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    5.
    发明专利
    未知

    公开(公告)号：AT446657T

    公开(公告)日：2009-11-15

    申请号：AT06814374

    申请日：2006-09-11

    Applicant: CISCO TECH INC

    Inventor： HART BRIAN

    IPC: H04W16/32 ,  H04L12/28 ,  H04W16/20 ,  H04W84/12

    Abstract: Methods, apparatuses and systems directed to partitioning access points into two or more network access layers, such as overlay and underlay network access layers. According to one implementation of the present invention, a wireless network management system partitions a set of wireless access points into an overlay network for low-functionality clients and an underlay network for high-functionality clients. As described in further detail below, each of the overlay and underlay networks provides a class of network service, where each class of network service differs relative to at least one attribute (e.g., type of 802.11 access, data rates, High-Density, Quality-of-Service, encryption, compression, etc.). For didactic purposes, the overlay network is also referred to as the overlay network service layer (NSL) and the underlay network is referred to as the underlay NSL. In one implementation of the present invention, a partitioning algorithm is used to partition wireless access points into overlay and underlay networks. As described in further detail below, the partitioning algorithm, in one implementation, automatically assigns access points to the overlay and underlay networks based on the coverage needs of each network and the coverage parameters of each access point. In one implementation, the partitioning algorithm can be configured such that the overlay network provides maximum coverage for low-functionality clients, and the underlay network enables maximum performance for high-functionality clients.

    ERROR VECTOR MAGNITUDE SELECTION DIVERSITY METRIC FOR OFDM
    6.
    发明专利
    ERROR VECTOR MAGNITUDE SELECTION DIVERSITY METRIC FOR OFDM 未知

    公开(公告)号：CA2542147C

    公开(公告)日：2011-02-22

    申请号：CA2542147

    申请日：2004-07-09

    Applicant: CISCO TECH INC

    Inventor： LYONS DANIEL JOSEPH ,  HART BRIAN

    IPC: H04B1/06 ,  H04B7/00 ,  H04B7/06 ,  H04B7/08 ,  H04B17/00

    Abstract: Described herein is an apparatus for inclusion in a station of a wireless network, and a method implemented in a station of a wireless network. The method includes wirelessly receiving data via each of a plurality of antennas (703and 705), the data corresponding to a packet of information transmitted from a remote station, sampling the received data corresponding to the received packet to form data samples for each of the antennas, and determining a measure of signal quality from samples of the received data for each of the antennas. The method further includes selecting (1003) one of the plurality of receive antennas as the antenna for receiving from the remote station according to the determined measure of signal quality.

    7.
    发明专利
    未知

    公开(公告)号：AT452519T

    公开(公告)日：2010-01-15

    申请号：AT06800898

    申请日：2006-08-07

    Applicant: CISCO TECH INC

    Inventor： HART BRIAN ,  DOUGLAS BRETTON ,  QIAN LU

    IPC: H04W16/18

    Abstract: Described herein are a computer-implemented method of determining a power plan/frequency plan combination assigning transmit frequency channels and transmit powers for a plurality of managed access points (APs) of a wireless network. Also described herein is a carrier medium carrying computer readable code configured to cause one or more processors of a processing system to implement the computer implemented method of determining a power plan/frequency plan combination. The method includes determining candidate power plans for the access points, including determining candidate transmit powers for the access points, determining a candidate frequency plan corresponding to each of the determined candidate power plans using a frequency plan determining method to determine a set of candidate power plan/frequency plan combinations, and rating each combination of a candidate power plan and candidate frequency plan according to an evaluation criterion, and selecting a preliminary power plan/frequency plan combination based on the rating. One embodiment of the method further includes determining a final power plan for the preliminary frequency plan of the preliminary power plan/frequency plan combination to obtain a final power plan/frequency plan combination.

    Error vector magnitude selection diversity metric for OFDM
    8.
    发明专利
    Error vector magnitude selection diversity metric for OFDM 未知

    公开(公告)号：AU2004307920B2

    公开(公告)日：2009-06-25

    申请号：AU2004307920

    申请日：2004-07-09

    Applicant: CISCO TECH INC

    Inventor： HART BRIAN ,  LYONS DANIEL JOSEPH

    IPC: H04B7/06 ,  H04B7/08 ,  H04B17/00

    Abstract: Described herein is an apparatus for inclusion in a station of a wireless network, and a method implemented in a station of a wireless network. The method includes wirelessly receiving data via each of a plurality of antennas, the data corresponding to a packet of information transmitted from a remote station, sampling the received data corresponding to the received packet to form data samples for each of the antennas, and determining a measure of signal quality from samples of the received data for each of the antennas. The method further includes selecting one of the plurality of receive antennas as the antenna for receiving from the remote station according to the determined measure of signal quality.

    9.
    发明专利
    未知

    公开(公告)号：AT523054T

    公开(公告)日：2011-09-15

    申请号：AT09714792

    申请日：2009-02-02

    Applicant: CISCO TECH INC

    Inventor： HART BRIAN

    IPC: H04W64/00

    Abstract: A technique is provided to enable a ranging-enhanced communication device that operates according to a legacy communication protocol to transmit a ranging waveform that is not defined in, or part of, the rules of the legacy communication protocol. In one embodiment, a ranging-enhanced communication device that is to transmit the ranging waveform generates information representing a time interval within which to wirelessly transmit a ranging waveform that is not defined by a legacy communication protocol. This information is encoded into a field of a frame that is formatted according to the legacy communication protocol to protect the time interval from transmissions by legacy communication devices that operate according to the legacy communication protocol. The ranging-enhanced communication device transmits the frame and transmits the ranging waveform during the time interval following the frame.

    MULTIPLE ANTENNA PROCESSING ON TRANSMIT FOR WIRELESS LOCAL AREA NETWORKS
    10.
    发明专利
    MULTIPLE ANTENNA PROCESSING ON TRANSMIT FOR WIRELESS LOCAL AREA NETWORKS 未知

    公开(公告)号：CA2583111A1

    公开(公告)日：2006-04-13

    申请号：CA2583111

    申请日：2005-08-23

    Applicant: CISCO TECH INC

    Inventor： DOUGLAS BRETTON LEE ,  HART BRIAN ,  PERAHIA ELDAD ,  LYONS DANIEL JOSEPH

    IPC: H04B17/00

    Abstract: A method and an apparatus in a first wireless station of a network transmitting to a second wireless station. The network uses multi-tone OFDM signals. The first station includes multiple antennas and a receive and a transmit signal path per antenna. Each receive signal path includes a discrete Fourier transformer determining the tones in a received signal, and each transmit signal path includes an inverse discrete Fourier transformer converting tones to a signal. The method includes determining channel estimates for each tone and each receive path while receiving from the second station, determining transmit weights to transmit to the second station, tone-by-tone weighting a signal for transmission to the second station to produce weighted tone sets for each transmit signal path, and transmitting the weighted tone sets. The first station is configured so that the weighting produces additive beamforming without the second station needing multiple antennas.

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