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    AUTOMATIC SEAMLESS VERTICAL ROAMING BETWEEN WLANS WWANS
    11.
    发明专利
    AUTOMATIC SEAMLESS VERTICAL ROAMING BETWEEN WLANS WWANS 未知

    公开(公告)号：CA2398185C

    公开(公告)日：2013-01-22

    申请号：CA2398185

    申请日：2001-12-27

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ

    IPC: H04W8/02 ,  H04L12/28 ,  H04L12/56 ,  H04W36/14 ,  H04W88/06

    Abstract: A Mobile Station (MS) is able to vertically roam in either direction between two different network, i.e. WWAN and WLAN. The MS is equipped with a dual mode Radio for WWAN and WLAN transmissions. The WLAN Radio is linked to a WLAN Enterprise Gateway Controller (EGC) via a first air link and the WWAN Radio is linked to a WWAN Base Transceiver Station (BTS) via a second air link. The EGC is connected to a Mobile Switching Center (MSC) which is in turn connected to the BTS. An outgoing VoIP call from the WLAN Radio to a remote party on the WWAN will transition or seamlessly switch over to a WWAN connection when the MS detects packet error rates, frequent scale back or consistent signal degradation. Upon such conditions, the WLAN Radio requests the EGC to request an Explicit Call Transfer via the MSC to the MS integrated WWAN Radio portion which automatically accepts the call based on referenced information stored in the user's subscriber identification module (SIM). Once the WWAN Radio is confirmed connected to the remote party on the WWAN, the WLAN Radio drops the WLAN connection. An incoming call between the MS and a remote user via the WWAN will transition to the WLAN Radio when the MS enters WLAN coverage. The MS issues an ECT to the WLAN. After user verification by the WLAN Radio and the EGC signals acceptance of the call, the WWAN Radio connection is dropped and the call is now established between the WLAN Radio and the remote party on the WWAN.

    12.
    发明专利
    未知

    公开(公告)号：DE60131717T2

    公开(公告)日：2008-11-20

    申请号：DE60131717

    申请日：2001-09-17

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ

    IPC: H04L12/28 ,  H04B7/26 ,  H04L12/56 ,  H04L29/06 ,  H04M1/725 ,  H04W16/00 ,  H04W72/08 ,  H04W84/12 ,  H04W84/18 ,  H04W88/04 ,  H04W88/06

    Abstract: A dual mode mobile unit is arranged to communicate in either a first or second data communications standard, such as combined Bluetooth and 802.11 operation. An interface unit converts received Bluetooth or 802.11 format signals into 802.11 frame format data signals to be provided to a digital signal processor which is programmed to process signals in either standard. The dual mode mobile unit can operate in the 802.11 standard to reserve a time interval for Bluetooth activity during which other 802.11 units will avoid transmissions to avoid interference.

    13.
    发明专利
    未知

    公开(公告)号：AT385317T

    公开(公告)日：2008-02-15

    申请号：AT05725799

    申请日：2005-03-16

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ ,  DURON MARK WILLIAM ,  STRZELCZYK MARTIN J

    IPC: G01S19/11 ,  G01S5/14 ,  G01S13/74 ,  G01S13/87 ,  G06K7/00 ,  G06K19/077

    Abstract: A multi-resolution object location system and method for locating objects is provided. The multi-resolution system and method uses a long-range object locator together with a more precise RFID locator to efficiently and accurately determine the location of objects that include an RFID tag. The long-range object locator has a relatively longer range and can cover a relatively large area to determine the general location of the object within the large area. The RFID locator has a relatively shorter range, but is able to locate the object more precisely. The object location system uses the long-range locator to first determine the general location of the object, and then the RFID locator is used to determine a more accurate location of the object. Thus, the multi-resolution object location system is able to provide both a long range location of objects over a large area and a precise location of objects.

    14.
    发明专利
    未知

    公开(公告)号：AT380421T

    公开(公告)日：2007-12-15

    申请号：AT01122240

    申请日：2001-09-17

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ

    IPC: H04L12/28 ,  H04B7/26 ,  H04L12/56 ,  H04L29/06 ,  H04M1/725 ,  H04W16/00 ,  H04W72/08 ,  H04W84/12 ,  H04W84/18 ,  H04W88/04 ,  H04W88/06

    Abstract: A dual mode mobile unit is arranged to communicate in either a first or second data communications standard, such as combined Bluetooth and 802.11 operation. An interface unit converts received Bluetooth or 802.11 format signals into 802.11 frame format data signals to be provided to a digital signal processor which is programmed to process signals in either standard. The dual mode mobile unit can operate in the 802.11 standard to reserve a time interval for Bluetooth activity during which other 802.11 units will avoid transmissions to avoid interference.

    Object location system and method using RFID
    18.
    发明专利
    Object location system and method using RFID 未知

    公开(公告)号：AU2005218459A1

    公开(公告)日：2005-09-15

    申请号：AU2005218459

    申请日：2005-02-25

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： STRZELCZYK MARTIN J ,  DURON MARK WILLIAM ,  BRIDGELALL RAJ

    IPC: G01S13/34 ,  G01S13/32 ,  G01S13/87

    Abstract: A system and method is provided for locating objects using RFID tags. The system and method uses an RFID reader and a distance calculator to efficiently and accurately determine the location of objects that include an RFID tag. The RFID reader transmits a plurality of signals to the RFID tag, with the plurality of signals having different fundamental frequencies. In response, the RFID tag backscatter modulates the plurality of transmitted signals to create a plurality of backscatter modulated signals. The RFID reader receives and demodulates the plurality of backscatter modulated signals. The distance calculator determines the phase of the plurality of backscatter modulated signals and determines a rate of change of the phase in the backscatter modulated signals with respect to the rate of change in the fundamental frequency of the transmitted signals and uses this information to calculate the distance to the RFID tag.

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