting the modified beacon. It should be noted that such operation allows use of 802.11 protocols with no modifications to APs, client devices, or other nodes since the �spoofed� parameter is handled by nodes in a normal fashion. The original beacon transmitted from AP 100 containing the incorrect channel number will be ignored by client devices after being directed to the new translated channel number contained in the beacon having the spoofed DS parameter. It should be apparent to one of ordinary skill in the art how to transmit the signals on the frequencies described herein according to the protocols set forth, and, further, the DS parameter may be reset easily by modifying its channel set value, in accordance with for example, IEEE 802.11, Paragraph 7.3.2.4 �DS Parameter Set Element�.
In accordance with various exemplary and alternative exemplary embodiments, AP 100 may use an IEEE 802.11b or IEEE 802.11g modulation compliant waveform, but transmits signals on a non standard-conforming band, such as on a different band from one defined as appropriate by the IEEE 802.11a standard. A frequency translating repeater 200, 204 may thus converts an exemplary IEEE 802.11b or IEEE 802.11g modulated packet from the �a� band on one channel to the �b� band on another channel where it is utilized by a station device such as client unit 105. When signals return from a station, such as client unit 104 or 105 to AP 100, client units 104 or 105 may preferably transmit the standard 802.11b compliant signal in the appropriate band, such as defined in the standard, repeater 200 detects the 802.11b signal and translates it in accordance with frequency channels defined in the 802.11a standard, but in conflict with, for example, the channel of operation, if present, in the DS parameter set message.
It should be noted that in accordance with various exemplary and alternative exemplary embodiments, for example as illustrated in FIG. 1, a �Backhaul� channel may refer to the channel with the incorrect DS Parameter set message and a translating repeater may be referred to as �off-ramp� repeater 204. FIG. 1 further shows �hi-way� repeater 200 and �off-ramp� repeater 204 with three distinct channels of operation: channel 201 between AP 100 and hi-way repeater 200, interim channel or �off-ramp� channel 202 between hi-way repeater 200 and off-ramp repeater 204, and local channel 203 between off-ramp repeater 204 and client unit 105.
Choosing or �pre-selecting� a repeater channel in accordance with preferred exemplary embodiments prevents two repeaters from operating on the same pair of channels. Moreover, by defining �known� or preferred channel spacing and by defining and applying usage rules, depending on which channel or channels are available for re-transmission, and which are active with transmissions that qualify as AP transmissions, channel infringement may further be avoided. It should be noted that usage rules in accordance with various exemplary embodiments may include for example, rule set A) always incrementing by two or another predefined defined number of channels from the AP channel, unless no valid channels exist, decrementing 3 channels or another predefined number of channels, if no valid channels exist; rule set B) defining a one to one valid channel mapping based on a table, mathematical equation, or other suitable method wherein every valid AP-like channel is assigned or otherwise associated with valid repeater channels and where the defined repeater channels and AP-like channel would not overlap with a repeater who is sending an AP-like signal.
Referring now to FIG. 5, a flow chart is shown illustrating various exemplary techniques which might be associated with for example, an exemplary state machine for initial channel selection in an exemplary active approach. It should be recognized that active channel selection may preferably be performed after passive selection of the AP channel and pre-selection of the repeater channel, as an additional step to further mitigate against the effects of feedback. Alternatively, a channel could be pre-selected based on other factors, or could be randomly selected for active testing. In accordance with various preferred exemplary embodiments, a pre-selected repeater channel may be paired with a detected AP channel, and information identifying the pre-selected repeater channel stored in a storage device or the like as in 602. An exemplary repeater may then perform a distributed coordination function procedure, or the like, for example, as defined in the IEBE 802.11 MAC specification in 603�to prevent jamming other users.
If a transmission is detected on the AP-link channel with the same signal parameters at 605, the AP-like signal may be defined to be a repeater signal operating on the same two channels. It should be noted that a match of the paired signals may preferably be determined based on signal parameters which may include duration, amplitude or power modulations, on/off packet times, and inter transmission intervals in situations wherein more than one transmission is sent, or the like. The matched pair of frequencies are preferably stored in a table which may be referred to as, for example, a �known repeater table� at 607. A test may be performed at 609 to determine whether other repeater channels are available, and, if so, the pre-selected repeater channel may be disqualified as valid for use, and another channel selected as a pre-selected repeater channel at 611 whereupon an exemplary process may return, for example, to 603. It should be noted that the above test transmission process, may further be performed on different channels, as derived from the AP and interference tables at 608 until no correlated or matching transmissions are detected on the AP-like paired channel. It should be noted that if no repeater activity is detected at 605 the pre-selected repeater channel is defined as valid for use as a repeater channel, and the repeater may be enabled for normal operation.
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No. 12/439,018, citing WO01052447 and US2004/0208258, Dated Nov. 15, 2010.40Translation of Office Action issued by Chinese Patent Office on Oct. 19, 2007 in connection with the corresponding Chinese application No. 03814391,7.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8468236 *Nov 27, 2007Jun 18, 2013Sercomm CorporationSystems and methods for providing frequency diversity in security transmittersUS8649418Feb 8, 2013Feb 11, 2014CBF Networks, Inc.Enhancement of the channel propagation matrix order and rank for a wireless channelUS20060063484 *Oct 24, 2003Mar 23, 2006Proctor James A JrWireless local area network repeater with in-band control channelUS20100049799 *Nov 27, 2007Feb 25, 2010Sequel Technologies, Llc.Systems and methods for providing frequency diversity in security transmitters* Cited by examinerClassifications U.S. Classification709/228, 709/224, 370/341, 370/315International ClassificationH04L12/56, G06F15/16, H04L12/28, H04B7/14Cooperative ClassificationH04W84/047, H04B7/15578, H04W16/26, H04W84/12, H04B7/15542European ClassificationH04W16/26, H04B7/155F2, H04W84/04C4Legal EventsDateCodeEventDescriptionJan 2, 2008ASAssignmentOwner name: QUALCOMM INCORPORATED, CALIFORNIAFree format text: NUNC PRO TUNC ASSIGNMENT EFFECTIVE AS OF OCTOBER 26, 2007;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:020317/0300Effective date: 20071220Owner name: QUALCOMM INCORPORATED,CALIFORNIAFree format text: NUNC PRO TUNC ASSIGNMENT EFFECTIVE AS OF OCTOBER 26, 2007;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:20317/300Nov 29, 2007ASAssignmentOwner name: QUALCOMM INCORPORATED, CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:020177/0065Effective date: 20071026Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:20177/65Owner name: QUALCOMM INCORPORATED,CALIFORNIAOct 26, 2007ASAssignmentOwner name: SQUARE 1 BANK, NORTH CAROLINAFree format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:020064/0042Effective date: 20071026May 29, 2007ASAssignmentOwner name: SQUARE 1 BANK, NORTH CAROLINAFree format text: SECURITY AGREEMENT;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:019448/0201Effective date: 20060919Oct 20, 2005ASAssignmentOwner name: WIDEFI, INC., FLORIDAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PROCTOR, JAMES A., JR.;GAINEY, KENNETH M.;REEL/FRAME:017112/0279Effective date: 20050407RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google